Patchwork [Xen-devel] compound skb frag pages appearing in start_xmit

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Submitter Ian Campbell
Date Oct. 10, 2012, 1:09 p.m.
Message ID <1349874598.10070.39.camel@zakaz.uk.xensource.com>
Download mbox | patch
Permalink /patch/190638/
State RFC
Delegated to: David Miller
Headers show

Comments

Ian Campbell - Oct. 10, 2012, 1:09 p.m.
On Wed, 2012-10-10 at 11:13 +0100, Ian Campbell wrote:
> I haven't tackled netfront yet. 

I seem to be totally unable to reproduce the equivalent issue on the
netfront xmit side, even though it seems like the loop in
xennet_make_frags ought to be obviously susceptible to it.

Konrad, Sander, are either of you able to repro, e.g. with:


My repro for netback was just to netcat a wodge of data from dom0->domU
but going the other way doesn't seem to trigger.

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Sander Eikelenboom - Oct. 10, 2012, 2:49 p.m.
Wednesday, October 10, 2012, 3:09:58 PM, you wrote:

> On Wed, 2012-10-10 at 11:13 +0100, Ian Campbell wrote:
>> I haven't tackled netfront yet. 

> I seem to be totally unable to reproduce the equivalent issue on the
> netfront xmit side, even though it seems like the loop in
> xennet_make_frags ought to be obviously susceptible to it.

> Konrad, Sander, are either of you able to repro, e.g. with:


Hmrrrmm i don't see any traces, only strange behaviour ..

- i can connect to guests by ssh, but it's sluggish, and sometimes stops working
- The guest seem to keep trying to connect to netback:

[  658.276719] xen_bridge: port 2(vif40.0) entered forwarding state
[  658.282258] xen_bridge: port 2(vif40.0) entered forwarding state
[  663.945964] xen_bridge: port 7(vif39.0) entered forwarding state
[  669.674277] xen_bridge: port 2(vif40.0) entered disabled state
[  669.680290] device vif40.0 left promiscuous mode
[  669.685464] xen_bridge: port 2(vif40.0) entered disabled state
[  672.857222] device vif41.0 entered promiscuous mode
[  673.166254] xen-blkback:ring-ref 8, event-channel 9, protocol 1 (x86_64-abi)
[  673.176368] xen_bridge: port 2(vif41.0) entered forwarding state
[  673.182042] xen_bridge: port 2(vif41.0) entered forwarding state
[  674.439725] xen_bridge: port 7(vif39.0) entered disabled state
[  674.445708] device vif39.0 left promiscuous mode
[  674.450955] xen_bridge: port 7(vif39.0) entered disabled state
[  677.726040] device vif42.0 entered promiscuous mode
[  678.053381] xen-blkback:ring-ref 8, event-channel 9, protocol 1 (x86_64-abi)
[  678.062804] xen_bridge: port 7(vif42.0) entered forwarding state
[  678.068433] xen_bridge: port 7(vif42.0) entered forwarding state
[  688.224736] xen_bridge: port 2(vif41.0) entered forwarding state
[  693.080557] xen_bridge: port 7(vif42.0) entered forwarding state
[  700.786276] xen_bridge: port 7(vif42.0) entered disabled state
[  700.792484] device vif42.0 left promiscuous mode
[  700.802409] xen_bridge: port 7(vif42.0) entered disabled state
[  704.133606] device vif43.0 entered promiscuous mode
[  704.460160] xen-blkback:ring-ref 8, event-channel 9, protocol 1 (x86_64-abi)
[  704.469800] xen_bridge: port 7(vif43.0) entered forwarding state
[  704.475303] xen_bridge: port 7(vif43.0) entered forwarding state
[  719.493788] xen_bridge: port 7(vif43.0) entered forwarding state
[  726.302456] xen_bridge: port 7(vif43.0) entered disabled state
[  726.308898] device vif43.0 left promiscuous mode
[  726.314029] xen_bridge: port 7(vif43.0) entered disabled state

All the guests are already up, but this keeps on going and going and going ....



> diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
> index b06ef81..8a3f770 100644
> --- a/drivers/net/xen-netfront.c
> +++ b/drivers/net/xen-netfront.c
> @@ -462,6 +462,8 @@ static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev,
>                 ref = gnttab_claim_grant_reference(&np->gref_tx_head);
>                 BUG_ON((signed short)ref < 0);
>  
> +               BUG_ON(PageCompound(skb_frag_page(frag)));
> +
>                 mfn = pfn_to_mfn(page_to_pfn(skb_frag_page(frag)));
>                 gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id,
>                                                 mfn, GNTMAP_readonly);

> My repro for netback was just to netcat a wodge of data from dom0->domU
> but going the other way doesn't seem to trigger.



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Ian Campbell - Oct. 11, 2012, 8:02 a.m.
On Wed, 2012-10-10 at 15:49 +0100, Sander Eikelenboom wrote:
> Wednesday, October 10, 2012, 3:09:58 PM, you wrote:
> 
> > On Wed, 2012-10-10 at 11:13 +0100, Ian Campbell wrote:
> >> I haven't tackled netfront yet. 
> 
> > I seem to be totally unable to reproduce the equivalent issue on the
> > netfront xmit side, even though it seems like the loop in
> > xennet_make_frags ought to be obviously susceptible to it.
> 
> > Konrad, Sander, are either of you able to repro, e.g. with:
> 
> 
> Hmrrrmm i don't see any traces, only strange behaviour ..
> 
> - i can connect to guests by ssh, but it's sluggish, and sometimes stops working

I saw something like this (ssh sluggish) even with dom0 itself. I'm
trying to see if I can characterise it enough to reliably bisect it.

I already switched out xen-unstable for 4.2-testing but that didn't make
any difference.

> - The guest seem to keep trying to connect to netback:
> 
> [  658.276719] xen_bridge: port 2(vif40.0) entered forwarding state
> [  658.282258] xen_bridge: port 2(vif40.0) entered forwarding state
> [  663.945964] xen_bridge: port 7(vif39.0) entered forwarding state
> [  669.674277] xen_bridge: port 2(vif40.0) entered disabled state
> [  669.680290] device vif40.0 left promiscuous mode
> [  669.685464] xen_bridge: port 2(vif40.0) entered disabled state
> [  672.857222] device vif41.0 entered promiscuous mode
> [  673.166254] xen-blkback:ring-ref 8, event-channel 9, protocol 1 (x86_64-abi)
> [  673.176368] xen_bridge: port 2(vif41.0) entered forwarding state
> [  673.182042] xen_bridge: port 2(vif41.0) entered forwarding state
> [  674.439725] xen_bridge: port 7(vif39.0) entered disabled state
> [  674.445708] device vif39.0 left promiscuous mode
> [  674.450955] xen_bridge: port 7(vif39.0) entered disabled state
> [  677.726040] device vif42.0 entered promiscuous mode
> [  678.053381] xen-blkback:ring-ref 8, event-channel 9, protocol 1 (x86_64-abi)
> [  678.062804] xen_bridge: port 7(vif42.0) entered forwarding state
> [  678.068433] xen_bridge: port 7(vif42.0) entered forwarding state
> [  688.224736] xen_bridge: port 2(vif41.0) entered forwarding state
> [  693.080557] xen_bridge: port 7(vif42.0) entered forwarding state
> [  700.786276] xen_bridge: port 7(vif42.0) entered disabled state
> [  700.792484] device vif42.0 left promiscuous mode
> [  700.802409] xen_bridge: port 7(vif42.0) entered disabled state
> [  704.133606] device vif43.0 entered promiscuous mode
> [  704.460160] xen-blkback:ring-ref 8, event-channel 9, protocol 1 (x86_64-abi)
> [  704.469800] xen_bridge: port 7(vif43.0) entered forwarding state
> [  704.475303] xen_bridge: port 7(vif43.0) entered forwarding state
> [  719.493788] xen_bridge: port 7(vif43.0) entered forwarding state
> [  726.302456] xen_bridge: port 7(vif43.0) entered disabled state
> [  726.308898] device vif43.0 left promiscuous mode
> [  726.314029] xen_bridge: port 7(vif43.0) entered disabled state
> 
> All the guests are already up, but this keeps on going and going and going ....

The domain number seems to be climbing, are you sure something isn't
(crashing and) restarting?

> > diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
> > index b06ef81..8a3f770 100644
> > --- a/drivers/net/xen-netfront.c
> > +++ b/drivers/net/xen-netfront.c
> > @@ -462,6 +462,8 @@ static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev,
> >                 ref = gnttab_claim_grant_reference(&np->gref_tx_head);
> >                 BUG_ON((signed short)ref < 0);
> >  
> > +               BUG_ON(PageCompound(skb_frag_page(frag)));
> > +
> >                 mfn = pfn_to_mfn(page_to_pfn(skb_frag_page(frag)));
> >                 gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id,
> >                                                 mfn, GNTMAP_readonly);
> 
> > My repro for netback was just to netcat a wodge of data from dom0->domU
> > but going the other way doesn't seem to trigger.
> 
> 
> 


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Sander Eikelenboom - Oct. 11, 2012, 10 a.m.
Thursday, October 11, 2012, 10:02:26 AM, you wrote:

> On Wed, 2012-10-10 at 15:49 +0100, Sander Eikelenboom wrote:
>> Wednesday, October 10, 2012, 3:09:58 PM, you wrote:
>> 
>> > On Wed, 2012-10-10 at 11:13 +0100, Ian Campbell wrote:
>> >> I haven't tackled netfront yet. 
>> 
>> > I seem to be totally unable to reproduce the equivalent issue on the
>> > netfront xmit side, even though it seems like the loop in
>> > xennet_make_frags ought to be obviously susceptible to it.
>> 
>> > Konrad, Sander, are either of you able to repro, e.g. with:
>> 
>> 
>> Hmrrrmm i don't see any traces, only strange behaviour ..
>> 
>> - i can connect to guests by ssh, but it's sluggish, and sometimes stops working

> I saw something like this (ssh sluggish) even with dom0 itself. I'm
> trying to see if I can characterise it enough to reliably bisect it.

> I already switched out xen-unstable for 4.2-testing but that didn't make
> any difference.



>> - The guest seem to keep trying to connect to netback:
>> 
>> [  658.276719] xen_bridge: port 2(vif40.0) entered forwarding state
>> [  658.282258] xen_bridge: port 2(vif40.0) entered forwarding state
>> [  663.945964] xen_bridge: port 7(vif39.0) entered forwarding state
>> [  669.674277] xen_bridge: port 2(vif40.0) entered disabled state
>> [  669.680290] device vif40.0 left promiscuous mode
>> [  669.685464] xen_bridge: port 2(vif40.0) entered disabled state
>> [  672.857222] device vif41.0 entered promiscuous mode
>> [  673.166254] xen-blkback:ring-ref 8, event-channel 9, protocol 1 (x86_64-abi)
>> [  673.176368] xen_bridge: port 2(vif41.0) entered forwarding state
>> [  673.182042] xen_bridge: port 2(vif41.0) entered forwarding state
>> [  674.439725] xen_bridge: port 7(vif39.0) entered disabled state
>> [  674.445708] device vif39.0 left promiscuous mode
>> [  674.450955] xen_bridge: port 7(vif39.0) entered disabled state
>> [  677.726040] device vif42.0 entered promiscuous mode
>> [  678.053381] xen-blkback:ring-ref 8, event-channel 9, protocol 1 (x86_64-abi)
>> [  678.062804] xen_bridge: port 7(vif42.0) entered forwarding state
>> [  678.068433] xen_bridge: port 7(vif42.0) entered forwarding state
>> [  688.224736] xen_bridge: port 2(vif41.0) entered forwarding state
>> [  693.080557] xen_bridge: port 7(vif42.0) entered forwarding state
>> [  700.786276] xen_bridge: port 7(vif42.0) entered disabled state
>> [  700.792484] device vif42.0 left promiscuous mode
>> [  700.802409] xen_bridge: port 7(vif42.0) entered disabled state
>> [  704.133606] device vif43.0 entered promiscuous mode
>> [  704.460160] xen-blkback:ring-ref 8, event-channel 9, protocol 1 (x86_64-abi)
>> [  704.469800] xen_bridge: port 7(vif43.0) entered forwarding state
>> [  704.475303] xen_bridge: port 7(vif43.0) entered forwarding state
>> [  719.493788] xen_bridge: port 7(vif43.0) entered forwarding state
>> [  726.302456] xen_bridge: port 7(vif43.0) entered disabled state
>> [  726.308898] device vif43.0 left promiscuous mode
>> [  726.314029] xen_bridge: port 7(vif43.0) entered disabled state
>> 
>> All the guests are already up, but this keeps on going and going and going ....

> The domain number seems to be climbing, are you sure something isn't
> (crashing and) restarting?

Probably due to the BUG_ON from the patch below, i changed it into a WARN_ON.
And i seem to hit it, but only in one of the guests at the moment and it triggers quite irregularly.

[   34.298549] ------------[ cut here ]------------
[   34.298567] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[   34.298574] Modules linked in:
[   34.298597] Pid: 1580, comm: sshd Not tainted 3.6.0pre-rc1-20121011 #1
[   34.298603] Call Trace:
[   34.298611]  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[   34.298617]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[   34.298623]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[   34.298631]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[   34.298637]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[   34.298643]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[   34.298649]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[   34.298656]  [<ffffffff810aa8e5>] ? trace_softirqs_off+0x85/0x1b0
[   34.298663]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[   34.298668]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[   34.298674]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[   34.298680]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[   34.298687]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[   34.298692]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[   34.298699]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[   34.298705]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[   34.298711]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[   34.298717]  [<ffffffff816d19fa>] tcp_write_xmit+0x21a/0xa50
[   34.298723]  [<ffffffff816d225b>] tcp_push_one+0x2b/0x40
[   34.298728]  [<ffffffff816c2dec>] tcp_sendmsg+0x8dc/0xe20
[   34.298735]  [<ffffffff816e8f19>] inet_sendmsg+0xa9/0x100
[   34.298740]  [<ffffffff816e8e70>] ? inet_autobind+0x70/0x70
[   34.298746]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[   34.298753]  [<ffffffff8160630d>] sock_aio_write+0x12d/0x140
[   34.298762]  [<ffffffff811435b2>] do_sync_write+0xa2/0xe0
[   34.298768]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[   34.298774]  [<ffffffff811441d4>] vfs_write+0x174/0x190
[   34.298779]  [<ffffffff811442fa>] sys_write+0x5a/0xa0
[   34.298786]  [<ffffffff812b33de>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[   34.298792]  [<ffffffff817491cc>] cstar_dispatch+0x7/0x26
[   34.298797] ---[ end trace 2e28eec93b7a8b74 ]---


Complete dmesg from guest attached.



>> > diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
>> > index b06ef81..8a3f770 100644
>> > --- a/drivers/net/xen-netfront.c
>> > +++ b/drivers/net/xen-netfront.c
>> > @@ -462,6 +462,8 @@ static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev,
>> >                 ref = gnttab_claim_grant_reference(&np->gref_tx_head);
>> >                 BUG_ON((signed short)ref < 0);
>> >  
>> > +               BUG_ON(PageCompound(skb_frag_page(frag)));
>> > +
>> >                 mfn = pfn_to_mfn(page_to_pfn(skb_frag_page(frag)));
>> >                 gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id,
>> >                                                 mfn, GNTMAP_readonly);
>> 
>> > My repro for netback was just to netcat a wodge of data from dom0->domU
>> > but going the other way doesn't seem to trigger.
>> 
>> 
>>
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 3.6.0pre-rc1-20121011 (root@serveerstertje) (gcc version 4.4.5 (Debian 4.4.5-8) ) #1 SMP PREEMPT Thu Oct 11 11:04:38 CEST 2012
[    0.000000] Command line: root=/dev/xvda1 ro 
[    0.000000] ACPI in unprivileged domain disabled
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] Xen: [mem 0x0000000000000000-0x000000000009ffff] usable
[    0.000000] Xen: [mem 0x00000000000a0000-0x00000000000fffff] reserved
[    0.000000] Xen: [mem 0x0000000000100000-0x000000001fffffff] usable
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] DMI not present or invalid.
[    0.000000] e820: update [mem 0x00000000-0x0000ffff] usable ==> reserved
[    0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
[    0.000000] No AGP bridge found
[    0.000000] e820: last_pfn = 0x20000 max_arch_pfn = 0x400000000
[    0.000000] initial memory mapped: [mem 0x00000000-0x037c9fff]
[    0.000000] Base memory trampoline at [ffff88000009a000] 9a000 size 24576
[    0.000000] init_memory_mapping: [mem 0x00000000-0x1fffffff]
[    0.000000]  [mem 0x00000000-0x1fffffff] page 4k
[    0.000000] kernel direct mapping tables up to 0x1fffffff @ [mem 0x029c4000-0x02ac5fff]
[    0.000000] xen: setting RW the range 2aa6000 - 2ac6000
[    0.000000] RAMDISK: [mem 0x02ac6000-0x037c9fff]
[    0.000000] NUMA turned off
[    0.000000] Faking a node at [mem 0x0000000000000000-0x000000001fffffff]
[    0.000000] Initmem setup node 0 [mem 0x00000000-0x1fffffff]
[    0.000000]   NODE_DATA [mem 0x1fff5000-0x1fffffff]
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x00010000-0x00ffffff]
[    0.000000]   DMA32    [mem 0x01000000-0xffffffff]
[    0.000000]   Normal   empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x00010000-0x0009ffff]
[    0.000000]   node   0: [mem 0x00100000-0x1fffffff]
[    0.000000] On node 0 totalpages: 130960
[    0.000000]   DMA zone: 64 pages used for memmap
[    0.000000]   DMA zone: 6 pages reserved
[    0.000000]   DMA zone: 3914 pages, LIFO batch:0
[    0.000000]   DMA32 zone: 1984 pages used for memmap
[    0.000000]   DMA32 zone: 124992 pages, LIFO batch:31
[    0.000000] smpboot: Allowing 1 CPUs, 0 hotplug CPUs
[    0.000000] No local APIC present
[    0.000000] APIC: disable apic facility
[    0.000000] APIC: switched to apic NOOP
[    0.000000] nr_irqs_gsi: 16
[    0.000000] e820: [mem 0x20000000-0xffffffff] available for PCI devices
[    0.000000] Booting paravirtualized kernel on Xen
[    0.000000] Xen version: 4.3-unstable (preserve-AD)
[    0.000000] setup_percpu: NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:1 nr_node_ids:1
[    0.000000] PERCPU: Embedded 27 pages/cpu @ffff88001fc00000 s81088 r8192 d21312 u2097152
[    0.000000] pcpu-alloc: s81088 r8192 d21312 u2097152 alloc=1*2097152
[    0.000000] pcpu-alloc: [0] 0 
[    0.000000] Built 1 zonelists in Node order, mobility grouping on.  Total pages: 128906
[    0.000000] Policy zone: DMA32
[    0.000000] Kernel command line: root=/dev/xvda1 ro 
[    0.000000] PID hash table entries: 2048 (order: 2, 16384 bytes)
[    0.000000] __ex_table already sorted, skipping sort
[    0.000000] Checking aperture...
[    0.000000] No AGP bridge found
[    0.000000] Memory: 476724k/524288k available (7472k kernel code, 448k absent, 47116k reserved, 5626k data, 696k init)
[    0.000000] SLUB: Genslabs=15, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] Preemptible hierarchical RCU implementation.
[    0.000000] 	RCU dyntick-idle grace-period acceleration is enabled.
[    0.000000] 	Additional per-CPU info printed with stalls.
[    0.000000] 	RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=1.
[    0.000000] NR_IRQS:4352 nr_irqs:256 16
[    0.000000] Console: colour dummy device 80x25
[    0.000000] console [tty0] enabled
[    0.000000] console [hvc0] enabled
[    0.000000] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
[    0.000000] ... MAX_LOCKDEP_SUBCLASSES:  8
[    0.000000] ... MAX_LOCK_DEPTH:          48
[    0.000000] ... MAX_LOCKDEP_KEYS:        8191
[    0.000000] ... CLASSHASH_SIZE:          4096
[    0.000000] ... MAX_LOCKDEP_ENTRIES:     16384
[    0.000000] ... MAX_LOCKDEP_CHAINS:      32768
[    0.000000] ... CHAINHASH_SIZE:          16384
[    0.000000]  memory used by lock dependency info: 5855 kB
[    0.000000]  per task-struct memory footprint: 1920 bytes
[    0.000000] Xen: using vcpuop timer interface
[    0.000000] installing Xen timer for CPU 0
[    0.000000] tsc: Detected 3200.144 MHz processor
[    0.003333] Calibrating delay loop (skipped), value calculated using timer frequency.. 6402.96 BogoMIPS (lpj=10667146)
[    0.003333] pid_max: default: 32768 minimum: 301
[    0.003333] Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
[    0.003333] Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
[    0.003333] Mount-cache hash table entries: 256
[    0.003333] Initializing cgroup subsys cpuacct
[    0.003333] Initializing cgroup subsys freezer
[    0.003333] Initializing cgroup subsys blkio
[    0.003333] tseg: 0000000000
[    0.003333] CPU: Physical Processor ID: 0
[    0.003333] CPU: Processor Core ID: 1
[    0.003333] Last level iTLB entries: 4KB 512, 2MB 16, 4MB 8
[    0.003333] Last level dTLB entries: 4KB 512, 2MB 128, 4MB 64
[    0.003333] tlb_flushall_shift: 4
[    0.025363] Freeing SMP alternatives: 24k freed
[    0.026174] Performance Events: 
[    0.026187] no APIC, boot with the "lapic" boot parameter to force-enable it.
[    0.026193] no hardware sampling interrupt available.
[    0.026215] Broken PMU hardware detected, using software events only.
[    0.026220] Failed to access perfctr msr (MSR c0010004 is 2185c52b638f)
[    0.043549] Brought up 1 CPUs
[    0.043634] NMI watchdog: disabled (cpu0): hardware events not enabled
[    0.044079] Grant tables using version 2 layout.
[    0.044103] Grant table initialized
[    0.044225] NET: Registered protocol family 16
[    0.045499] PCI: setting up Xen PCI frontend stub
[    0.045499] PCI: pci_cache_line_size set to 64 bytes
[    0.063094] bio: create slab <bio-0> at 0
[    0.063323] ACPI: Interpreter disabled.
[    0.063517] xen/balloon: Initialising balloon driver.
[    0.063594] xen-balloon: Initialising balloon driver.
[    0.063594] vgaarb: loaded
[    0.063795] SCSI subsystem initialized
[    0.063931] libata version 3.00 loaded.
[    0.064210] usbcore: registered new interface driver usbfs
[    0.064270] usbcore: registered new interface driver hub
[    0.064346] usbcore: registered new device driver usb
[    0.064482] Linux video capture interface: v2.00
[    0.064809] Advanced Linux Sound Architecture Driver Initialized.
[    0.064815] PCI: System does not support PCI
[    0.064819] PCI: System does not support PCI
[    0.067137] Switching to clocksource xen
[    0.067388] pnp: PnP ACPI: disabled
[    0.071247] NET: Registered protocol family 2
[    0.071479] TCP established hash table entries: 16384 (order: 6, 262144 bytes)
[    0.071680] TCP bind hash table entries: 16384 (order: 8, 1048576 bytes)
[    0.072505] TCP: Hash tables configured (established 16384 bind 16384)
[    0.072557] TCP: reno registered
[    0.072574] UDP hash table entries: 256 (order: 3, 40960 bytes)
[    0.072612] UDP-Lite hash table entries: 256 (order: 3, 40960 bytes)
[    0.072755] NET: Registered protocol family 1
[    0.072767] PCI: CLS 0 bytes, default 64
[    0.072912] Trying to unpack rootfs image as initramfs...
[    0.094234] Freeing initrd memory: 13328k freed
[    0.101194] DMA-API: preallocated 32768 debug entries
[    0.101206] DMA-API: debugging enabled by kernel config
[    0.101420] platform rtc_cmos: registered platform RTC device (no PNP device found)
[    0.102549] sha1_ssse3: Neither AVX nor SSSE3 is available/usable.
[    0.102915] audit: initializing netlink socket (disabled)
[    0.102948] type=2000 audit(1349948050.825:1): initialized
[    0.103470] HugeTLB registered 2 MB page size, pre-allocated 0 pages
[    0.108912] VFS: Disk quotas dquot_6.5.2
[    0.109021] Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[    0.110540] NTFS driver 2.1.30 [Flags: R/W].
[    0.110758] fuse init (API version 7.20)
[    0.110960] msgmni has been set to 957
[    0.111673] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
[    0.111695] io scheduler noop registered
[    0.111699] io scheduler deadline registered
[    0.111880] io scheduler cfq registered (default)
[    0.112908] crc32: CRC_LE_BITS = 64, CRC_BE BITS = 64
[    0.112912] crc32: self tests passed, processed 225944 bytes in 112580 nsec
[    0.113021] crc32c: CRC_LE_BITS = 64
[    0.117226] crc32c: self tests passed, processed 225944 bytes in 50333 nsec
[    0.117576] pci_hotplug: PCI Hot Plug PCI Core version: 0.5
[    0.117797] pciehp: PCI Express Hot Plug Controller Driver version: 0.4
[    0.118013] usbcore: registered new interface driver udlfb
[    0.118467] Event-channel device installed.
[    0.119213] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    0.120055] Linux agpgart interface v0.103
[    0.120374] Hangcheck: starting hangcheck timer 0.9.1 (tick is 180 seconds, margin is 60 seconds).
[    0.120383] Hangcheck: Using getrawmonotonic().
[    0.120443] [drm] Initialized drm 1.1.0 20060810
[    0.123268] brd: module loaded
[    0.124859] loop: module loaded
[    0.127778] tun: Universal TUN/TAP device driver, 1.6
[    0.127792] tun: (C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>
[    0.127873] e1000: Intel(R) PRO/1000 Network Driver - version 7.3.21-k8-NAPI
[    0.127880] e1000: Copyright (c) 1999-2006 Intel Corporation.
[    0.128004] Initialising Xen virtual ethernet driver.
[    0.133058] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    0.133071] ehci_hcd: block sizes: qh 104 qtd 96 itd 192 sitd 96
[    0.133130] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    0.133136] ohci_hcd: block sizes: ed 80 td 96
[    0.133188] uhci_hcd: USB Universal Host Controller Interface driver
[    0.133301] usbcore: registered new interface driver usblp
[    0.133306] Initializing USB Mass Storage driver...
[    0.133359] usbcore: registered new interface driver usb-storage
[    0.133364] USB Mass Storage support registered.
[    0.133497] usbcore: registered new interface driver usbserial
[    0.133568] usbcore: registered new interface driver cp210x
[    0.133701] usbserial: USB Serial support registered for cp210x
[    0.133758] usbcore: registered new interface driver cypress_m8
[    0.133815] usbserial: USB Serial support registered for DeLorme Earthmate USB
[    0.133872] usbserial: USB Serial support registered for HID->COM RS232 Adapter
[    0.133931] usbserial: USB Serial support registered for Nokia CA-42 V2 Adapter
[    0.133989] usbcore: registered new interface driver mos7720
[    0.134045] usbserial: USB Serial support registered for Moschip 2 port adapter
[    0.134102] usbcore: registered new interface driver mos7840
[    0.134158] usbserial: USB Serial support registered for Moschip 7840/7820 USB Serial Driver
[    0.134360] i8042: PNP: No PS/2 controller found. Probing ports directly.
[    0.135190] i8042: No controller found
[    0.135284] mousedev: PS/2 mouse device common for all mice
[    0.137520] blkfront: xvda: flush diskcache: enabled
[    0.196054] rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0
[    0.196438] ida_remove called for id=0 which is not allocated.
[    0.196448] rtc_cmos: probe of rtc_cmos failed with error -38
[    0.197009] lirc_dev: IR Remote Control driver registered, major 250 
[    0.197027] IR NEC protocol handler initialized
[    0.197031] IR RC5(x) protocol handler initialized
[    0.197035] IR RC6 protocol handler initialized
[    0.197038] IR JVC protocol handler initialized
[    0.197041] IR Sony protocol handler initialized
[    0.197045] IR RC5 (streamzap) protocol handler initialized
[    0.197049] IR SANYO protocol handler initialized
[    0.197052] IR MCE Keyboard/mouse protocol handler initialized
[    0.197057] IR LIRC bridge handler initialized
[    0.197268] sp5100_tco: SP5100 TCO WatchDog Timer Driver v0.01
[    0.197382] xen_wdt: Xen WatchDog Timer Driver v0.01
[    0.197578] xen_wdt: initialized (timeout=60s, nowayout=0)
[    0.197820] device-mapper: ioctl: 4.23.0-ioctl (2012-07-25) initialised: dm-devel@redhat.com
[    0.199123] usbcore: registered new interface driver usbhid
[    0.199129] usbhid: USB HID core driver
[    0.202313] usbcore: registered new interface driver snd-usb-audio
[    0.202373] usbcore: registered new interface driver snd-ua101
[    0.202434] usbcore: registered new interface driver snd-usb-usx2y
[    0.202488] usbcore: registered new interface driver snd-usb-caiaq
[    0.202543] usbcore: registered new interface driver snd-usb-6fire
[    0.202575] Netfilter messages via NETLINK v0.30.
[    0.202583] nfnl_acct: registering with nfnetlink.
[    0.202626] nf_conntrack version 0.5.0 (3828 buckets, 15312 max)
[    0.202950] ctnetlink v0.93: registering with nfnetlink.
[    0.203250] xt_time: kernel timezone is -0000
[    0.316848] ip_set: protocol 6
[    0.316875] IPVS: Registered protocols ()
[    0.316996] IPVS: Connection hash table configured (size=4096, memory=64Kbytes)
[    0.317068] IPVS: Creating netns size=1896 id=0
[    0.317100] IPVS: ipvs loaded.
[    0.317213] ip_tables: (C) 2000-2006 Netfilter Core Team
[    0.317279] TCP: cubic registered
[    0.317285] NET: Registered protocol family 17
[    0.317340] Bridge firewalling registered
[    0.317359] Ebtables v2.0 registered
[    0.317617] registered taskstats version 1
[    0.782134]  xvda: xvda1 xvda2
[    0.817140] console [netcon0] enabled
[    0.817166] netconsole: network logging started
[    0.817368] ALSA device list:
[    0.817385]   No soundcards found.
[    0.820425] Freeing unused kernel memory: 696k freed
[    0.820887] Write protecting the kernel read-only data: 12288k
[    0.837830] Freeing unused kernel memory: 708k freed
[    0.839937] Freeing unused kernel memory: 1076k freed
[    3.871581] EXT4-fs (xvda1): mounted filesystem with ordered data mode. Opts: (null)
[   13.486115] Adding 769020k swap on /dev/xvda2.  Priority:-1 extents:1 across:769020k SS
[   13.529134] EXT4-fs (xvda1): re-mounted. Opts: (null)
[   14.449206] EXT4-fs (xvda1): re-mounted. Opts: errors=remount-ro
[   22.967397] tty_init_dev: 2 callbacks suppressed
[   22.967692] ttyS0: LSR safety check engaged!
[   22.970334] ttyS0: LSR safety check engaged!
[   22.972956] ttyS1: LSR safety check engaged!
[   22.974811] ttyS1: LSR safety check engaged!
[   34.298549] ------------[ cut here ]------------
[   34.298567] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[   34.298574] Modules linked in:
[   34.298597] Pid: 1580, comm: sshd Not tainted 3.6.0pre-rc1-20121011 #1
[   34.298603] Call Trace:
[   34.298611]  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[   34.298617]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[   34.298623]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[   34.298631]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[   34.298637]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[   34.298643]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[   34.298649]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[   34.298656]  [<ffffffff810aa8e5>] ? trace_softirqs_off+0x85/0x1b0
[   34.298663]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[   34.298668]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[   34.298674]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[   34.298680]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[   34.298687]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[   34.298692]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[   34.298699]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[   34.298705]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[   34.298711]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[   34.298717]  [<ffffffff816d19fa>] tcp_write_xmit+0x21a/0xa50
[   34.298723]  [<ffffffff816d225b>] tcp_push_one+0x2b/0x40
[   34.298728]  [<ffffffff816c2dec>] tcp_sendmsg+0x8dc/0xe20
[   34.298735]  [<ffffffff816e8f19>] inet_sendmsg+0xa9/0x100
[   34.298740]  [<ffffffff816e8e70>] ? inet_autobind+0x70/0x70
[   34.298746]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[   34.298753]  [<ffffffff8160630d>] sock_aio_write+0x12d/0x140
[   34.298762]  [<ffffffff811435b2>] do_sync_write+0xa2/0xe0
[   34.298768]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[   34.298774]  [<ffffffff811441d4>] vfs_write+0x174/0x190
[   34.298779]  [<ffffffff811442fa>] sys_write+0x5a/0xa0
[   34.298786]  [<ffffffff812b33de>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[   34.298792]  [<ffffffff817491cc>] cstar_dispatch+0x7/0x26
[   34.298797] ---[ end trace 2e28eec93b7a8b74 ]---
[   34.298825] ------------[ cut here ]------------
[   34.298832] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[   34.298838] Modules linked in:
[   34.298843] Pid: 1580, comm: sshd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[   34.298848] Call Trace:
[   34.298852]  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[   34.298858]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[   34.298864]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[   34.298870]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[   34.298876]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[   34.298881]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[   34.298887]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[   34.298893]  [<ffffffff810aa8e5>] ? trace_softirqs_off+0x85/0x1b0
[   34.298899]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[   34.298904]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[   34.298910]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[   34.298916]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[   34.298921]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[   34.298927]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[   34.298932]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[   34.298938]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[   34.298943]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[   34.298949]  [<ffffffff816d19fa>] tcp_write_xmit+0x21a/0xa50
[   34.298955]  [<ffffffff816d229d>] __tcp_push_pending_frames+0x2d/0x90
[   34.298961]  [<ffffffff816c2693>] tcp_sendmsg+0x183/0xe20
[   34.298966]  [<ffffffff816e8f19>] inet_sendmsg+0xa9/0x100
[   34.298972]  [<ffffffff816e8e70>] ? inet_autobind+0x70/0x70
[   34.298977]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[   34.298983]  [<ffffffff8160630d>] sock_aio_write+0x12d/0x140
[   34.298988]  [<ffffffff811435b2>] do_sync_write+0xa2/0xe0
[   34.298994]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[   34.299000]  [<ffffffff811441d4>] vfs_write+0x174/0x190
[   34.299005]  [<ffffffff811442fa>] sys_write+0x5a/0xa0
[   34.299011]  [<ffffffff812b33de>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[   34.299017]  [<ffffffff817491cc>] cstar_dispatch+0x7/0x26
[   34.299022] ---[ end trace 2e28eec93b7a8b75 ]---
[   34.299036] ------------[ cut here ]------------
[   34.299042] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[   34.299047] Modules linked in:
[   34.299052] Pid: 1580, comm: sshd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[   34.299057] Call Trace:
[   34.299061]  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[   34.299071]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[   34.299077]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[   34.299084]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[   34.299089]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[   34.299095]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[   34.299101]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[   34.299106]  [<ffffffff810aa8e5>] ? trace_softirqs_off+0x85/0x1b0
[   34.299112]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[   34.299118]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[   34.299124]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[   34.299129]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[   34.299135]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[   34.299140]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[   34.299146]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[   34.299152]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[   34.299157]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[   34.299163]  [<ffffffff816d19fa>] tcp_write_xmit+0x21a/0xa50
[   34.299169]  [<ffffffff816d229d>] __tcp_push_pending_frames+0x2d/0x90
[   34.299174]  [<ffffffff816c2693>] tcp_sendmsg+0x183/0xe20
[   34.299180]  [<ffffffff816e8f19>] inet_sendmsg+0xa9/0x100
[   34.299185]  [<ffffffff816e8e70>] ? inet_autobind+0x70/0x70
[   34.299191]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[   34.299196]  [<ffffffff8160630d>] sock_aio_write+0x12d/0x140
[   34.299202]  [<ffffffff811435b2>] do_sync_write+0xa2/0xe0
[   34.299208]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[   34.299213]  [<ffffffff811441d4>] vfs_write+0x174/0x190
[   34.299219]  [<ffffffff811442fa>] sys_write+0x5a/0xa0
[   34.299224]  [<ffffffff812b33de>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[   34.299239]  [<ffffffff817491cc>] cstar_dispatch+0x7/0x26
[   34.299243] ---[ end trace 2e28eec93b7a8b76 ]---
[   34.794592] ------------[ cut here ]------------
[   34.794615] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[   34.794623] Modules linked in:
[   34.794632] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[   34.794640] Call Trace:
[   34.794644]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[   34.794660]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[   34.794667]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[   34.794677]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[   34.794685]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[   34.794693]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[   34.794701]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[   34.794710]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[   34.794719]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[   34.794730]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[   34.794742]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[   34.794750]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[   34.794757]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[   34.794765]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[   34.794773]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[   34.794781]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[   34.794788]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[   34.794796]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[   34.794804]  [<ffffffff816d167e>] tcp_xmit_retransmit_queue+0x19e/0x300
[   34.794812]  [<ffffffff816c99ff>] tcp_fastretrans_alert+0x94f/0xcb0
[   34.794819]  [<ffffffff816ca70c>] tcp_ack+0x9ac/0x1150
[   34.794827]  [<ffffffff816cd858>] tcp_rcv_established+0x318/0x640
[   34.794838]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[   34.794845]  [<ffffffff816d54d5>] tcp_v4_do_rcv+0x135/0x480
[   34.794854]  [<ffffffff817461d2>] ? _raw_spin_lock_nested+0x42/0x50
[   34.794862]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[   34.794869]  [<ffffffff816d617d>] tcp_v4_rcv+0x95d/0xb10
[   34.794876]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[   34.794884]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[   34.794892]  [<ffffffff816b2a6a>] ip_local_deliver_finish+0x11a/0x230
[   34.794900]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[   34.794908]  [<ffffffff816b2bb8>] ip_local_deliver+0x38/0x80
[   34.794915]  [<ffffffff816b217a>] ip_rcv_finish+0x15a/0x630
[   34.794922]  [<ffffffff816b2868>] ip_rcv+0x218/0x300
[   34.794930]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[   34.794937]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[   34.794945]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[   34.794953]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[   34.794961]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[   34.794968]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[   34.794976]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[   34.794990]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[   34.794998]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[   34.795006]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[   34.795014]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[   34.795021]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[   34.795028]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[   34.795037]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[   34.795044]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[   34.795050]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   34.795063]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   34.795072]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[   34.795080]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[   34.795087]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[   34.795094]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[   34.795101]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[   34.795111]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[   34.795119]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[   34.795126]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[   34.795135]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[   34.795142] ---[ end trace 2e28eec93b7a8b77 ]---
[   34.795170] ------------[ cut here ]------------
[   34.795178] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[   34.795186] Modules linked in:
[   34.795192] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[   34.795199] Call Trace:
[   34.795203]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[   34.795215]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[   34.795223]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[   34.795231]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[   34.795239]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[   34.795247]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[   34.795254]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[   34.795262]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[   34.795270]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[   34.795278]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[   34.795285]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[   34.795293]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[   34.795300]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[   34.795307]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[   34.795315]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[   34.795322]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[   34.795330]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[   34.795337]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[   34.795345]  [<ffffffff816d167e>] tcp_xmit_retransmit_queue+0x19e/0x300
[   34.795354]  [<ffffffff816c99ff>] tcp_fastretrans_alert+0x94f/0xcb0
[   34.795362]  [<ffffffff816ca70c>] tcp_ack+0x9ac/0x1150
[   34.795369]  [<ffffffff816cd858>] tcp_rcv_established+0x318/0x640
[   34.795377]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[   34.795384]  [<ffffffff816d54d5>] tcp_v4_do_rcv+0x135/0x480
[   34.795392]  [<ffffffff817461d2>] ? _raw_spin_lock_nested+0x42/0x50
[   34.795399]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[   34.795406]  [<ffffffff816d617d>] tcp_v4_rcv+0x95d/0xb10
[   34.795413]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[   34.795420]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[   34.795429]  [<ffffffff816b2a6a>] ip_local_deliver_finish+0x11a/0x230
[   34.795440]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[   34.795452]  [<ffffffff816b2bb8>] ip_local_deliver+0x38/0x80
[   34.795459]  [<ffffffff816b217a>] ip_rcv_finish+0x15a/0x630
[   34.795466]  [<ffffffff816b2868>] ip_rcv+0x218/0x300
