Message ID | 1471532331-21138-1-git-send-email-tim.gardner@canonical.com |
---|---|
State | New |
Headers | show |
On Thu, Aug 18, 2016 at 08:58:51AM -0600, Tim Gardner wrote: > From: Jan Kara <jack@suse.cz> > > BugLink: http://bugs.launchpad.net/bugs/1614565 > > Currently we take care to handle I_DIRTY_TIME in vfs_fsync() and > queue_io() so that inodes which have only dirty timestamps are properly > written on fsync(2) and sync(2). However there are other call sites - > most notably going through write_inode_now() - which expect inode to be > clean after WB_SYNC_ALL writeback. This is not currently true as we do > not clear I_DIRTY_TIME in __writeback_single_inode() even for > WB_SYNC_ALL writeback in all the cases. This then resulted in the > following oops because bdev_write_inode() did not clean the inode and > writeback code later stumbled over a dirty inode with detached wb. > > general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN > Modules linked in: > CPU: 3 PID: 32 Comm: kworker/u10:1 Not tainted 4.6.0-rc3+ #349 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > Workqueue: writeback wb_workfn (flush-11:0) > task: ffff88006ccf1840 ti: ffff88006cda8000 task.ti: ffff88006cda8000 > RIP: 0010:[<ffffffff818884d2>] [<ffffffff818884d2>] > locked_inode_to_wb_and_lock_list+0xa2/0x750 > RSP: 0018:ffff88006cdaf7d0 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88006ccf2050 > RDX: 0000000000000000 RSI: 000000114c8a8484 RDI: 0000000000000286 > RBP: ffff88006cdaf820 R08: ffff88006ccf1840 R09: 0000000000000000 > R10: 000229915090805f R11: 0000000000000001 R12: ffff88006a72f5e0 > R13: dffffc0000000000 R14: ffffed000d4e5eed R15: ffffffff8830cf40 > FS: 0000000000000000(0000) GS:ffff88006d500000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000003301bf8 CR3: 000000006368f000 CR4: 00000000000006e0 > DR0: 0000000000001ec9 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 > Stack: > ffff88006a72f680 ffff88006a72f768 ffff8800671230d8 03ff88006cdaf948 > ffff88006a72f668 ffff88006a72f5e0 ffff8800671230d8 ffff88006cdaf948 > ffff880065b90cc8 ffff880067123100 ffff88006cdaf970 ffffffff8188e12e > Call Trace: > [< inline >] inode_to_wb_and_lock_list fs/fs-writeback.c:309 > [<ffffffff8188e12e>] writeback_sb_inodes+0x4de/0x1250 fs/fs-writeback.c:1554 > [<ffffffff8188efa4>] __writeback_inodes_wb+0x104/0x1e0 fs/fs-writeback.c:1600 > [<ffffffff8188f9ae>] wb_writeback+0x7ce/0xc90 fs/fs-writeback.c:1709 > [< inline >] wb_do_writeback fs/fs-writeback.c:1844 > [<ffffffff81891079>] wb_workfn+0x2f9/0x1000 fs/fs-writeback.c:1884 > [<ffffffff813bcd1e>] process_one_work+0x78e/0x15c0 kernel/workqueue.c:2094 > [<ffffffff813bdc2b>] worker_thread+0xdb/0xfc0 kernel/workqueue.c:2228 > [<ffffffff813cdeef>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303 > [<ffffffff867bc5d2>] ret_from_fork+0x22/0x50 arch/x86/entry/entry_64.S:392 > Code: 05 94 4a a8 06 85 c0 0f 85 03 03 00 00 e8 07 15 d0 ff 41 80 3e > 00 0f 85 64 06 00 00 49 8b 9c 24 88 01 00 00 48 89 d8 48 c1 e8 03 <42> > 80 3c 28 00 0f 85 17 06 00 00 48 8b 03 48 83 c0 50 48 39 c3 > RIP [< inline >] wb_get include/linux/backing-dev-defs.h:212 > RIP [<ffffffff818884d2>] locked_inode_to_wb_and_lock_list+0xa2/0x750 > fs/fs-writeback.c:281 > RSP <ffff88006cdaf7d0> > ---[ end trace 986a4d314dcb2694 ]--- > > Fix the problem by making sure __writeback_single_inode() writes inode > only with dirty times in WB_SYNC_ALL mode. > > Reported-by: Dmitry Vyukov <dvyukov@google.com> > Tested-by: Laurent Dufour <ldufour@linux.vnet.ibm.com> > Signed-off-by: Jan Kara <jack@suse.cz> > Signed-off-by: Jens Axboe <axboe@fb.com> > (cherry picked from commit dc5ff2b1d66f21c27a4c37236636dff6946437e4) > Signed-off-by: Tim Gardner <tim.gardner@canonical.com> > --- > fs/fs-writeback.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c > index 60d6fc2..337afad 100644 > --- a/fs/fs-writeback.c > +++ b/fs/fs-writeback.c > @@ -1292,6 +1292,7 @@ __writeback_single_inode(struct inode *inode, struct writeback_control *wbc) > dirty = inode->i_state & I_DIRTY; > if (inode->i_state & I_DIRTY_TIME) { > if ((dirty & (I_DIRTY_SYNC | I_DIRTY_DATASYNC)) || > + wbc->sync_mode == WB_SYNC_ALL || > unlikely(inode->i_state & I_DIRTY_TIME_EXPIRED) || > unlikely(time_after(jiffies, > (inode->dirtied_time_when + > -- > 2.7.4 > > > -- > kernel-team mailing list > kernel-team@lists.ubuntu.com > https://lists.ubuntu.com/mailman/listinfo/kernel-team
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 60d6fc2..337afad 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -1292,6 +1292,7 @@ __writeback_single_inode(struct inode *inode, struct writeback_control *wbc) dirty = inode->i_state & I_DIRTY; if (inode->i_state & I_DIRTY_TIME) { if ((dirty & (I_DIRTY_SYNC | I_DIRTY_DATASYNC)) || + wbc->sync_mode == WB_SYNC_ALL || unlikely(inode->i_state & I_DIRTY_TIME_EXPIRED) || unlikely(time_after(jiffies, (inode->dirtied_time_when +