linux-kernel - exit_aio() hang after I/O failure

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Date:	Sun, 22 Jan 2012 12:48:37 +0000
From:	Bart Van Assche <bvanassche@....org>
To:	Jens Axboe <axboe@...nel.dk>, Tejun Heo <htejun@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: exit_aio() hang after I/O failure

Hi,

Apparently processes can hang in exit_aio() with at least kernel 3.2.1
after an I/O failure. Has anyone seen this before ?

This occurred after a SCSI device had been removed entirely (and hence
after all I/O requests were killed by scsi_remove_host()).

>From sysrq-t:

fio             D ffff88006546ab40     0  8966   8965 0x00000004
 ffff88011dab1b88 0000000000000046 ffff880100000000 ffff88012fa11d80
 ffff88006546a880 ffff88011dab1fd8 ffff88011dab1fd8 ffff88011dab1fd8
 ffff880128b89440 ffff88006546a880 ffff88011dab1ce8 0000000181039871
Call Trace:
 [<ffffffff813b360f>] schedule+0x3f/0x60
 [<ffffffff813b368f>] io_schedule+0x5f/0x80
 [<ffffffff811719e0>] wait_for_all_aios+0xc0/0x100
 [<ffffffff8103c210>] ? try_to_wake_up+0x270/0x270
 [<ffffffff81172955>] exit_aio+0x55/0xc0
 [<ffffffff8104119d>] mmput+0x2d/0x110
 [<ffffffff810478cd>] exit_mm+0x10d/0x130
 [<ffffffff81047f4c>] do_exit+0x65c/0x850
 [<ffffffff810484a4>] do_group_exit+0x44/0xb0
 [<ffffffff81057cb8>] get_signal_to_deliver+0x218/0x5a0
 [<ffffffff81002065>] do_signal+0x65/0x700
 [<ffffffff8106925a>] ? hrtimer_try_to_cancel+0x4a/0xb0
 [<ffffffff810692e2>] ? hrtimer_cancel+0x22/0x30
 [<ffffffff813b43c4>] ? do_nanosleep+0xa4/0xd0
 [<ffffffff813b4326>] ? do_nanosleep+0x6/0xd0
 [<ffffffff81069ea0>] ? hrtimer_nanosleep+0xa0/0x150
 [<ffffffff81002775>] do_notify_resume+0x55/0x70
 [<ffffffff811dcd6e>] ? trace_hardirqs_on_thunk+0x3a/0x3c
 [<ffffffff813bcff3>] int_signal+0x12/0x17

Bart.
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