linux-kernel - Re: [patch] rt,blk,mq: Make blk_mq_cpu_notify

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Date:	Mon, 03 Mar 2014 09:34:22 -0700
From:	Jens Axboe <axboe@...nel.dk>
To:	Mike Galbraith <bitbucket@...ine.de>
CC:	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>
Subject: Re: [patch] rt,blk,mq: Make blk_mq_cpu_notify_lock a raw spinlock

On 03/02/2014 09:57 PM, Mike Galbraith wrote:
>
> [  365.164040] BUG: sleeping function called from invalid context at kernel/rtmutex.c:674
> [  365.164041] in_atomic(): 1, irqs_disabled(): 1, pid: 26, name: migration/1
> [  365.164043] no locks held by migration/1/26.
> [  365.164044] irq event stamp: 6648
> [  365.164056] hardirqs last  enabled at (6647): [<ffffffff8153d377>] restore_args+0x0/0x30
> [  365.164062] hardirqs last disabled at (6648): [<ffffffff810ed98d>] multi_cpu_stop+0x9d/0x120
> [  365.164070] softirqs last  enabled at (0): [<ffffffff810543bc>] copy_process.part.28+0x6fc/0x1920
> [  365.164072] softirqs last disabled at (0): [<          (null)>]           (null)
> [  365.164076] CPU: 1 PID: 26 Comm: migration/1 Tainted: GF           N  3.12.12-rt19-0.gcb6c4a2-rt #3
> [  365.164078] Hardware name: QCI QSSC-S4R/QSSC-S4R, BIOS QSSC-S4R.QCI.01.00.S013.032920111005 03/29/2011
> [  365.164091]  0000000000000001 ffff880a42ea7c30 ffffffff815367e6 ffffffff81a086c0
> [  365.164099]  ffff880a42ea7c40 ffffffff8108919c ffff880a42ea7c60 ffffffff8153c24f
> [  365.164107]  ffff880a42ea91f0 00000000ffffffe1 ffff880a42ea7c88 ffffffff81297ec0
> [  365.164108] Call Trace:
> [  365.164119]  [<ffffffff810060b1>] try_stack_unwind+0x191/0x1a0
> [  365.164127]  [<ffffffff81004872>] dump_trace+0x92/0x360
> [  365.164133]  [<ffffffff81006108>] show_trace_log_lvl+0x48/0x60
> [  365.164138]  [<ffffffff81004c18>] show_stack_log_lvl+0xd8/0x1d0
> [  365.164143]  [<ffffffff81006160>] show_stack+0x20/0x50
> [  365.164153]  [<ffffffff815367e6>] dump_stack+0x54/0x9a
> [  365.164163]  [<ffffffff8108919c>] __might_sleep+0xfc/0x140
> [  365.164173]  [<ffffffff8153c24f>] rt_spin_lock+0x1f/0x70
> [  365.164182]  [<ffffffff81297ec0>] blk_mq_main_cpu_notify+0x20/0x70
> [  365.164191]  [<ffffffff81540a1c>] notifier_call_chain+0x4c/0x70
> [  365.164201]  [<ffffffff81083499>] __raw_notifier_call_chain+0x9/0x10
> [  365.164207]  [<ffffffff810567be>] cpu_notify+0x1e/0x40
> [  365.164217]  [<ffffffff81525da2>] take_cpu_down+0x22/0x40
> [  365.164223]  [<ffffffff810ed9c6>] multi_cpu_stop+0xd6/0x120
> [  365.164229]  [<ffffffff810edd97>] cpu_stopper_thread+0xd7/0x1e0
> [  365.164235]  [<ffffffff810863a3>] smpboot_thread_fn+0x203/0x380
> [  365.164241]  [<ffffffff8107cbf8>] kthread+0xc8/0xd0
> [  365.164250]  [<ffffffff8154440c>] ret_from_fork+0x7c/0xb0
> [  365.164429] smpboot: CPU 1 is now offline
>
> Signed-off-by: Mike Galbraith <bitbucket@...ine.de>

Dirty! Applied, thanks :)

-- 
Jens Axboe

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