[   34.795473]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[   34.795482]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[   34.795490]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[   34.795497]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[   34.795505]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[   34.795513]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[   34.795520]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[   34.795529]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[   34.795536]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[   34.795544]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[   34.795551]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[   34.795558]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[   34.795565]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[   34.795572]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[   34.795580]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[   34.795586]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   34.795598]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   34.795606]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[   34.795613]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[   34.795620]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[   34.795627]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[   34.795633]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[   34.795641]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[   34.795649]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[   34.795656]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[   34.795665]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[   34.795672] ---[ end trace 2e28eec93b7a8b78 ]---
[   34.797450] ------------[ cut here ]------------
[   34.797464] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[   34.797474] Modules linked in:
[   34.797482] Pid: 1532, comm: klogd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[   34.797489] Call Trace:
[   34.797493]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[   34.797506]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[   34.797513]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[   34.797522]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[   34.797530]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[   34.797537]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[   34.797545]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[   34.797554]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[   34.797562]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[   34.797570]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[   34.797578]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[   34.797587]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[   34.797594]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[   34.797601]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[   34.797609]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[   34.797617]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[   34.797624]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[   34.797632]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[   34.797640]  [<ffffffff81746cb5>] ? _raw_spin_unlock_irqrestore+0x75/0xa0
[   34.797648]  [<ffffffff816d167e>] tcp_xmit_retransmit_queue+0x19e/0x300
[   34.797656]  [<ffffffff816c99ff>] tcp_fastretrans_alert+0x94f/0xcb0
[   34.797663]  [<ffffffff816ca70c>] tcp_ack+0x9ac/0x1150
[   34.797671]  [<ffffffff816cd8ce>] tcp_rcv_established+0x38e/0x640
[   34.797678]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[   34.797686]  [<ffffffff816d54d5>] tcp_v4_do_rcv+0x135/0x480
[   34.797693]  [<ffffffff817461d2>] ? _raw_spin_lock_nested+0x42/0x50
[   34.797701]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[   34.797708]  [<ffffffff816d617d>] tcp_v4_rcv+0x95d/0xb10
[   34.797715]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[   34.797723]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[   34.797731]  [<ffffffff816b2a6a>] ip_local_deliver_finish+0x11a/0x230
[   34.797743]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[   34.797751]  [<ffffffff816b2bb8>] ip_local_deliver+0x38/0x80
[   34.797759]  [<ffffffff816b217a>] ip_rcv_finish+0x15a/0x630
[   34.797766]  [<ffffffff816b2868>] ip_rcv+0x218/0x300
[   34.797773]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[   34.797780]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[   34.797788]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[   34.797796]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[   34.797804]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[   34.797811]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[   34.797819]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[   34.797827]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[   34.797835]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[   34.797842]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[   34.797849]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[   34.797856]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[   34.797863]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[   34.797871]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[   34.797879]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[   34.797885]  <EOI> 
[   34.797889] ---[ end trace 2e28eec93b7a8b79 ]---
[   34.797917] ------------[ cut here ]------------
[   34.797925] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[   34.797932] Modules linked in:
[   34.797939] Pid: 1532, comm: klogd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[   34.797947] Call Trace:
[   34.797950]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[   34.797962]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[   34.797970]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[   34.797978]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[   34.797986]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[   34.797994]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[   34.798001]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[   34.798012]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[   34.798019]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[   34.798027]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[   34.798035]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[   34.798043]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[   34.798050]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[   34.798057]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[   34.798065]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[   34.798072]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[   34.798080]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[   34.798087]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[   34.798095]  [<ffffffff81746cb5>] ? _raw_spin_unlock_irqrestore+0x75/0xa0
[   34.798103]  [<ffffffff816d167e>] tcp_xmit_retransmit_queue+0x19e/0x300
[   34.798111]  [<ffffffff816c99ff>] tcp_fastretrans_alert+0x94f/0xcb0
[   34.798119]  [<ffffffff816ca70c>] tcp_ack+0x9ac/0x1150
[   34.798126]  [<ffffffff816cd8ce>] tcp_rcv_established+0x38e/0x640
[   34.798134]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[   34.798141]  [<ffffffff816d54d5>] tcp_v4_do_rcv+0x135/0x480
[   34.798149]  [<ffffffff817461d2>] ? _raw_spin_lock_nested+0x42/0x50
[   34.798156]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[   34.798164]  [<ffffffff816d617d>] tcp_v4_rcv+0x95d/0xb10
[   34.798171]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[   34.798178]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[   34.798186]  [<ffffffff816b2a6a>] ip_local_deliver_finish+0x11a/0x230
[   34.798194]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[   34.798202]  [<ffffffff816b2bb8>] ip_local_deliver+0x38/0x80
[   34.798210]  [<ffffffff816b217a>] ip_rcv_finish+0x15a/0x630
[   34.798220]  [<ffffffff816b2868>] ip_rcv+0x218/0x300
[   34.798227]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[   34.798234]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[   34.798242]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[   34.798249]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[   34.798257]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[   34.798265]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[   34.798276]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[   34.798285]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[   34.798292]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[   34.798300]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[   34.798307]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[   34.798314]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[   34.798321]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[   34.798328]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[   34.798335]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[   34.798342]  <EOI> 
[   34.798345] ---[ end trace 2e28eec93b7a8b7a ]---
[   34.798368] ------------[ cut here ]------------
[   34.798375] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[   34.798383] Modules linked in:
[   34.798388] Pid: 1532, comm: klogd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[   34.798396] Call Trace:
[   34.798400]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[   34.798411]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[   34.798418]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[   34.798426]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[   34.798434]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[   34.798442]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[   34.798449]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[   34.798457]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[   34.798465]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[   34.798472]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[   34.798480]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[   34.798487]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[   34.798494]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[   34.798502]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[   34.798510]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[   34.798518]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[   34.798526]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[   34.798534]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[   34.798541]  [<ffffffff81746cb5>] ? _raw_spin_unlock_irqrestore+0x75/0xa0
[   34.798550]  [<ffffffff816d167e>] tcp_xmit_retransmit_queue+0x19e/0x300
[   34.798558]  [<ffffffff816c99ff>] tcp_fastretrans_alert+0x94f/0xcb0
[   34.798565]  [<ffffffff816ca70c>] tcp_ack+0x9ac/0x1150
[   34.798573]  [<ffffffff816cd8ce>] tcp_rcv_established+0x38e/0x640
[   34.798580]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[   34.798588]  [<ffffffff816d54d5>] tcp_v4_do_rcv+0x135/0x480
[   34.798595]  [<ffffffff817461d2>] ? _raw_spin_lock_nested+0x42/0x50
[   34.798603]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[   34.798610]  [<ffffffff816d617d>] tcp_v4_rcv+0x95d/0xb10
[   34.798617]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[   34.798624]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[   34.798633]  [<ffffffff816b2a6a>] ip_local_deliver_finish+0x11a/0x230
[   34.798640]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[   34.798648]  [<ffffffff816b2bb8>] ip_local_deliver+0x38/0x80
[   34.798656]  [<ffffffff816b217a>] ip_rcv_finish+0x15a/0x630
[   34.798663]  [<ffffffff816b2868>] ip_rcv+0x218/0x300
[   34.798670]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[   34.798678]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[   34.798685]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[   34.798693]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[   34.798701]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[   34.798708]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[   34.798716]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[   34.798725]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[   34.798732]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[   34.798739]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[   34.798747]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[   34.798754]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[   34.798761]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[   34.798768]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[   34.798776]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[   34.798782]  <EOI> 
[   34.798786] ---[ end trace 2e28eec93b7a8b7b ]---
[   35.363444] ------------[ cut here ]------------
[   35.363461] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[   35.363468] Modules linked in:
[   35.363474] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[   35.363480] Call Trace:
[   35.363483]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[   35.363495]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[   35.363500]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[   35.363509]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[   35.363515]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[   35.363522]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[   35.363528]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[   35.363535]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[   35.363542]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[   35.363548]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[   35.363555]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[   35.363560]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[   35.363566]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[   35.363571]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[   35.363578]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[   35.363585]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[   35.363591]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[   35.363597]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[   35.363603]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   35.363609]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[   35.363615]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[   35.363620]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[   35.363626]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[   35.363632]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[   35.363637]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   35.363643]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   35.363649]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[   35.363656]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[   35.363662]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[   35.363668]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[   35.363673]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[   35.363680]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[   35.363686]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[   35.363691]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   35.363701]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   35.363707]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[   35.363713]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[   35.363719]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[   35.363724]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[   35.363729]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[   35.363737]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[   35.363743]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[   35.363749]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[   35.363759]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[   35.363764] ---[ end trace 2e28eec93b7a8b7c ]---
[   36.500221] ------------[ cut here ]------------
[   36.500267] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[   36.500293] Modules linked in:
[   36.500315] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[   36.500339] Call Trace:
[   36.500351]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[   36.500396]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[   36.500420]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[   36.500447]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[   36.500471]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[   36.500494]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[   36.500516]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[   36.500541]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[   36.500570]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[   36.500594]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[   36.500619]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[   36.500641]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[   36.500662]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[   36.500684]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[   36.500709]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[   36.500732]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[   36.500755]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[   36.500779]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[   36.500803]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   36.500827]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[   36.500850]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[   36.500874]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[   36.500897]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[   36.500917]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[   36.500938]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   36.500962]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   36.500985]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[   36.501011]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[   36.501034]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[   36.501055]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[   36.501077]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[   36.501101]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[   36.501124]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[   36.501143]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   36.501181]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   36.501205]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[   36.501228]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[   36.501249]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[   36.501270]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[   36.501290]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[   36.501318]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[   36.501341]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[   36.501364]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[   36.501388]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[   36.501409] ---[ end trace 2e28eec93b7a8b7d ]---
[   38.773510] ------------[ cut here ]------------
[   38.773528] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[   38.773535] Modules linked in:
[   38.773542] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[   38.773548] Call Trace:
[   38.773552]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[   38.773564]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[   38.773570]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[   38.773582]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[   38.773589]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[   38.773594]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[   38.773600]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[   38.773607]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[   38.773613]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[   38.773619]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[   38.773625]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[   38.773631]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[   38.773636]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[   38.773643]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[   38.773649]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[   38.773656]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[   38.773662]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[   38.773668]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[   38.773674]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   38.773680]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[   38.773685]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[   38.773691]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[   38.773697]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[   38.773702]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[   38.773707]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   38.773713]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   38.773719]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[   38.773726]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[   38.773732]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[   38.773738]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[   38.773743]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[   38.773751]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[   38.773756]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[   38.773761]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   38.773771]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   38.773778]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[   38.773784]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[   38.773789]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[   38.773794]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[   38.773800]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[   38.773807]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[   38.773813]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[   38.773819]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[   38.773825]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[   38.773831] ---[ end trace 2e28eec93b7a8b7e ]---
[   43.320207] ------------[ cut here ]------------
[   43.320235] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[   43.320244] Modules linked in:
[   43.320252] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[   43.320261] Call Trace:
[   43.320265]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[   43.320280]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[   43.320288]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[   43.320298]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[   43.320307]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[   43.320315]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[   43.320323]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[   43.320337]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[   43.320346]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[   43.320354]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[   43.320362]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[   43.320370]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[   43.320377]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[   43.320385]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[   43.320393]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[   43.320402]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[   43.320409]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[   43.320417]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[   43.320425]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   43.320433]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[   43.320441]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[   43.320449]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[   43.320456]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[   43.320463]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[   43.320470]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   43.320479]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   43.320487]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[   43.320496]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[   43.320503]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[   43.320511]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[   43.320518]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[   43.320528]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[   43.320535]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[   43.320542]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   43.320555]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   43.320564]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[   43.320571]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[   43.320578]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[   43.320586]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[   43.320592]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[   43.320602]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[   43.320610]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[   43.320617]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[   43.320626]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[   43.320633] ---[ end trace 2e28eec93b7a8b7f ]---
[   52.400126] ------------[ cut here ]------------
[   52.400146] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[   52.400152] Modules linked in:
[   52.400158] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[   52.400164] Call Trace:
[   52.400167]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[   52.400178]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[   52.400183]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[   52.400191]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[   52.400197]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[   52.400202]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[   52.400208]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[   52.400214]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[   52.400221]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[   52.400226]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[   52.400232]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[   52.400237]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[   52.400242]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[   52.400247]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[   52.400254]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[   52.400261]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[   52.400266]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[   52.400272]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[   52.400278]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   52.400283]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[   52.400288]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[   52.400293]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[   52.400299]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[   52.400303]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[   52.400308]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   52.400313]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   52.400319]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[   52.400325]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[   52.400330]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[   52.400336]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[   52.400341]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[   52.400347]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[   52.400352]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[   52.400356]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   52.400366]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   52.400371]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[   52.400377]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[   52.400382]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[   52.400387]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[   52.400391]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[   52.400398]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[   52.400403]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[   52.400408]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[   52.400414]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[   52.400420] ---[ end trace 2e28eec93b7a8b80 ]---
[   70.560242] ------------[ cut here ]------------
