linux-kernel - Re: [next-20141231] sched: WARNING: CPU: 1 PID: 2539 at kernel/sched/core.c:7303 __might

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Date:	Mon, 9 Feb 2015 05:29:34 +0100
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-next <linux-next@...r.kernel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Jens Axboe <axboe@...com>,
	"open list:AIO" <linux-aio@...ck.org>,
	Benjamin LaHaise <bcrl@...ck.org>
Subject: Re: [next-20141231] sched: WARNING: CPU: 1 PID: 2539 at
 kernel/sched/core.c:7303 __might_sleep+0xbd/0xd0()

On Sun, Jan 4, 2015 at 8:53 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Sun, Jan 4, 2015 at 1:59 AM, Ming Lei <ming.lei@...onical.com> wrote:
>> Hi Sedat,
>>
>> On Sun, Jan 4, 2015 at 7:42 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>>> On Thu, Jan 1, 2015 at 11:28 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>>>> Hi,
>>>>
>>>> with next-20141231 I am seeing this call-trace:
>>>>
>>>> [   88.028632] ------------[ cut here ]------------
>>>> [   88.028643] WARNING: CPU: 1 PID: 2539 at kernel/sched/core.c:7303
>>>> __might_sleep+0xbd/0xd0()
>>>> [   88.028646] do not call blocking ops when !TASK_RUNNING; state=1
>>>> set at [<ffffffff810b82dd>] prepare_to_wait_event+0x5d/0x110
>>>> [   88.028648] Modules linked in: ppp_deflate bsd_comp ppp_async
>>>> crc_ccitt arc4 iwldvm uvcvideo mac80211 snd_hda_codec_hdmi
>>>> snd_hda_codec_realtek parport_pc videobuf2_vmalloc
>>>> snd_hda_codec_generic ppdev videobuf2_memops snd_hda_intel
>>>> videobuf2_core rfcomm bnep snd_hda_controller option snd_hda_codec
>>>> v4l2_common i915 joydev videodev usb_wwan snd_hwdep usbserial
>>>> cdc_ether snd_pcm usbnet btusb snd_seq_midi snd_seq_midi_event
>>>> bluetooth psmouse snd_rawmidi iwlwifi snd_seq i2c_algo_bit
>>>> drm_kms_helper snd_timer serio_raw snd_seq_device samsung_laptop drm
>>>> snd cfg80211 soundcore video lpc_ich intel_rst wmi mac_hid binfmt_misc
>>>> lp parport hid_generic usbhid hid r8169 mii usb_storage
>>>> [   88.028694] CPU: 1 PID: 2539 Comm: fio Not tainted
>>>> 3.19.0-rc2-next20141231-1-iniza-small #1
>>>> [   88.028695] Hardware name: SAMSUNG ELECTRONICS CO., LTD.
>>>> 530U3BI/530U4BI/530U4BH/530U3BI/530U4BI/530U4BH, BIOS 13XK 03/28/2013
>>>> [   88.028697]  ffffffff81a66d5f ffff880070f43c38 ffffffff8175c50c
>>>> 0000000000000000
>>>> [   88.028700]  ffff880070f43c88 ffff880070f43c78 ffffffff810753ba
>>>> ffff880070f43d28
>>>> [   88.028703]  ffffffff81a67ef5 000000000000026d 0000000000000000
>>>> 0000000000dce810
>>>> [   88.028706] Call Trace:
>>>> [   88.028712]  [<ffffffff8175c50c>] dump_stack+0x4c/0x65
>>>> [   88.028716]  [<ffffffff810753ba>] warn_slowpath_common+0x8a/0xc0
>>>> [   88.028719]  [<ffffffff81075436>] warn_slowpath_fmt+0x46/0x50
>>>> [   88.028722]  [<ffffffff810c2c3d>] ? mark_held_locks+0x6d/0xa0
>>>> [   88.028725]  [<ffffffff81761732>] ? mutex_lock_nested+0x2b2/0x4e0
>>>> [   88.028727]  [<ffffffff810b82dd>] ? prepare_to_wait_event+0x5d/0x110
>>>> [   88.028729]  [<ffffffff810b82dd>] ? prepare_to_wait_event+0x5d/0x110
>>>> [   88.028731]  [<ffffffff8109c3ad>] __might_sleep+0xbd/0xd0
>>>> [   88.028734]  [<ffffffff817614af>] mutex_lock_nested+0x2f/0x4e0
>>>> [   88.028736]  [<ffffffff810b82d3>] ? prepare_to_wait_event+0x53/0x110
>>>> [   88.028739]  [<ffffffff8124433f>] aio_read_events+0x4f/0x2d0
>>>> [   88.028742]  [<ffffffff810c2e7d>] ? trace_hardirqs_on+0xd/0x10
>>>> [   88.028745]  [<ffffffff812447c0>] read_events+0x200/0x320
>>>> [   88.028747]  [<ffffffff810b81c0>] ? wait_woken+0xc0/0xc0
>>>> [   88.028750]  [<ffffffff810e9690>] ? hrtimer_get_res+0x50/0x50
>>>> [   88.028753]  [<ffffffff81244ca0>] ? lookup_ioctx+0xd0/0x140
>>>> [   88.028755]  [<ffffffff812466b2>] SyS_io_getevents+0x62/0x100
>>>> [   88.028759]  [<ffffffff813b59be>] ? trace_hardirqs_on_thunk+0x3a/0x3f
>>>> [   88.028762]  [<ffffffff817663ed>] system_call_fastpath+0x16/0x1b
>>>> [   88.028764] ---[ end trace dba4f4a06fcdd178 ]---
>>
>> It is an known linux-aio issue, see the following link:
>>
>> http://marc.info/?t=141925049600004&r=1&w=2
>>
>
> This discussion resulted in a RFC patch of Chris Mason which is still
> discussed in [1].
>
> - Sedat -
>
> [1] http://marc.info/?t=141929396100001&r=1&w=2

The issue was fixed in Linux v3.19 (final) by...

commit 9c9ce763b114e608b5cf3aa6cb69ad9f6e8b6adf
"aio: annotate aio_read_event_ring for sleep patterns"

See also [2] for more details.

- Sedat -

[1] http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9c9ce763b114e608b5cf3aa6cb69ad9f6e8b6adf
[2] http://marc.info/?l=linux-fsdevel&m=142345568702640&w=2
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