Re: [rfcomm_run] WARNING: CPU: 0 PID: 95 at kernel/sched/core.c:7312 __might_sleep()

From: Peter Zijlstra
Date: Fri Oct 31 2014 - 08:10:22 EST


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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