[   70.560332] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[   70.560360] Modules linked in:
[   70.560381] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[   70.560408] Call Trace:
[   70.560421]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[   70.560462]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[   70.560485]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[   70.560512]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[   70.560536]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[   70.560559]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[   70.560581]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[   70.560605]  [<ffffffff81629a77>] neigh_resolve_output+0x127/0x250
[   70.560630]  [<ffffffff816b96ad>] ip_finish_output+0x39d/0x530
[   70.560653]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[   70.560679]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[   70.560701]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[   70.560722]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[   70.560744]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[   70.560768]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[   70.560791]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[   70.560812]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[   70.560835]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[   70.560859]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   70.560882]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[   70.560905]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[   70.560928]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[   70.560951]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[   70.560972]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[   70.560993]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   70.561017]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[   70.561040]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[   70.561064]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[   70.561087]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[   70.561108]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[   70.561130]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[   70.561153]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[   70.561176]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[   70.561195]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   70.561232]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[   70.561256]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[   70.561278]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[   70.561299]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[   70.561319]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[   70.561339]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[   70.561390]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[   70.561414]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[   70.561436]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[   70.561462]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[   70.561483] ---[ end trace 2e28eec93b7a8b81 ]---
[  106.933420] ------------[ cut here ]------------
[  106.933445] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  106.933452] Modules linked in:
[  106.933458] Pid: 1954, comm: gzip Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  106.933463] Call Trace:
[  106.933466]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  106.933476]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  106.933482]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  106.933490]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  106.933496]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  106.933501]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  106.933506]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  106.933512]  [<ffffffff81629a77>] neigh_resolve_output+0x127/0x250
[  106.933519]  [<ffffffff816b96ad>] ip_finish_output+0x39d/0x530
[  106.933525]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  106.933530]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  106.933535]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  106.933540]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  106.933545]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  106.933551]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  106.933557]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  106.933562]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  106.933567]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  106.933573]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  106.933578]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  106.933584]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  106.933590]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  106.933595]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  106.933600]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  106.933604]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  106.933610]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  106.933615]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  106.933621]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  106.933627]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  106.933632]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  106.933637]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  106.933643]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  106.933648]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  106.933653]  <EOI> 
[  106.933655] ---[ end trace 2e28eec93b7a8b82 ]---
[  179.680315] ------------[ cut here ]------------
[  179.680344] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  179.680357] Modules linked in:
[  179.680369] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  179.680381] Call Trace:
[  179.680387]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  179.680409]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  179.680420]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  179.680437]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  179.680449]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  179.680461]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  179.680472]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  179.680485]  [<ffffffff81629a77>] neigh_resolve_output+0x127/0x250
[  179.680498]  [<ffffffff816b96ad>] ip_finish_output+0x39d/0x530
[  179.680511]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  179.680523]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  179.680533]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  179.680544]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  179.680555]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  179.680567]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  179.680579]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  179.680591]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  179.680603]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  179.680615]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  179.680627]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  179.680639]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  179.680651]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  179.680662]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  179.680673]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  179.680683]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  179.680696]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  179.680707]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  179.680720]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  179.680732]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  179.680743]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  179.680754]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  179.680766]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  179.680777]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  179.680786]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  179.680806]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  179.680818]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  179.680830]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  179.680841]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  179.680851]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  179.680861]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  179.680875]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  179.680886]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  179.680898]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  179.680911]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  179.680922] ---[ end trace 2e28eec93b7a8b83 ]---
[  199.302239] tty_init_dev: 19 callbacks suppressed
[  300.148171] ------------[ cut here ]------------
[  300.148226] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  300.148255] Modules linked in:
[  300.148278] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  300.148304] Call Trace:
[  300.148318]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  300.148362]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  300.148386]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  300.148415]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  300.148441]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  300.148464]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  300.148488]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  300.148514]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  300.148539]  [<ffffffff81629a77>] neigh_resolve_output+0x127/0x250
[  300.148565]  [<ffffffff816ad1be>] ? ipv4_neigh_lookup+0x3e/0x150
[  300.148588]  [<ffffffff8162ad37>] neigh_update+0x297/0x5e0
[  300.148610]  [<ffffffff8162adc2>] ? neigh_update+0x322/0x5e0
[  300.148633]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  300.148661]  [<ffffffff8106e756>] ? local_bh_enable+0xc6/0x160
[  300.148702]  [<ffffffff816e2f55>] arp_process+0x2e5/0x700
[  300.148725]  [<ffffffff810ad345>] ? debug_check_no_locks_freed+0x115/0x1d0
[  300.148751]  [<ffffffff816e3445>] arp_rcv+0xd5/0x140
[  300.148773]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[  300.148796]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[  300.148820]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  300.148845]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[  300.148870]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[  300.148896]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[  300.148920]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[  300.148947]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[  300.148971]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[  300.148995]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  300.149019]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  300.149042]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  300.149064]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  300.149089]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  300.149113]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  300.149133]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  300.149172]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  300.149198]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  300.149222]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  300.149245]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  300.149267]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  300.149288]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  300.149316]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  300.149340]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  300.149364]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  300.149391]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  300.149413] ---[ end trace 2e28eec93b7a8b84 ]---
[  312.591132] ------------[ cut here ]------------
[  312.591164] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  312.591171] Modules linked in:
[  312.591177] Pid: 2159, comm: sshd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  312.591183] Call Trace:
[  312.591191]  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  312.591213]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  312.591219]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  312.591226]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  312.591233]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  312.591239]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  312.591244]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  312.591251]  [<ffffffff810aa8e5>] ? trace_softirqs_off+0x85/0x1b0
[  312.591259]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  312.591264]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  312.591270]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  312.591276]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  312.591281]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  312.591286]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  312.591293]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  312.591299]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  312.591306]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  312.591312]  [<ffffffff816d19fa>] tcp_write_xmit+0x21a/0xa50
[  312.591317]  [<ffffffff816d225b>] tcp_push_one+0x2b/0x40
[  312.591324]  [<ffffffff816c2dec>] tcp_sendmsg+0x8dc/0xe20
[  312.591331]  [<ffffffff816e8f19>] inet_sendmsg+0xa9/0x100
[  312.591336]  [<ffffffff816e8e70>] ? inet_autobind+0x70/0x70
[  312.591342]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  312.591349]  [<ffffffff8160630d>] sock_aio_write+0x12d/0x140
[  312.591356]  [<ffffffff811435b2>] do_sync_write+0xa2/0xe0
[  312.591365]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  312.591371]  [<ffffffff811441d4>] vfs_write+0x174/0x190
[  312.591376]  [<ffffffff811442fa>] sys_write+0x5a/0xa0
[  312.591383]  [<ffffffff812b33de>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[  312.591391]  [<ffffffff817491cc>] cstar_dispatch+0x7/0x26
[  312.591396] ---[ end trace 2e28eec93b7a8b85 ]---
[  312.591429] ------------[ cut here ]------------
[  312.591435] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  312.591441] Modules linked in:
[  312.591445] Pid: 2159, comm: sshd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  312.591451] Call Trace:
[  312.591457]  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  312.591463]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  312.591468]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  312.591475]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  312.591481]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  312.591487]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  312.591492]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  312.591498]  [<ffffffff810aa8e5>] ? trace_softirqs_off+0x85/0x1b0
[  312.591504]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  312.591510]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  312.591516]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  312.591521]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  312.591526]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  312.591532]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  312.591538]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  312.591544]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  312.591549]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  312.591555]  [<ffffffff816d19fa>] tcp_write_xmit+0x21a/0xa50
[  312.591560]  [<ffffffff816d229d>] __tcp_push_pending_frames+0x2d/0x90
[  312.591566]  [<ffffffff816c2693>] tcp_sendmsg+0x183/0xe20
[  312.591572]  [<ffffffff816e8f19>] inet_sendmsg+0xa9/0x100
[  312.591578]  [<ffffffff816e8e70>] ? inet_autobind+0x70/0x70
[  312.591583]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  312.591588]  [<ffffffff8160630d>] sock_aio_write+0x12d/0x140
[  312.591594]  [<ffffffff811435b2>] do_sync_write+0xa2/0xe0
[  312.591600]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  312.591606]  [<ffffffff811441d4>] vfs_write+0x174/0x190
[  312.591611]  [<ffffffff811442fa>] sys_write+0x5a/0xa0
[  312.591617]  [<ffffffff812b33de>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[  312.591623]  [<ffffffff817491cc>] cstar_dispatch+0x7/0x26
[  312.591627] ---[ end trace 2e28eec93b7a8b86 ]---
[  312.591645] ------------[ cut here ]------------
[  312.591651] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  312.591657] Modules linked in:
[  312.591662] Pid: 2159, comm: sshd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  312.591667] Call Trace:
[  312.591671]  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  312.591677]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  312.591682]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  312.591688]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  312.591694]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  312.591700]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  312.591705]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  312.591711]  [<ffffffff810aa8e5>] ? trace_softirqs_off+0x85/0x1b0
[  312.591717]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  312.591726]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  312.591732]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  312.591737]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  312.591743]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  312.591748]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  312.591754]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  312.591759]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  312.591765]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  312.591770]  [<ffffffff816d19fa>] tcp_write_xmit+0x21a/0xa50
[  312.591776]  [<ffffffff816d229d>] __tcp_push_pending_frames+0x2d/0x90
[  312.591782]  [<ffffffff816c2693>] tcp_sendmsg+0x183/0xe20
[  312.591788]  [<ffffffff816e8f19>] inet_sendmsg+0xa9/0x100
[  312.591793]  [<ffffffff816e8e70>] ? inet_autobind+0x70/0x70
[  312.591799]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  312.591804]  [<ffffffff8160630d>] sock_aio_write+0x12d/0x140
[  312.591810]  [<ffffffff811435b2>] do_sync_write+0xa2/0xe0
[  312.591816]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  312.591822]  [<ffffffff811441d4>] vfs_write+0x174/0x190
[  312.591827]  [<ffffffff811442fa>] sys_write+0x5a/0xa0
[  312.591833]  [<ffffffff812b33de>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[  312.591839]  [<ffffffff817491cc>] cstar_dispatch+0x7/0x26
[  312.591843] ---[ end trace 2e28eec93b7a8b87 ]---
[  313.048431] ------------[ cut here ]------------
[  313.048487] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  313.048514] Modules linked in:
[  313.048536] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  313.048560] Call Trace:
[  313.048573]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  313.048614]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  313.048638]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  313.048665]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  313.048689]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  313.048711]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  313.048734]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  313.048758]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  313.048783]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  313.048806]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  313.048829]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  313.048850]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  313.048872]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  313.048896]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  313.048920]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  313.048943]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  313.048965]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  313.048988]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  313.049011]  [<ffffffff816d167e>] tcp_xmit_retransmit_queue+0x19e/0x300
[  313.049034]  [<ffffffff816c99ff>] tcp_fastretrans_alert+0x94f/0xcb0
[  313.049057]  [<ffffffff816ca70c>] tcp_ack+0x9ac/0x1150
[  313.049079]  [<ffffffff816cd858>] tcp_rcv_established+0x318/0x640
[  313.049102]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  313.049123]  [<ffffffff816d54d5>] tcp_v4_do_rcv+0x135/0x480
[  313.049147]  [<ffffffff817461d2>] ? _raw_spin_lock_nested+0x42/0x50
[  313.049169]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  313.049191]  [<ffffffff816d617d>] tcp_v4_rcv+0x95d/0xb10
[  313.049212]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  313.049233]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  313.049257]  [<ffffffff816b2a6a>] ip_local_deliver_finish+0x11a/0x230
[  313.049280]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  313.049304]  [<ffffffff816b2bb8>] ip_local_deliver+0x38/0x80
[  313.049326]  [<ffffffff816b217a>] ip_rcv_finish+0x15a/0x630
[  313.049347]  [<ffffffff816b2868>] ip_rcv+0x218/0x300
[  313.049368]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[  313.049393]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[  313.049416]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  313.049440]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[  313.049463]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[  313.049486]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[  313.049508]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[  313.049534]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[  313.049557]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[  313.049579]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  313.049602]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  313.049623]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  313.049645]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  313.049668]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  313.049690]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  313.049709]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  313.049745]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  313.049769]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  313.049791]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  313.049812]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  313.049832]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  313.049852]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  313.049878]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  313.049901]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  313.049928]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  313.049952]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  313.049974] ---[ end trace 2e28eec93b7a8b88 ]---
[  313.050054] ------------[ cut here ]------------
[  313.050077] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  313.050102] Modules linked in:
[  313.050121] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  313.050143] Call Trace:
[  313.050153]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  313.050187]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  313.050210]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  313.050234]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  313.050257]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  313.050280]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  313.050302]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  313.050325]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  313.050348]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  313.050373]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  313.050397]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  313.050418]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  313.050439]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  313.050461]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  313.050484]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  313.050506]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  313.050527]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  313.050550]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  313.050574]  [<ffffffff816d167e>] tcp_xmit_retransmit_queue+0x19e/0x300
[  313.050598]  [<ffffffff816c99ff>] tcp_fastretrans_alert+0x94f/0xcb0
[  313.050621]  [<ffffffff816ca70c>] tcp_ack+0x9ac/0x1150
[  313.050643]  [<ffffffff816cd858>] tcp_rcv_established+0x318/0x640
[  313.050666]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  313.050688]  [<ffffffff816d54d5>] tcp_v4_do_rcv+0x135/0x480
[  313.050710]  [<ffffffff817461d2>] ? _raw_spin_lock_nested+0x42/0x50
[  313.050733]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  313.050755]  [<ffffffff816d617d>] tcp_v4_rcv+0x95d/0xb10
[  313.050776]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  313.050797]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  313.050821]  [<ffffffff816b2a6a>] ip_local_deliver_finish+0x11a/0x230
[  313.050844]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  313.050869]  [<ffffffff816b2bb8>] ip_local_deliver+0x38/0x80
[  313.050891]  [<ffffffff816b217a>] ip_rcv_finish+0x15a/0x630
[  313.050913]  [<ffffffff816b2868>] ip_rcv+0x218/0x300
[  313.050934]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[  313.050956]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[  313.050979]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  313.051001]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[  313.051024]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[  313.051047]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[  313.051070]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[  313.051095]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[  313.051117]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[  313.051139]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  313.051161]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  313.051181]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  313.051202]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  313.051223]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  313.051246]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  313.051265]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  313.051301]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  313.051325]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  313.051347]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  313.051369]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  313.051388]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  313.051408]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  313.051432]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  313.051454]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  313.051476]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  313.051503]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  313.051523] ---[ end trace 2e28eec93b7a8b89 ]---
[  313.053645] ------------[ cut here ]------------
[  313.053684] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  313.053707] Modules linked in:
[  313.053729] Pid: 1523, comm: syslogd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  313.053751] Call Trace:
[  313.053762]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  313.053798]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  313.053820]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  313.053845]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  313.053869]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  313.053891]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  313.053913]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  313.053936]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  313.053960]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  313.053985]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  313.054010]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  313.054031]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  313.054053]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  313.054074]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  313.054097]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  313.054120]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  313.054141]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  313.054164]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  313.054186]  [<ffffffff81746cb5>] ? _raw_spin_unlock_irqrestore+0x75/0xa0
[  313.054211]  [<ffffffff816d167e>] tcp_xmit_retransmit_queue+0x19e/0x300
[  313.054234]  [<ffffffff816c99ff>] tcp_fastretrans_alert+0x94f/0xcb0
