| Message ID | 20180514155947.22753-2-npiggin@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | c0beffc4f4c658fde86d52c837e784326e9cc875 |
| Headers | show |
| Series | sleeping functions in invalid context on panic fixes | expand |
On Mon, 2018-05-14 at 15:59:46 UTC, Nicholas Piggin wrote: > A kernel crash in process context that calls emergency_restart from > panic will end up calling opal_event_shutdown with interrupts disabled > but not in interrupt. This causes a sleeping function to be called > which gives the following warning with sysrq+c: > > Rebooting in 10 seconds.. > BUG: sleeping function called from invalid context at kernel/locking/mutex.c:238 > in_atomic(): 0, irqs_disabled(): 1, pid: 7669, name: bash > CPU: 20 PID: 7669 Comm: bash Tainted: G D W 4.17.0-rc5+ #3 > Call Trace: > dump_stack+0xb0/0xf4 (unreliable) > ___might_sleep+0x174/0x1a0 > mutex_lock+0x38/0xb0 > __free_irq+0x68/0x460 > free_irq+0x70/0xc0 > opal_event_shutdown+0xb4/0xf0 > opal_shutdown+0x24/0xa0 > pnv_shutdown+0x28/0x40 > machine_shutdown+0x44/0x60 > machine_restart+0x28/0x80 > emergency_restart+0x30/0x50 > panic+0x2a0/0x328 > oops_end+0x1ec/0x1f0 > bad_page_fault+0xe8/0x154 > handle_page_fault+0x34/0x38 > --- interrupt: 300 at sysrq_handle_crash+0x44/0x60 > LR = __handle_sysrq+0xfc/0x260 > flag_spec.62335+0x12b844/0x1e8db4 (unreliable) > __handle_sysrq+0xfc/0x260 > write_sysrq_trigger+0xa8/0xb0 > proc_reg_write+0xac/0x110 > __vfs_write+0x6c/0x240 > vfs_write+0xd0/0x240 > ksys_write+0x6c/0x110 > > Fixes: 9f0fd0499d30 ("powerpc/powernv: Add a virtual irqchip for opal events") > Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/c0beffc4f4c658fde86d52c837e784 cheers
diff --git a/arch/powerpc/platforms/powernv/opal-irqchip.c b/arch/powerpc/platforms/powernv/opal-irqchip.c index 9d1b8c0aaf93..05ffe05f0fdc 100644 --- a/arch/powerpc/platforms/powernv/opal-irqchip.c +++ b/arch/powerpc/platforms/powernv/opal-irqchip.c @@ -177,7 +177,7 @@ void opal_event_shutdown(void) if (!opal_irqs[i]) continue; - if (in_interrupt()) + if (in_interrupt() || irqs_disabled()) disable_irq_nosync(opal_irqs[i]); else free_irq(opal_irqs[i], NULL);
A kernel crash in process context that calls emergency_restart from panic will end up calling opal_event_shutdown with interrupts disabled but not in interrupt. This causes a sleeping function to be called which gives the following warning with sysrq+c: Rebooting in 10 seconds.. BUG: sleeping function called from invalid context at kernel/locking/mutex.c:238 in_atomic(): 0, irqs_disabled(): 1, pid: 7669, name: bash CPU: 20 PID: 7669 Comm: bash Tainted: G D W 4.17.0-rc5+ #3 Call Trace: dump_stack+0xb0/0xf4 (unreliable) ___might_sleep+0x174/0x1a0 mutex_lock+0x38/0xb0 __free_irq+0x68/0x460 free_irq+0x70/0xc0 opal_event_shutdown+0xb4/0xf0 opal_shutdown+0x24/0xa0 pnv_shutdown+0x28/0x40 machine_shutdown+0x44/0x60 machine_restart+0x28/0x80 emergency_restart+0x30/0x50 panic+0x2a0/0x328 oops_end+0x1ec/0x1f0 bad_page_fault+0xe8/0x154 handle_page_fault+0x34/0x38 --- interrupt: 300 at sysrq_handle_crash+0x44/0x60 LR = __handle_sysrq+0xfc/0x260 flag_spec.62335+0x12b844/0x1e8db4 (unreliable) __handle_sysrq+0xfc/0x260 write_sysrq_trigger+0xa8/0xb0 proc_reg_write+0xac/0x110 __vfs_write+0x6c/0x240 vfs_write+0xd0/0x240 ksys_write+0x6c/0x110 Fixes: 9f0fd0499d30 ("powerpc/powernv: Add a virtual irqchip for opal events") Signed-off-by: Nicholas Piggin <npiggin@gmail.com> --- arch/powerpc/platforms/powernv/opal-irqchip.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)