linux-kernel - Re: [rfcomm_run] WARNING: CPU: 0 PID: 95 at kernel/sched/core.c:7312 __might

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Message-ID: <20141031121008.GK10501@worktop.programming.kicks-ass.net>
Date:	Fri, 31 Oct 2014 13:10:08 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	LKP <lkp@...org>, linux-kernel@...r.kernel.org,
	Fenghua Yu <fenghua.yu@...el.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Subject: Re: [rfcomm_run] WARNING: CPU: 0 PID: 95 at kernel/sched/core.c:7312
 __might_sleep()

On Mon, Oct 27, 2014 at 10:03:25PM +0800, Fengguang Wu wrote:
> On Mon, Oct 27, 2014 at 02:36:27PM +0100, Peter Zijlstra wrote:
> > On Mon, Oct 27, 2014 at 09:06:21PM +0800, Fengguang Wu wrote:
> > > Hi Peter,
> > > 
> > > FYI, this bug seems still there on v3.18-rc2.
> > 
> > Oh, right, I commented out that patch and the audit one because I was
> > waiting for some feedback. Lemme go prod people.
> 
> One more warning, looks like triggered by thermal_apic_exit. Authors CCed.
> 
> [   29.107798] Running tests on trace events:
> [   29.108302] Testing event thermal_apic_exit: 
> [   29.143786] ------------[ cut here ]------------
> [   29.144489] WARNING: CPU: 1 PID: 101 at kernel/sched/core.c:7187 __might_sleep+0xb9/0x100()
> [   29.145781] do not call blocking ops when !TASK_RUNNING; state=1 set at [<c1e62e65>] event_test_thread+0x58/0x92
> [   29.147139] Modules linked in:
> [   29.147604] CPU: 1 PID: 101 Comm: test-events Not tainted 3.17.0-rc6-01872-ga0d2c46 #17
> [   29.148646] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
> [   29.149969]  00000001 00000000 ffffffff cbc4fe5c c17ef50f cbc4fea4 00000001 00000065
> [   29.151143]  cbc4fe78 c10689d7 00001c13 c10a5f59 00000001 00000000 00000029 cbc4fe90
> [   29.152343]  c1068a1b 00000009 cbc4fe88 c1b5cc24 cbc4fea4 cbc4fec4 c10a5f59 c1b5c9b0
> [   29.153511] Call Trace:
> [   29.153859]  [<c17ef50f>] dump_stack+0x78/0xa8
> [   29.154448]  [<c10689d7>] warn_slowpath_common+0x87/0xa0
> [   29.155119]  [<c10a5f59>] ? __might_sleep+0xb9/0x100
> [   29.155706]  [<c1068a1b>] warn_slowpath_fmt+0x2b/0x30
> [   29.164357]  [<c10a5f59>] __might_sleep+0xb9/0x100
> [   29.164935]  [<c1e62e65>] ? event_test_thread+0x58/0x92
> [   29.165541]  [<c1e62e65>] ? event_test_thread+0x58/0x92
> [   29.166154]  [<c17f8d4c>] down_read+0x1c/0x50
> [   29.166660]  [<c1083a6f>] exit_signals+0x1f/0x1d0
> [   29.167215]  [<c106bc1f>] do_exit+0x1bf/0x13a0
> [   29.167748]  [<c1e62e0d>] ? event_test_stuff+0x6c/0x6c
> [   29.168434]  [<c109bea8>] ? kthread_should_stop+0x8/0x20
> [   29.169145]  [<c1e62e0d>] ? event_test_stuff+0x6c/0x6c
> [   29.169829]  [<c109c3d4>] kthread+0xe4/0x110
> [   29.170397]  [<c1e62e0d>] ? event_test_stuff+0x6c/0x6c
> [   29.171082]  [<c10d0000>] ? push_dl_task+0x50/0x5a0
> [   29.171759]  [<c17fbf21>] ret_from_kernel_thread+0x21/0x30
> [   29.172496]  [<c109c2f0>] ? insert_kthread_work+0x110/0x110
> [   29.173234] ---[ end trace 12bb28a4b269a09b ]---
> [   29.173913] test-events (101) used greatest stack depth: 6712 bytes left

Hmm, confusing that, did that tree include:
  fe0e01c77dd9 ("tracing: Robustify wait loop")

?
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