[  313.054257]  [<ffffffff816ca70c>] tcp_ack+0x9ac/0x1150
[  313.054280]  [<ffffffff816cd8ce>] tcp_rcv_established+0x38e/0x640
[  313.054303]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  313.054325]  [<ffffffff816d54d5>] tcp_v4_do_rcv+0x135/0x480
[  313.054347]  [<ffffffff817461d2>] ? _raw_spin_lock_nested+0x42/0x50
[  313.054370]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  313.054391]  [<ffffffff816d617d>] tcp_v4_rcv+0x95d/0xb10
[  313.054412]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  313.054433]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  313.054458]  [<ffffffff816b2a6a>] ip_local_deliver_finish+0x11a/0x230
[  313.054481]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  313.054505]  [<ffffffff816b2bb8>] ip_local_deliver+0x38/0x80
[  313.054527]  [<ffffffff816b217a>] ip_rcv_finish+0x15a/0x630
[  313.054548]  [<ffffffff816b2868>] ip_rcv+0x218/0x300
[  313.054569]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[  313.054591]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[  313.054613]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  313.054636]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[  313.054659]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[  313.054682]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[  313.054705]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[  313.054730]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[  313.054752]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[  313.054774]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  313.054795]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  313.054816]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  313.054836]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  313.054858]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  313.054881]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  313.054899]  <EOI>  [<ffffffff8100122a>] ? xen_hypercall_xen_version+0xa/0x20
[  313.054937]  [<ffffffff8100122a>] ? xen_hypercall_xen_version+0xa/0x20
[  313.054961]  [<ffffffff8100864d>] ? xen_force_evtchn_callback+0xd/0x10
[  313.054985]  [<ffffffff81008ff2>] ? check_events+0x12/0x20
[  313.055007]  [<ffffffff81008f99>] ? xen_irq_enable_direct_reloc+0x4/0x4
[  313.055031]  [<ffffffff81749146>] ? ia32_cstar_target+0x16/0x8c
[  313.055049] ---[ end trace 2e28eec93b7a8b8a ]---
[  313.055115] ------------[ cut here ]------------
[  313.055137] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  313.055160] Modules linked in:
[  313.055179] Pid: 1523, comm: syslogd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  313.055204] Call Trace:
[  313.055215]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  313.055248]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  313.055271]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  313.055296]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  313.055319]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  313.055342]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  313.055364]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  313.055387]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  313.055411]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  313.055434]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  313.055458]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  313.055479]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  313.055501]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  313.055524]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  313.055547]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  313.055569]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  313.055591]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  313.055615]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  313.055637]  [<ffffffff81746cb5>] ? _raw_spin_unlock_irqrestore+0x75/0xa0
[  313.055662]  [<ffffffff816d167e>] tcp_xmit_retransmit_queue+0x19e/0x300
[  313.055686]  [<ffffffff816c99ff>] tcp_fastretrans_alert+0x94f/0xcb0
[  313.055709]  [<ffffffff816ca70c>] tcp_ack+0x9ac/0x1150
[  313.055732]  [<ffffffff816cd8ce>] tcp_rcv_established+0x38e/0x640
[  313.055760]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  313.055782]  [<ffffffff816d54d5>] tcp_v4_do_rcv+0x135/0x480
[  313.055804]  [<ffffffff817461d2>] ? _raw_spin_lock_nested+0x42/0x50
[  313.055828]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  313.055849]  [<ffffffff816d617d>] tcp_v4_rcv+0x95d/0xb10
[  313.055870]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  313.055892]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  313.055917]  [<ffffffff816b2a6a>] ip_local_deliver_finish+0x11a/0x230
[  313.055940]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  313.055965]  [<ffffffff816b2bb8>] ip_local_deliver+0x38/0x80
[  313.055987]  [<ffffffff816b217a>] ip_rcv_finish+0x15a/0x630
[  313.056009]  [<ffffffff816b2868>] ip_rcv+0x218/0x300
[  313.056030]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[  313.056052]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[  313.056075]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  313.056098]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[  313.056121]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[  313.056145]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[  313.056168]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[  313.056193]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[  313.056216]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[  313.056238]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  313.056260]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  313.056281]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  313.056302]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  313.056324]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  313.056347]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  313.056366]  <EOI>  [<ffffffff8100122a>] ? xen_hypercall_xen_version+0xa/0x20
[  313.056402]  [<ffffffff8100122a>] ? xen_hypercall_xen_version+0xa/0x20
[  313.056427]  [<ffffffff8100864d>] ? xen_force_evtchn_callback+0xd/0x10
[  313.056450]  [<ffffffff81008ff2>] ? check_events+0x12/0x20
[  313.056473]  [<ffffffff81008f99>] ? xen_irq_enable_direct_reloc+0x4/0x4
[  313.056496]  [<ffffffff81749146>] ? ia32_cstar_target+0x16/0x8c
[  313.056515] ---[ end trace 2e28eec93b7a8b8b ]---
[  313.056578] ------------[ cut here ]------------
[  313.056601] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  313.056624] Modules linked in:
[  313.056641] Pid: 1523, comm: syslogd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  313.056664] Call Trace:
[  313.056675]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  313.056708]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  313.056708]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  313.056708]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  313.056708]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  313.056708]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  313.056708]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  313.056708]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  313.056708]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  313.056708]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  313.056708]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  313.056708]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  313.056708]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  313.056708]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  313.056708]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  313.056708]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  313.056708]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  313.056708]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  313.056708]  [<ffffffff81746cb5>] ? _raw_spin_unlock_irqrestore+0x75/0xa0
[  313.056708]  [<ffffffff816d167e>] tcp_xmit_retransmit_queue+0x19e/0x300
[  313.056708]  [<ffffffff816c99ff>] tcp_fastretrans_alert+0x94f/0xcb0
[  313.056708]  [<ffffffff816ca70c>] tcp_ack+0x9ac/0x1150
[  313.056708]  [<ffffffff816cd8ce>] tcp_rcv_established+0x38e/0x640
[  313.056708]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  313.056708]  [<ffffffff816d54d5>] tcp_v4_do_rcv+0x135/0x480
[  313.056708]  [<ffffffff817461d2>] ? _raw_spin_lock_nested+0x42/0x50
[  313.056708]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  313.056708]  [<ffffffff816d617d>] tcp_v4_rcv+0x95d/0xb10
[  313.056708]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  313.056708]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  313.056708]  [<ffffffff816b2a6a>] ip_local_deliver_finish+0x11a/0x230
[  313.056708]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  313.056708]  [<ffffffff816b2bb8>] ip_local_deliver+0x38/0x80
[  313.056708]  [<ffffffff816b217a>] ip_rcv_finish+0x15a/0x630
[  313.056708]  [<ffffffff816b2868>] ip_rcv+0x218/0x300
[  313.056708]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[  313.056708]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[  313.056708]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  313.056708]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[  313.056708]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[  313.056708]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[  313.056708]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[  313.056708]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[  313.056708]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[  313.056708]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  313.056708]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  313.056708]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  313.056708]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  313.056708]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  313.056708]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  313.056708]  <EOI>  [<ffffffff8100122a>] ? xen_hypercall_xen_version+0xa/0x20
[  313.056708]  [<ffffffff8100122a>] ? xen_hypercall_xen_version+0xa/0x20
[  313.056708]  [<ffffffff8100864d>] ? xen_force_evtchn_callback+0xd/0x10
[  313.056708]  [<ffffffff81008ff2>] ? check_events+0x12/0x20
[  313.056708]  [<ffffffff81008f99>] ? xen_irq_enable_direct_reloc+0x4/0x4
[  313.056708]  [<ffffffff81749146>] ? ia32_cstar_target+0x16/0x8c
[  313.056708] ---[ end trace 2e28eec93b7a8b8c ]---
[  313.540200] ------------[ cut here ]------------
[  313.540218] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  313.540240] Modules linked in:
[  313.540246] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  313.540252] Call Trace:
[  313.540256]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  313.540269]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  313.540274]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  313.540283]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  313.540290]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  313.540295]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  313.540301]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  313.540308]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  313.540316]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  313.540321]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  313.540327]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  313.540333]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  313.540338]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  313.540344]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  313.540350]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  313.540357]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  313.540363]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  313.540369]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  313.540375]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  313.540381]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  313.540386]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  313.540392]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  313.540398]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  313.540403]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  313.540408]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  313.540414]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  313.540468]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  313.540475]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  313.540483]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  313.540490]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  313.540495]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  313.540502]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  313.540508]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  313.540513]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  313.540523]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  313.540529]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  313.540535]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  313.540541]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  313.540546]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  313.540551]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  313.540560]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  313.540566]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  313.540571]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  313.540590]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  313.540595] ---[ end trace 2e28eec93b7a8b8d ]---
[  314.516817] ------------[ cut here ]------------
[  314.516845] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  314.516858] Modules linked in:
[  314.516870] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  314.516883] Call Trace:
[  314.516890]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  314.516911]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  314.516923]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  314.516937]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  314.516949]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  314.516960]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  314.516972]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  314.516984]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  314.516999]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  314.517011]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  314.517023]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  314.517033]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  314.517044]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  314.517055]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  314.517067]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  314.517079]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  314.517090]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  314.517102]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  314.517114]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  314.517126]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  314.517138]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  314.517150]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  314.517161]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  314.517171]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  314.517181]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  314.517194]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  314.517205]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  314.517218]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  314.517230]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  314.517241]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  314.517252]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  314.517265]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  314.517277]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  314.517286]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  314.517306]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  314.517318]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  314.517329]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  314.517340]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  314.517351]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  314.517361]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  314.517375]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  314.517386]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  314.517397]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  314.517410]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  314.517421] ---[ end trace 2e28eec93b7a8b8e ]---
[  316.466838] ------------[ cut here ]------------
[  316.466867] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  316.466881] Modules linked in:
[  316.466894] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  316.466906] Call Trace:
[  316.466912]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  316.466934]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  316.466946]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  316.466960]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  316.466973]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  316.466984]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  316.466999]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  316.467012]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  316.467025]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  316.467037]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  316.467049]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  316.467061]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  316.467071]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  316.467083]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  316.467096]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  316.467108]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  316.467119]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  316.467131]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  316.467143]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  316.467155]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  316.467166]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  316.467178]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  316.467190]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  316.467200]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  316.467211]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  316.467223]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  316.467235]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  316.467248]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  316.467260]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  316.467270]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  316.467281]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  316.467293]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  316.467304]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  316.467314]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  316.467334]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  316.467347]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  316.467359]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  316.467369]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  316.467380]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  316.467390]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  316.467403]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  316.467415]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  316.467426]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  316.467439]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  316.467449] ---[ end trace 2e28eec93b7a8b8f ]---
[  320.373445] ------------[ cut here ]------------
[  320.373465] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  320.373472] Modules linked in:
[  320.373478] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  320.373489] Call Trace:
[  320.373492]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  320.373505]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  320.373511]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  320.373519]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  320.373526]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  320.373532]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  320.373538]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  320.373544]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  320.373552]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  320.373557]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  320.373564]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  320.373570]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  320.373575]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  320.373581]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  320.373587]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  320.373594]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  320.373600]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  320.373606]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  320.373613]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  320.373619]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  320.373625]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  320.373631]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  320.373640]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  320.373647]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  320.373653]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  320.373659]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  320.373665]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  320.373672]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  320.373679]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  320.373685]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  320.373690]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  320.373697]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  320.373703]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  320.373708]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  320.373718]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  320.373727]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  320.373733]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  320.373739]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  320.373744]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  320.373749]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  320.373758]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  320.373764]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  320.373769]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  320.373776]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  320.373782] ---[ end trace 2e28eec93b7a8b90 ]---
[  328.186900] ------------[ cut here ]------------
[  328.186948] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  328.186974] Modules linked in:
[  328.186996] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  328.187020] Call Trace:
[  328.187033]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  328.187074]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  328.187097]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  328.187124]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  328.187148]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  328.187171]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  328.187193]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  328.187218]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  328.187242]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  328.187268]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  328.187291]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  328.187316]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  328.187342]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  328.187364]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  328.187389]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  328.187412]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  328.187434]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  328.187457]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  328.187481]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  328.187505]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  328.187528]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  328.187551]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  328.187574]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  328.187594]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  328.187615]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  328.187640]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  328.187663]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  328.187688]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  328.187711]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  328.187732]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  328.187753]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  328.187778]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  328.187801]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  328.187820]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  328.187859]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  328.187883]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  328.187905]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  328.187927]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  328.187947]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  328.187967]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  328.187994]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  328.188017]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  328.188040]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  328.188065]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  328.188087] ---[ end trace 2e28eec93b7a8b91 ]---
[  343.786883] ------------[ cut here ]------------
[  343.786934] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  343.786960] Modules linked in:
[  343.786982] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  343.787006] Call Trace:
[  343.787019]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  343.787060]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  343.787083]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  343.787110]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  343.787135]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  343.787157]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  343.787180]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  343.787203]  [<ffffffff81629a77>] neigh_resolve_output+0x127/0x250
[  343.787229]  [<ffffffff816b96ad>] ip_finish_output+0x39d/0x530
[  343.787252]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  343.787277]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  343.787298]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  343.787320]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  343.787342]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  343.787367]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  343.787390]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  343.787412]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  343.787435]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  343.787459]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  343.787482]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  343.787506]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  343.787529]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  343.787550]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  343.787571]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  343.787591]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  343.787615]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  343.787638]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  343.787663]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  343.787686]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  343.787707]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  343.787729]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  343.787752]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  343.787774]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  343.787793]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  343.787830]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  343.787855]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  343.787877]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  343.787898]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  343.787918]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  343.787938]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  343.787964]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  343.787987]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  343.788011]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  343.788035]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  343.788056] ---[ end trace 2e28eec93b7a8b92 ]---
[  369.138108] ------------[ cut here ]------------
[  369.138148] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  369.138159] Modules linked in:
[  369.138165] Pid: 2169, comm: sshd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  369.138172] Call Trace:
[  369.138179]  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  369.138186]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  369.138191]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  369.138199]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  369.138205]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  369.138211]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  369.138217]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  369.138223]  [<ffffffff810aa8e5>] ? trace_softirqs_off+0x85/0x1b0
[  369.138231]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  369.138236]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  369.138242]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  369.138247]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  369.138253]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  369.138258]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  369.138265]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  369.138271]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  369.138277]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  369.138283]  [<ffffffff816d19fa>] tcp_write_xmit+0x21a/0xa50
[  369.138289]  [<ffffffff816d225b>] tcp_push_one+0x2b/0x40
[  369.138295]  [<ffffffff816c2dec>] tcp_sendmsg+0x8dc/0xe20
[  369.138302]  [<ffffffff816e8f19>] inet_sendmsg+0xa9/0x100
[  369.138307]  [<ffffffff816e8e70>] ? inet_autobind+0x70/0x70
[  369.138312]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  369.138319]  [<ffffffff8160630d>] sock_aio_write+0x12d/0x140
[  369.138326]  [<ffffffff811435b2>] do_sync_write+0xa2/0xe0
[  369.138331]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  369.138337]  [<ffffffff811441d4>] vfs_write+0x174/0x190
[  369.138376]  [<ffffffff811442fa>] sys_write+0x5a/0xa0
[  369.138384]  [<ffffffff812b33de>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[  369.138391]  [<ffffffff817491cc>] cstar_dispatch+0x7/0x26
[  369.138396] ---[ end trace 2e28eec93b7a8b93 ]---
[  369.138422] ------------[ cut here ]------------
[  369.138428] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  369.138435] Modules linked in:
[  369.138439] Pid: 2169, comm: sshd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  369.138445] Call Trace:
[  369.138450]  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  369.138455]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  369.138461]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  369.138468]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  369.138474]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  369.138479]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  369.138485]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  369.138491]  [<ffffffff810aa8e5>] ? trace_softirqs_off+0x85/0x1b0
[  369.138497]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  369.138503]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  369.138509]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  369.138514]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  369.138520]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  369.138525]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  369.138531]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  369.138537]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  369.138542]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  369.138548]  [<ffffffff816d19fa>] tcp_write_xmit+0x21a/0xa50
[  369.138554]  [<ffffffff816d229d>] __tcp_push_pending_frames+0x2d/0x90
[  369.138560]  [<ffffffff816c2693>] tcp_sendmsg+0x183/0xe20
[  369.138566]  [<ffffffff816e8f19>] inet_sendmsg+0xa9/0x100
[  369.138571]  [<ffffffff816e8e70>] ? inet_autobind+0x70/0x70
[  369.138577]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  369.138583]  [<ffffffff8160630d>] sock_aio_write+0x12d/0x140
[  369.138589]  [<ffffffff811435b2>] do_sync_write+0xa2/0xe0
[  369.138594]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  369.138600]  [<ffffffff811441d4>] vfs_write+0x174/0x190
[  369.138605]  [<ffffffff811442fa>] sys_write+0x5a/0xa0
[  369.138611]  [<ffffffff812b33de>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[  369.138617]  [<ffffffff817491cc>] cstar_dispatch+0x7/0x26
[  369.138621] ---[ end trace 2e28eec93b7a8b94 ]---
[  369.138648] ------------[ cut here ]------------
[  369.138653] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  369.138659] Modules linked in:
[  369.138664] Pid: 2169, comm: sshd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  369.138670] Call Trace:
[  369.138674]  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  369.138680]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  369.138686]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  369.138692]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  369.138698]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  369.138704]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  369.138709]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  369.138715]  [<ffffffff810aa8e5>] ? trace_softirqs_off+0x85/0x1b0
[  369.138721]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  369.138727]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  369.138733]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  369.138739]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  369.138744]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  369.138750]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  369.138756]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  369.138762]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  369.138767]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  369.138773]  [<ffffffff816d19fa>] tcp_write_xmit+0x21a/0xa50
[  369.138779]  [<ffffffff816d229d>] __tcp_push_pending_frames+0x2d/0x90
[  369.138785]  [<ffffffff816c2693>] tcp_sendmsg+0x183/0xe20
[  369.138791]  [<ffffffff816e8f19>] inet_sendmsg+0xa9/0x100
[  369.138796]  [<ffffffff816e8e70>] ? inet_autobind+0x70/0x70
[  369.138802]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  369.138808]  [<ffffffff8160630d>] sock_aio_write+0x12d/0x140
[  369.138814]  [<ffffffff811435b2>] do_sync_write+0xa2/0xe0
[  369.138819]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  369.138825]  [<ffffffff811441d4>] vfs_write+0x174/0x190
[  369.138830]  [<ffffffff811442fa>] sys_write+0x5a/0xa0
[  369.138836]  [<ffffffff812b33de>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[  369.138842]  [<ffffffff817491cc>] cstar_dispatch+0x7/0x26
[  369.138847] ---[ end trace 2e28eec93b7a8b95 ]---
[  369.571785] ------------[ cut here ]------------
[  369.571811] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  369.571818] Modules linked in:
[  369.571825] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  369.571832] Call Trace:
[  369.571835]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  369.571848]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  369.571854]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  369.571863]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  369.571871]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  369.571877]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  369.571883]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  369.571890]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  369.571898]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  369.571903]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  369.571909]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  369.571915]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  369.571922]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  369.571927]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  369.571934]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  369.571941]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  369.571947]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  369.571953]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  369.571959]  [<ffffffff816d167e>] tcp_xmit_retransmit_queue+0x19e/0x300
[  369.571965]  [<ffffffff816c99ff>] tcp_fastretrans_alert+0x94f/0xcb0
[  369.571971]  [<ffffffff816ca70c>] tcp_ack+0x9ac/0x1150
[  369.571977]  [<ffffffff816cd858>] tcp_rcv_established+0x318/0x640
[  369.571983]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  369.571989]  [<ffffffff816d54d5>] tcp_v4_do_rcv+0x135/0x480
[  369.571996]  [<ffffffff817461d2>] ? _raw_spin_lock_nested+0x42/0x50
[  369.572002]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  369.572007]  [<ffffffff816d617d>] tcp_v4_rcv+0x95d/0xb10
[  369.572013]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  369.572019]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  369.572026]  [<ffffffff816b2a6a>] ip_local_deliver_finish+0x11a/0x230
[  369.572031]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  369.572037]  [<ffffffff816b2bb8>] ip_local_deliver+0x38/0x80
[  369.572043]  [<ffffffff816b217a>] ip_rcv_finish+0x15a/0x630
[  369.572048]  [<ffffffff816b2868>] ip_rcv+0x218/0x300
[  369.572054]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[  369.572060]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[  369.572066]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  369.572073]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[  369.572080]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[  369.572086]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[  369.572092]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[  369.572098]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[  369.572105]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[  369.572110]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  369.572116]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  369.572124]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  369.572129]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  369.572137]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  369.572143]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  369.572147]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  369.572158]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  369.572165]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  369.572171]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  369.572176]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  369.572186]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  369.572192]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  369.572200]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  369.572206]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  369.572212]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  369.572218]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  369.572224] ---[ end trace 2e28eec93b7a8b96 ]---
[  369.572251] ------------[ cut here ]------------
[  369.572257] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  369.572264] Modules linked in:
[  369.572268] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  369.572274] Call Trace:
[  369.572277]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  369.572286]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  369.572291]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  369.572298]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  369.572304]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  369.572309]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  369.572315]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  369.572321]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  369.572327]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  369.572333]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  369.572339]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  369.572344]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  369.572350]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  369.572355]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  369.572361]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  369.572370]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  369.572376]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  369.572382]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  369.572388]  [<ffffffff816d167e>] tcp_xmit_retransmit_queue+0x19e/0x300
[  369.572394]  [<ffffffff816c99ff>] tcp_fastretrans_alert+0x94f/0xcb0
[  369.572400]  [<ffffffff816ca70c>] tcp_ack+0x9ac/0x1150
[  369.572406]  [<ffffffff816cd858>] tcp_rcv_established+0x318/0x640
[  369.572411]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  369.572417]  [<ffffffff816d54d5>] tcp_v4_do_rcv+0x135/0x480
[  369.572423]  [<ffffffff817461d2>] ? _raw_spin_lock_nested+0x42/0x50
[  369.572429]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  369.572434]  [<ffffffff816d617d>] tcp_v4_rcv+0x95d/0xb10
[  369.572439]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  369.572445]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  369.572451]  [<ffffffff816b2a6a>] ip_local_deliver_finish+0x11a/0x230
[  369.572457]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  369.572463]  [<ffffffff816b2bb8>] ip_local_deliver+0x38/0x80
[  369.572469]  [<ffffffff816b217a>] ip_rcv_finish+0x15a/0x630
[  369.572474]  [<ffffffff816b2868>] ip_rcv+0x218/0x300
[  369.572480]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[  369.572486]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[  369.572492]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  369.572497]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[  369.572503]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[  369.572509]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[  369.572515]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[  369.572521]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[  369.572527]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[  369.572533]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  369.572538]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  369.572543]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  369.572549]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  369.572555]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  369.572560]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  369.572566]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  369.572575]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  369.572581]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  369.572586]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  369.572592]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  369.572597]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  369.572602]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  369.572608]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  369.572614]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  369.572619]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  369.572626]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  369.572631] ---[ end trace 2e28eec93b7a8b97 ]---
[  369.574579] ------------[ cut here ]------------
[  369.574599] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  369.574605] Modules linked in:
[  369.574611] Pid: 1523, comm: syslogd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  369.574617] Call Trace:
[  369.574620]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  369.574629]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  369.574635]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  369.574642]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  369.574648]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  369.574653]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  369.574659]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  369.574665]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  369.574671]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  369.574677]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  369.574683]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  369.574688]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  369.574694]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  369.574699]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  369.574706]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  369.574712]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  369.574718]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  369.574728]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  369.574734]  [<ffffffff81746cb5>] ? _raw_spin_unlock_irqrestore+0x75/0xa0
[  369.574740]  [<ffffffff816d167e>] tcp_xmit_retransmit_queue+0x19e/0x300
[  369.574746]  [<ffffffff816c99ff>] tcp_fastretrans_alert+0x94f/0xcb0
[  369.574752]  [<ffffffff816ca70c>] tcp_ack+0x9ac/0x1150
[  369.574758]  [<ffffffff816cd8ce>] tcp_rcv_established+0x38e/0x640
[  369.574763]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  369.574769]  [<ffffffff816d54d5>] tcp_v4_do_rcv+0x135/0x480
[  369.574775]  [<ffffffff817461d2>] ? _raw_spin_lock_nested+0x42/0x50
[  369.574781]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  369.574786]  [<ffffffff816d617d>] tcp_v4_rcv+0x95d/0xb10
[  369.574792]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  369.574797]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  369.574804]  [<ffffffff816b2a6a>] ip_local_deliver_finish+0x11a/0x230
[  369.574810]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  369.574816]  [<ffffffff816b2bb8>] ip_local_deliver+0x38/0x80
[  369.574821]  [<ffffffff816b217a>] ip_rcv_finish+0x15a/0x630
[  369.574827]  [<ffffffff816b2868>] ip_rcv+0x218/0x300
[  369.574832]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[  369.574838]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[  369.574843]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  369.574850]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[  369.574856]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[  369.574862]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[  369.574867]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[  369.574874]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[  369.574879]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[  369.574885]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  369.574891]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  369.574896]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  369.574901]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  369.574907]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  369.574913]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  369.574918]  <EOI>  [<ffffffff8100122a>] ? xen_hypercall_xen_version+0xa/0x20
[  369.574928]  [<ffffffff8100122a>] ? xen_hypercall_xen_version+0xa/0x20
[  369.574934]  [<ffffffff8100864d>] ? xen_force_evtchn_callback+0xd/0x10
[  369.574940]  [<ffffffff81008ff2>] ? check_events+0x12/0x20
[  369.574946]  [<ffffffff81008fdf>] ? xen_restore_fl_direct_reloc+0x4/0x4
[  369.574952]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  369.574958]  [<ffffffff810f2a40>] ? find_get_pages+0x190/0x190
[  369.574964]  [<ffffffff810f2a82>] ? find_get_page+0x42/0x100
[  369.574969]  [<ffffffff810f2a40>] ? find_get_pages+0x190/0x190
[  369.574975]  [<ffffffff810f2dc1>] ? find_lock_page+0x21/0x80
[  369.574980]  [<ffffffff810f331a>] ? grab_cache_page_write_begin+0x6a/0xe0
[  369.574988]  [<ffffffff811d6df7>] ? ext4_da_write_begin+0x97/0x1a0
[  369.574993]  [<ffffffff810b054b>] ? __lock_acquire+0x46b/0xdd0
[  369.574999]  [<ffffffff8161034c>] ? skb_free_head+0x4c/0x60
[  369.575005]  [<ffffffff810f1ebb>] ? generic_file_buffered_write+0x10b/0x2b0
[  369.575012]  [<ffffffff8106d742>] ? current_fs_time+0x22/0x30
[  369.575017]  [<ffffffff810f409b>] ? __generic_file_aio_write+0x1bb/0x3c0
[  369.575023]  [<ffffffff810f431c>] ? generic_file_aio_write+0x7c/0xf0
[  369.575029]  [<ffffffff811d04c4>] ? ext4_file_write+0x64/0x4c0
[  369.575036]  [<ffffffff8108eb1d>] ? lg_local_unlock+0x3d/0x70
[  369.575042]  [<ffffffff811d0460>] ? ext4_unwritten_wait+0xc0/0xc0
[  369.575049]  [<ffffffff811434cb>] ? do_sync_readv_writev+0x9b/0xe0
[  369.575056]  [<ffffffff8118d07c>] ? compat_do_readv_writev+0x1cc/0x210
[  369.575062]  [<ffffffff81749219>] ? sysretl_from_sys_call+0x2e/0x38
[  369.575068]  [<ffffffff8118d0f7>] ? compat_writev+0x37/0x70
[  369.575074]  [<ffffffff8118d2b4>] ? compat_sys_writev+0x54/0x90
[  369.575079]  [<ffffffff817491cc>] ? cstar_dispatch+0x7/0x26
[  369.575084] ---[ end trace 2e28eec93b7a8b98 ]---
[  369.575105] ------------[ cut here ]------------
[  369.575111] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  369.575117] Modules linked in:
[  369.575122] Pid: 1523, comm: syslogd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  369.575128] Call Trace:
[  369.575130]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  369.575139]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  369.575145]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  369.575151]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  369.575157]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  369.575166]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  369.575172]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  369.575178]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  369.575184]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  369.575190]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  369.575196]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  369.575202]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  369.575207]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  369.575213]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  369.575219]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  369.575225]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  369.575230]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  369.575236]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  369.575242]  [<ffffffff81746cb5>] ? _raw_spin_unlock_irqrestore+0x75/0xa0
[  369.575248]  [<ffffffff816d167e>] tcp_xmit_retransmit_queue+0x19e/0x300
[  369.575255]  [<ffffffff816c99ff>] tcp_fastretrans_alert+0x94f/0xcb0
[  369.575260]  [<ffffffff816ca70c>] tcp_ack+0x9ac/0x1150
[  369.575266]  [<ffffffff816cd8ce>] tcp_rcv_established+0x38e/0x640
[  369.575272]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  369.575278]  [<ffffffff816d54d5>] tcp_v4_do_rcv+0x135/0x480
[  369.575284]  [<ffffffff817461d2>] ? _raw_spin_lock_nested+0x42/0x50
[  369.575289]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  369.575295]  [<ffffffff816d617d>] tcp_v4_rcv+0x95d/0xb10
[  369.575300]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  369.575309]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  369.575316]  [<ffffffff816b2a6a>] ip_local_deliver_finish+0x11a/0x230
[  369.575322]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  369.575328]  [<ffffffff816b2bb8>] ip_local_deliver+0x38/0x80
[  369.575334]  [<ffffffff816b217a>] ip_rcv_finish+0x15a/0x630
[  369.575339]  [<ffffffff816b2868>] ip_rcv+0x218/0x300
[  369.575344]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[  369.575350]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[  369.575356]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  369.575362]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[  369.575369]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[  369.575375]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[  369.575384]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[  369.575391]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[  369.575397]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[  369.575402]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  369.575408]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  369.575413]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  369.575419]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  369.575428]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  369.575434]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  369.575439]  <EOI>  [<ffffffff8100122a>] ? xen_hypercall_xen_version+0xa/0x20
[  369.575448]  [<ffffffff8100122a>] ? xen_hypercall_xen_version+0xa/0x20
[  369.575454]  [<ffffffff8100864d>] ? xen_force_evtchn_callback+0xd/0x10
[  369.575460]  [<ffffffff81008ff2>] ? check_events+0x12/0x20
[  369.575466]  [<ffffffff81008fdf>] ? xen_restore_fl_direct_reloc+0x4/0x4
[  369.575472]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  369.575478]  [<ffffffff810f2a40>] ? find_get_pages+0x190/0x190
[  369.575485]  [<ffffffff810f2a82>] ? find_get_page+0x42/0x100
[  369.575491]  [<ffffffff810f2a40>] ? find_get_pages+0x190/0x190
[  369.575497]  [<ffffffff810f2dc1>] ? find_lock_page+0x21/0x80
[  369.575502]  [<ffffffff810f331a>] ? grab_cache_page_write_begin+0x6a/0xe0
[  369.575508]  [<ffffffff811d6df7>] ? ext4_da_write_begin+0x97/0x1a0
[  369.575514]  [<ffffffff810b054b>] ? __lock_acquire+0x46b/0xdd0
[  369.575520]  [<ffffffff8161034c>] ? skb_free_head+0x4c/0x60
[  369.575526]  [<ffffffff810f1ebb>] ? generic_file_buffered_write+0x10b/0x2b0
[  369.575532]  [<ffffffff8106d742>] ? current_fs_time+0x22/0x30
[  369.575538]  [<ffffffff810f409b>] ? __generic_file_aio_write+0x1bb/0x3c0
[  369.575544]  [<ffffffff810f431c>] ? generic_file_aio_write+0x7c/0xf0
[  369.575550]  [<ffffffff811d04c4>] ? ext4_file_write+0x64/0x4c0
[  369.575556]  [<ffffffff8108eb1d>] ? lg_local_unlock+0x3d/0x70
[  369.575562]  [<ffffffff811d0460>] ? ext4_unwritten_wait+0xc0/0xc0
[  369.575567]  [<ffffffff811434cb>] ? do_sync_readv_writev+0x9b/0xe0
[  369.575574]  [<ffffffff8118d07c>] ? compat_do_readv_writev+0x1cc/0x210
[  369.575582]  [<ffffffff81749219>] ? sysretl_from_sys_call+0x2e/0x38
[  369.575588]  [<ffffffff8118d0f7>] ? compat_writev+0x37/0x70
[  369.575594]  [<ffffffff8118d2b4>] ? compat_sys_writev+0x54/0x90
[  369.575600]  [<ffffffff817491cc>] ? cstar_dispatch+0x7/0x26
[  369.575604] ---[ end trace 2e28eec93b7a8b99 ]---
[  369.575626] ------------[ cut here ]------------
[  369.575632] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  369.575638] Modules linked in:
[  369.575642] Pid: 1523, comm: syslogd Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  369.575648] Call Trace:
[  369.575651]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  369.575660]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  369.575665]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  369.575672]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  369.575678]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  369.575684]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  369.575690]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  369.575696]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  369.575702]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  369.575707]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  369.575714]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  369.575719]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  369.575725]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  369.575730]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  369.575736]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  369.575742]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  369.575748]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  369.575754]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  369.575759]  [<ffffffff81746cb5>] ? _raw_spin_unlock_irqrestore+0x75/0xa0
[  369.575766]  [<ffffffff816d167e>] tcp_xmit_retransmit_queue+0x19e/0x300
[  369.575772]  [<ffffffff816c99ff>] tcp_fastretrans_alert+0x94f/0xcb0
[  369.575778]  [<ffffffff816ca70c>] tcp_ack+0x9ac/0x1150
[  369.575783]  [<ffffffff816cd8ce>] tcp_rcv_established+0x38e/0x640
[  369.575789]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  369.575795]  [<ffffffff816d54d5>] tcp_v4_do_rcv+0x135/0x480
[  369.575803]  [<ffffffff817461d2>] ? _raw_spin_lock_nested+0x42/0x50
[  369.575809]  [<ffffffff816d5eef>] ? tcp_v4_rcv+0x6cf/0xb10
[  369.575815]  [<ffffffff816d617d>] tcp_v4_rcv+0x95d/0xb10
[  369.575823]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  369.575828]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  369.575835]  [<ffffffff816b2a6a>] ip_local_deliver_finish+0x11a/0x230
[  369.575841]  [<ffffffff816b2995>] ? ip_local_deliver_finish+0x45/0x230
[  369.575847]  [<ffffffff816b2bb8>] ip_local_deliver+0x38/0x80
[  369.575852]  [<ffffffff816b217a>] ip_rcv_finish+0x15a/0x630
[  369.575858]  [<ffffffff816b2868>] ip_rcv+0x218/0x300
[  369.575863]  [<ffffffff8161ac8d>] __netif_receive_skb+0x65d/0x8d0
[  369.575869]  [<ffffffff8161a775>] ? __netif_receive_skb+0x145/0x8d0
[  369.575875]  [<ffffffff810ad22d>] ? trace_hardirqs_on+0xd/0x10
[  369.575881]  [<ffffffff810f9973>] ? free_hot_cold_page+0x1b3/0x1e0
[  369.575887]  [<ffffffff8161d1f8>] netif_receive_skb+0x28/0xf0
[  369.575893]  [<ffffffff81612d03>] ? __pskb_pull_tail+0x253/0x340
[  369.576726]  [<ffffffff8146e4c5>] xennet_poll+0xad5/0xe10
[  369.576726]  [<ffffffff8161dfa6>] net_rx_action+0x136/0x260
[  369.576726]  [<ffffffff8106e381>] ? __do_softirq+0x71/0x1a0
[  369.576726]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  369.576726]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  369.576726]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  369.576726]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  369.576726]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  369.576726]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  369.576726]  <EOI>  [<ffffffff8100122a>] ? xen_hypercall_xen_version+0xa/0x20
[  369.576726]  [<ffffffff8100122a>] ? xen_hypercall_xen_version+0xa/0x20
[  369.576726]  [<ffffffff8100864d>] ? xen_force_evtchn_callback+0xd/0x10
[  369.576726]  [<ffffffff81008ff2>] ? check_events+0x12/0x20
[  369.576726]  [<ffffffff81008fdf>] ? xen_restore_fl_direct_reloc+0x4/0x4
[  369.576726]  [<ffffffff810b0f88>] ? lock_acquire+0xd8/0x100
[  369.576726]  [<ffffffff810f2a40>] ? find_get_pages+0x190/0x190
[  369.576726]  [<ffffffff810f2a82>] ? find_get_page+0x42/0x100
[  369.576726]  [<ffffffff810f2a40>] ? find_get_pages+0x190/0x190
[  369.576726]  [<ffffffff810f2dc1>] ? find_lock_page+0x21/0x80
[  369.576726]  [<ffffffff810f331a>] ? grab_cache_page_write_begin+0x6a/0xe0
[  369.576726]  [<ffffffff811d6df7>] ? ext4_da_write_begin+0x97/0x1a0
[  369.576726]  [<ffffffff810b054b>] ? __lock_acquire+0x46b/0xdd0
[  369.576726]  [<ffffffff8161034c>] ? skb_free_head+0x4c/0x60
[  369.576726]  [<ffffffff810f1ebb>] ? generic_file_buffered_write+0x10b/0x2b0
[  369.576726]  [<ffffffff8106d742>] ? current_fs_time+0x22/0x30
[  369.576726]  [<ffffffff810f409b>] ? __generic_file_aio_write+0x1bb/0x3c0
[  369.576726]  [<ffffffff810f431c>] ? generic_file_aio_write+0x7c/0xf0
[  369.576726]  [<ffffffff811d04c4>] ? ext4_file_write+0x64/0x4c0
[  369.576726]  [<ffffffff8108eb1d>] ? lg_local_unlock+0x3d/0x70
[  369.576726]  [<ffffffff811d0460>] ? ext4_unwritten_wait+0xc0/0xc0
[  369.576726]  [<ffffffff811434cb>] ? do_sync_readv_writev+0x9b/0xe0
[  369.576726]  [<ffffffff8118d07c>] ? compat_do_readv_writev+0x1cc/0x210
[  369.576726]  [<ffffffff81749219>] ? sysretl_from_sys_call+0x2e/0x38
[  369.576726]  [<ffffffff8118d0f7>] ? compat_writev+0x37/0x70
[  369.576726]  [<ffffffff8118d2b4>] ? compat_sys_writev+0x54/0x90
[  369.576726]  [<ffffffff817491cc>] ? cstar_dispatch+0x7/0x26
[  369.576726] ---[ end trace 2e28eec93b7a8b9a ]---
[  370.046880] ------------[ cut here ]------------
[  370.046904] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  370.046910] Modules linked in:
[  370.046917] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  370.046923] Call Trace:
[  370.046927]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  370.046939]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  370.046945]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  370.046954]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  370.046961]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  370.046966]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  370.046972]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  370.046979]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  370.046986]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  370.046992]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  370.046998]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  370.047003]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  370.047009]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  370.047014]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  370.047020]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  370.047027]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  370.047033]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  370.047039]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  370.047045]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  370.047051]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  370.047057]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  370.047063]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  370.047068]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  370.047073]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  370.047079]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  370.047085]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  370.047234]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  370.047241]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  370.047248]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  370.047254]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  370.047259]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  370.047266]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  370.047272]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  370.047277]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  370.047287]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  370.047293]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  370.047300]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  370.047305]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  370.047311]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  370.047316]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  370.047325]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  370.047331]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  370.047337]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  370.047343]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  370.047349] ---[ end trace 2e28eec93b7a8b9b ]---
[  370.996789] ------------[ cut here ]------------
[  370.996807] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  370.996814] Modules linked in:
[  370.996820] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  370.996826] Call Trace:
[  370.996829]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  370.996840]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  370.996845]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  370.996852]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  370.996858]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  370.996863]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  370.996868]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  370.996875]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  370.996881]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  370.996886]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  370.996892]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  370.996896]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  370.996901]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  370.996906]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  370.996912]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  370.996926]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  370.996941]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  370.996947]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  370.996953]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  370.996959]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  370.996965]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  370.996971]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  370.996977]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  370.996983]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  370.996988]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  370.996998]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  370.997004]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  370.997011]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  370.997017]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  370.997023]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  370.997029]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  370.997036]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  370.997042]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  370.997046]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  370.997057]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  370.997064]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  370.997070]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  370.997075]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  370.997081]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  370.997093]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  370.997102]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  370.997108]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  370.997114]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  370.997120]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  370.997126] ---[ end trace 2e28eec93b7a8b9c ]---
[  372.893570] ------------[ cut here ]------------
[  372.893594] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  372.893601] Modules linked in:
[  372.893607] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  372.893613] Call Trace:
[  372.893617]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  372.893630]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  372.893636]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  372.893644]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  372.893651]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  372.893657]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  372.893663]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  372.893669]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  372.893676]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  372.893682]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  372.893688]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  372.893694]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  372.893699]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  372.893705]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  372.893711]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  372.893718]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  372.893724]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  372.893730]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  372.893737]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  372.893743]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  372.893748]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  372.893754]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  372.893760]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  372.893765]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  372.893771]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  372.893777]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  372.893939]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  372.893946]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  372.893952]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  372.893958]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  372.893963]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  372.893970]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  372.893976]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  372.893980]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  372.893990]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  372.893997]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  372.894003]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  372.894008]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  372.894014]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  372.894019]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  372.894027]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  372.894036]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  372.894042]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  372.894048]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  372.894054] ---[ end trace 2e28eec93b7a8b9d ]---
[  374.986770] ------------[ cut here ]------------
[  374.986795] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  374.986802] Modules linked in:
[  374.986810] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  374.986816] Call Trace:
[  374.986819]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  374.986833]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  374.986838]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  374.986847]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  374.986854]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  374.986859]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  374.986864]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  374.986871]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  374.986879]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  374.986884]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  374.986890]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  374.986894]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  374.986899]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  374.986904]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  374.986911]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  374.986918]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  374.986926]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  374.986931]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  374.986937]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  374.986942]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  374.986947]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  374.986953]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  374.986958]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  374.986963]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  374.986967]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  374.986973]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  374.986978]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  374.986985]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  374.986991]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  374.986997]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  374.987002]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  374.987009]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  374.987014]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  374.987018]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  374.987028]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  374.987039]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  374.987059]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  374.987064]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  374.987070]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  374.987075]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  374.987084]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  374.987091]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  374.987097]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  374.987104]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  374.987110] ---[ end trace 2e28eec93b7a8b9e ]---
[  376.693529] ------------[ cut here ]------------
[  376.693582] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  376.693607] Modules linked in:
[  376.693630] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  376.693654] Call Trace:
[  376.693666]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  376.693708]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  376.693731]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  376.693758]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  376.693783]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  376.693806]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  376.693828]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  376.693852]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  376.693877]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  376.693902]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  376.693926]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  376.693948]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  376.693970]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  376.693991]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  376.694017]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  376.694040]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  376.694062]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  376.694085]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  376.694110]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  376.694133]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  376.694156]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  376.694179]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  376.694201]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  376.694222]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  376.694242]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  376.694267]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  376.694290]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  376.694315]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  376.694337]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  376.694358]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  376.694380]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  376.694404]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  376.694427]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  376.694446]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  376.694484]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  376.694509]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  376.694531]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  376.694552]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  376.694573]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  376.694594]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  376.694621]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  376.694644]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  376.694666]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  376.694691]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  376.694712] ---[ end trace 2e28eec93b7a8b9f ]---
[  384.293592] ------------[ cut here ]------------
[  384.293622] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  384.293629] Modules linked in:
[  384.293637] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  384.293643] Call Trace:
[  384.293647]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  384.293662]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  384.293667]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  384.293676]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  384.293683]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  384.293689]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  384.293696]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  384.293704]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  384.293711]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  384.293717]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  384.293724]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  384.293729]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  384.293735]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  384.293741]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  384.293747]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  384.293754]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  384.293760]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  384.293767]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  384.293775]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  384.293781]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  384.293787]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  384.293793]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  384.293800]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  384.293805]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  384.293810]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  384.293824]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  384.293830]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  384.293838]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  384.293845]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  384.293851]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  384.293857]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  384.293864]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  384.293870]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  384.293875]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  384.293886]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  384.293893]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  384.293900]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  384.293905]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  384.293911]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  384.293916]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  384.293925]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  384.293932]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  384.293938]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  384.293945]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  384.293950] ---[ end trace 2e28eec93b7a8ba0 ]---
[  399.466773] ------------[ cut here ]------------
[  399.466791] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  399.466798] Modules linked in:
[  399.466804] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  399.466809] Call Trace:
[  399.466813]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  399.466824]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  399.466830]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  399.466837]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  399.466843]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  399.466848]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  399.466853]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  399.466859]  [<ffffffff81629a77>] neigh_resolve_output+0x127/0x250
[  399.466865]  [<ffffffff816b96ad>] ip_finish_output+0x39d/0x530
[  399.466871]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  399.466876]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  399.466881]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  399.466886]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  399.466891]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  399.466896]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  399.466903]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  399.466909]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  399.466914]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  399.466919]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  399.466925]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  399.466930]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  399.466935]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  399.466940]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  399.466945]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  399.466949]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  399.466955]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  399.466960]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  399.466966]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  399.466972]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  399.466977]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  399.466982]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  399.466989]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  399.466994]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  399.466998]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  399.467008]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  399.467013]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  399.467019]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  399.467024]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  399.467028]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  399.467033]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  399.467040]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  399.467045]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  399.467050]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  399.467055]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  399.467060] ---[ end trace 2e28eec93b7a8ba1 ]---
[  429.813440] ------------[ cut here ]------------
[  429.813477] WARNING: at drivers/net/xen-netfront.c:465 xennet_start_xmit+0x7fe/0x860()
[  429.813484] Modules linked in:
[  429.813491] Pid: 0, comm: swapper/0 Tainted: G        W    3.6.0pre-rc1-20121011 #1
[  429.813497] Call Trace:
[  429.813501]  <IRQ>  [<ffffffff810664ea>] warn_slowpath_common+0x7a/0xb0
[  429.813513]  [<ffffffff81066535>] warn_slowpath_null+0x15/0x20
[  429.813519]  [<ffffffff8146d89e>] xennet_start_xmit+0x7fe/0x860
[  429.813527]  [<ffffffff8161f349>] dev_hard_start_xmit+0x209/0x460
[  429.813534]  [<ffffffff8163b036>] sch_direct_xmit+0xf6/0x290
[  429.813539]  [<ffffffff8161f746>] dev_queue_xmit+0x1a6/0x5a0
[  429.813545]  [<ffffffff8161f5a0>] ? dev_hard_start_xmit+0x460/0x460
[  429.813552]  [<ffffffff810b1417>] ? lock_release+0x117/0x250
[  429.813559]  [<ffffffff816b9536>] ip_finish_output+0x226/0x530
[  429.813565]  [<ffffffff816b93dd>] ? ip_finish_output+0xcd/0x530
[  429.813571]  [<ffffffff816b9899>] ip_output+0x59/0xe0
[  429.813576]  [<ffffffff816b83b8>] ip_local_out+0x28/0x90
[  429.813582]  [<ffffffff816b896f>] ip_queue_xmit+0x17f/0x4a0
[  429.813588]  [<ffffffff816b87f0>] ? ip_send_unicast_reply+0x340/0x340
[  429.813594]  [<ffffffff810a0ba7>] ? getnstimeofday+0x47/0xe0
[  429.813600]  [<ffffffff8160f4c9>] ? __skb_clone+0x29/0x120
[  429.813606]  [<ffffffff816cea20>] tcp_transmit_skb+0x400/0x8d0
[  429.813614]  [<ffffffff816d1106>] tcp_retransmit_skb+0x1c6/0x5a0
[  429.813623]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  429.813631]  [<ffffffff816d2f38>] tcp_retransmit_timer+0x358/0x630
[  429.813637]  [<ffffffff816d334d>] tcp_write_timer_handler+0x13d/0x1a0
[  429.813643]  [<ffffffff816d3428>] tcp_write_timer+0x78/0x80
[  429.813649]  [<ffffffff81073f7c>] call_timer_fn+0x7c/0x100
[  429.813654]  [<ffffffff81073f00>] ? cascade+0xa0/0xa0
[  429.813659]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  429.813665]  [<ffffffff816d33b0>] ? tcp_write_timer_handler+0x1a0/0x1a0
[  429.813728]  [<ffffffff81074217>] run_timer_softirq+0x217/0x250
[  429.813735]  [<ffffffff8106e3d9>] __do_softirq+0xc9/0x1a0
[  429.813742]  [<ffffffff81748d3c>] call_softirq+0x1c/0x30
[  429.813749]  [<ffffffff8100edb5>] do_softirq+0x85/0xf0
[  429.813754]  [<ffffffff8106e24e>] irq_exit+0x9e/0xd0
[  429.813762]  [<ffffffff81339f5f>] xen_evtchn_do_upcall+0x2f/0x40
[  429.813767]  [<ffffffff81748d9e>] xen_do_hypervisor_callback+0x1e/0x30
[  429.813772]  <EOI>  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  429.813783]  [<ffffffff810013aa>] ? xen_hypercall_sched_op+0xa/0x20
[  429.813789]  [<ffffffff81008690>] ? xen_safe_halt+0x10/0x20
[  429.813795]  [<ffffffff810160d0>] ? default_idle+0x40/0x90
[  429.813801]  [<ffffffff81016486>] ? cpu_idle+0x96/0xf0
[  429.813807]  [<ffffffff81722d3c>] ? rest_init+0xbc/0xd0
[  429.813813]  [<ffffffff81722c80>] ? csum_partial_copy_generic+0x170/0x170
[  429.813821]  [<ffffffff81ce0df2>] ? start_kernel+0x390/0x39d
[  429.813827]  [<ffffffff81ce0882>] ? kernel_init+0x20b/0x20b
[  429.813833]  [<ffffffff81ce0356>] ? x86_64_start_reservations+0x131/0x136
[  429.813839]  [<ffffffff81ce3d60>] ? xen_start_kernel+0x70d/0x70f
[  429.813845] ---[ end trace 2e28eec93b7a8ba2 ]---
Eric Dumazet - Oct. 11, 2012, 10:05 a.m.
On Thu, 2012-10-11 at 12:00 +0200, Sander Eikelenboom wrote:

> Probably due to the BUG_ON from the patch below, i changed it into a WARN_ON.
> And i seem to hit it, but only in one of the guests at the moment and it triggers quite irregularly.

xennet_make_frags() is able to split the skb->head in multiple page-size
chunks.

It should do the same for fragments


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Ian Campbell - Oct. 11, 2012, 10:14 a.m.
On Thu, 2012-10-11 at 11:05 +0100, Eric Dumazet wrote:
> On Thu, 2012-10-11 at 12:00 +0200, Sander Eikelenboom wrote:
> 
> > Probably due to the BUG_ON from the patch below, i changed it into a WARN_ON.
> > And i seem to hit it, but only in one of the guests at the moment and it triggers quite irregularly.
> 
> xennet_make_frags() is able to split the skb->head in multiple page-size
> chunks.
> 
> It should do the same for fragments

Right, I just want to be reproduce the issue so I can know I've fixed it
properly ;-)

Ian.



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Sander Eikelenboom - Oct. 11, 2012, 10:20 a.m.
Thursday, October 11, 2012, 12:14:54 PM, you wrote:

> On Thu, 2012-10-11 at 11:05 +0100, Eric Dumazet wrote:
>> On Thu, 2012-10-11 at 12:00 +0200, Sander Eikelenboom wrote:
>> 
>> > Probably due to the BUG_ON from the patch below, i changed it into a WARN_ON.
>> > And i seem to hit it, but only in one of the guests at the moment and it triggers quite irregularly.
>> 
>> xennet_make_frags() is able to split the skb->head in multiple page-size
>> chunks.
>> 
>> It should do the same for fragments

> Right, I just want to be reproduce the issue so I can know I've fixed it
> properly ;-)

Trying to scp/sftp files from a guest seems to trigger it for me ..

> Ian.





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annie.li@oracle.com - Nov. 15, 2012, 2:31 a.m.
On 2012-10-11 18:14, Ian Campbell wrote:
> On Thu, 2012-10-11 at 11:05 +0100, Eric Dumazet wrote:
>> On Thu, 2012-10-11 at 12:00 +0200, Sander Eikelenboom wrote:
>>
>>> Probably due to the BUG_ON from the patch below, i changed it into a WARN_ON.
>>> And i seem to hit it, but only in one of the guests at the moment and it triggers quite irregularly.
>> xennet_make_frags() is able to split the skb->head in multiple page-size
>> chunks.
>>
>> It should do the same for fragments
> Right, I just want to be reproduce the issue so I can know I've fixed it
> properly ;-)
Hi Ian,

I can reproduce this BUG_ON when running netperf/netserver test between 
two domus running on the same dom0. The domu and dom0 all use v3.7-rc1.

When I tried to rebase my persistent grant netfront/netback patch on 
latest kernel, netperf/netserver test never succeeded. I did some test 
to find out that v3.6-rc7 works fine, but v3.7-rc1, v3.7-rc2 and 
v3.7-rc4 does not succeed in netperf/netserver test. So I keep my 
persistent grant patch only based on v3.4-rc3 now.

Konrad thought about commit 6a8ed462f16b8455eec5ae00eb6014159a6721f0 in 
v3.7-rc1, and suggested me to test your debug patch in netfront. This 
BUG_ON happens soon after running the netperf/netserver test case.

Thanks
Annie
>
> Ian.
>
>
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
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Sander Eikelenboom - Nov. 19, 2012, 3:43 p.m.
Thursday, November 15, 2012, 3:31:42 AM, you wrote:

> On 2012-10-11 18:14, Ian Campbell wrote:
>> On Thu, 2012-10-11 at 11:05 +0100, Eric Dumazet wrote:
>>> On Thu, 2012-10-11 at 12:00 +0200, Sander Eikelenboom wrote:
>>>
>>>> Probably due to the BUG_ON from the patch below, i changed it into a WARN_ON.
>>>> And i seem to hit it, but only in one of the guests at the moment and it triggers quite irregularly.
>>> xennet_make_frags() is able to split the skb->head in multiple page-size
>>> chunks.
>>>
>>> It should do the same for fragments
>> Right, I just want to be reproduce the issue so I can know I've fixed it
>> properly ;-)
> Hi Ian,

> I can reproduce this BUG_ON when running netperf/netserver test between 
> two domus running on the same dom0. The domu and dom0 all use v3.7-rc1.

> When I tried to rebase my persistent grant netfront/netback patch on 
> latest kernel, netperf/netserver test never succeeded. I did some test 
> to find out that v3.6-rc7 works fine, but v3.7-rc1, v3.7-rc2 and 
> v3.7-rc4 does not succeed in netperf/netserver test. So I keep my 
> persistent grant patch only based on v3.4-rc3 now.

> Konrad thought about commit 6a8ed462f16b8455eec5ae00eb6014159a6721f0 in 
> v3.7-rc1, and suggested me to test your debug patch in netfront. This 
> BUG_ON happens soon after running the netperf/netserver test case.

> Thanks
> Annie

Is there any progression with this bug (rc6 is out the door, so the release of 3.7-final seems to be eminent and this bug completely cripples any networking with guests) ?

--
Sander

>>
>> Ian.
>>
>>
>>
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@lists.xen.org
>> http://lists.xen.org/xen-devel


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Stefan Bader - Nov. 20, 2012, 8:30 a.m.
On 19.11.2012 16:43, Sander Eikelenboom wrote:
> 
> Thursday, November 15, 2012, 3:31:42 AM, you wrote:
> 
>> On 2012-10-11 18:14, Ian Campbell wrote:
>>> On Thu, 2012-10-11 at 11:05 +0100, Eric Dumazet wrote:
>>>> On Thu, 2012-10-11 at 12:00 +0200, Sander Eikelenboom wrote:
>>>>
>>>>> Probably due to the BUG_ON from the patch below, i changed it into a WARN_ON.
>>>>> And i seem to hit it, but only in one of the guests at the moment and it triggers quite irregularly.
>>>> xennet_make_frags() is able to split the skb->head in multiple page-size
>>>> chunks.
>>>>
>>>> It should do the same for fragments
>>> Right, I just want to be reproduce the issue so I can know I've fixed it
>>> properly ;-)
>> Hi Ian,
> 
>> I can reproduce this BUG_ON when running netperf/netserver test between 
>> two domus running on the same dom0. The domu and dom0 all use v3.7-rc1.
> 
>> When I tried to rebase my persistent grant netfront/netback patch on 
>> latest kernel, netperf/netserver test never succeeded. I did some test 
>> to find out that v3.6-rc7 works fine, but v3.7-rc1, v3.7-rc2 and 
>> v3.7-rc4 does not succeed in netperf/netserver test. So I keep my 
>> persistent grant patch only based on v3.4-rc3 now.
> 
>> Konrad thought about commit 6a8ed462f16b8455eec5ae00eb6014159a6721f0 in 
>> v3.7-rc1, and suggested me to test your debug patch in netfront. This 
>> BUG_ON happens soon after running the netperf/netserver test case.
> 
>> Thanks
>> Annie
> 
> Is there any progression with this bug (rc6 is out the door, so the release of 3.7-final seems to be eminent and this bug completely cripples any networking with guests) ?
> 

+1 on that. I was testing yesterday with a PVM domU running 3.7-rc5 on Xen 4.2
(but also reported from EC2 running Xen 3.4.3) c with one VCPU. I actually can
trigger it by just ssh'ing into the domU (from another machine) and then run
"find /". Output starts to stutter and then stops completely. When this happens
a new connection still can be made and as long as only shorter output is
generated the ssh connection is ok. From a dump taken it looks like user-space
is waiting in some select call (without any warnon I rather won't see the tx path).

-Stefan
Ian Campbell - Nov. 20, 2012, 9:21 a.m.
On Tue, 2012-11-20 at 08:30 +0000, Stefan Bader wrote:
> >> When I tried to rebase my persistent grant netfront/netback patch on 
> >> latest kernel, netperf/netserver test never succeeded. I did some test 
> >> to find out that v3.6-rc7 works fine, but v3.7-rc1, v3.7-rc2 and 
> >> v3.7-rc4 does not succeed in netperf/netserver test. So I keep my 
> >> persistent grant patch only based on v3.4-rc3 now.
> > 
> >> Konrad thought about commit 6a8ed462f16b8455eec5ae00eb6014159a6721f0 in 
> >> v3.7-rc1, and suggested me to test your debug patch in netfront. This 
> >> BUG_ON happens soon after running the netperf/netserver test case.
> > 
> >> Thanks
> >> Annie
> > 
> > Is there any progression with this bug (rc6 is out the door, so the
> release of 3.7-final seems to be eminent and this bug completely
> cripples any networking with guests) ?
> > 
> 
> +1 on that. I was testing yesterday with a PVM domU running 3.7-rc5 on Xen 4.2
> (but also reported from EC2 running Xen 3.4.3) c with one VCPU. I actually can
> trigger it by just ssh'ing into the domU (from another machine) and then run
> "find /". Output starts to stutter and then stops completely. When this happens
> a new connection still can be made and as long as only shorter output is
> generated the ssh connection is ok. From a dump taken it looks like user-space
> is waiting in some select call (without any warnon I rather won't see the tx path).

Annie, are you still looking into this or shall I?

Ian.


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Ian Campbell - Nov. 20, 2012, 11:36 a.m.
On Tue, 2012-11-20 at 09:21 +0000, Ian Campbell wrote:
> On Tue, 2012-11-20 at 08:30 +0000, Stefan Bader wrote:
> > >> When I tried to rebase my persistent grant netfront/netback patch on 
> > >> latest kernel, netperf/netserver test never succeeded. I did some test 
> > >> to find out that v3.6-rc7 works fine, but v3.7-rc1, v3.7-rc2 and 
> > >> v3.7-rc4 does not succeed in netperf/netserver test. So I keep my 
> > >> persistent grant patch only based on v3.4-rc3 now.
> > > 
> > >> Konrad thought about commit 6a8ed462f16b8455eec5ae00eb6014159a6721f0 in 
> > >> v3.7-rc1, and suggested me to test your debug patch in netfront. This 
> > >> BUG_ON happens soon after running the netperf/netserver test case.
> > > 
> > >> Thanks
> > >> Annie
> > > 
> > > Is there any progression with this bug (rc6 is out the door, so the
> > release of 3.7-final seems to be eminent and this bug completely
> > cripples any networking with guests) ?
> > > 
> > 
> > +1 on that. I was testing yesterday with a PVM domU running 3.7-rc5 on Xen 4.2
> > (but also reported from EC2 running Xen 3.4.3) c with one VCPU. I actually can
> > trigger it by just ssh'ing into the domU (from another machine) and then run
> > "find /". Output starts to stutter and then stops completely. When this happens
> > a new connection still can be made and as long as only shorter output is
> > generated the ssh connection is ok. From a dump taken it looks like user-space
> > is waiting in some select call (without any warnon I rather won't see the tx path).
> 
> Annie, are you still looking into this or shall I?

I'll assume that silence == No. Will post a patch shortly.

Ian.

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annie.li@oracle.com - Nov. 21, 2012, 2:42 a.m.
On 2012-11-20 19:36, Ian Campbell wrote:
> On Tue, 2012-11-20 at 09:21 +0000, Ian Campbell wrote:
>> On Tue, 2012-11-20 at 08:30 +0000, Stefan Bader wrote:
>>>>> When I tried to rebase my persistent grant netfront/netback patch on
>>>>> latest kernel, netperf/netserver test never succeeded. I did some test
>>>>> to find out that v3.6-rc7 works fine, but v3.7-rc1, v3.7-rc2 and
>>>>> v3.7-rc4 does not succeed in netperf/netserver test. So I keep my
>>>>> persistent grant patch only based on v3.4-rc3 now.
>>>>> Konrad thought about commit 6a8ed462f16b8455eec5ae00eb6014159a6721f0 in
>>>>> v3.7-rc1, and suggested me to test your debug patch in netfront. This
>>>>> BUG_ON happens soon after running the netperf/netserver test case.
>>>>> Thanks
>>>>> Annie
>>>> Is there any progression with this bug (rc6 is out the door, so the
>>> release of 3.7-final seems to be eminent and this bug completely
>>> cripples any networking with guests) ?
>>> +1 on that. I was testing yesterday with a PVM domU running 3.7-rc5 on Xen 4.2
>>> (but also reported from EC2 running Xen 3.4.3) c with one VCPU. I actually can
>>> trigger it by just ssh'ing into the domU (from another machine) and then run
>>> "find /". Output starts to stutter and then stops completely. When this happens
>>> a new connection still can be made and as long as only shorter output is
>>> generated the ssh connection is ok. From a dump taken it looks like user-space
>>> is waiting in some select call (without any warnon I rather won't see the tx path).
>> Annie, are you still looking into this or shall I?
> I'll assume that silence == No. Will post a patch shortly.
Sorry for the delay response, I did create a patch, but did not post it 
out in time.

Thanks
Annie
> Ian.
>
>
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> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
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Patch

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index b06ef81..8a3f770 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -462,6 +462,8 @@  static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev,
 		ref = gnttab_claim_grant_reference(&np->gref_tx_head);
 		BUG_ON((signed short)ref < 0);
 
+		BUG_ON(PageCompound(skb_frag_page(frag)));
+
 		mfn = pfn_to_mfn(page_to_pfn(skb_frag_page(frag)));
 		gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id,
 						mfn, GNTMAP_readonly);