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

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Date:	Sat, 11 Feb 2012 18:30:42 +0000
From:	Bart Van Assche <bvanassche@....org>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Tejun Heo <htejun@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: exit_aio() hang after I/O failure

On Mon, Jan 23, 2012 at 4:47 PM, Bart Van Assche <bvanassche@....org> wrote:
> On Mon, Jan 23, 2012 at 4:15 PM, Jeff Moyer <jmoyer@...hat.com> wrote:
> > Bart Van Assche <bvanassche@....org> writes:
> > > 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()).
> >
> > Fixed here:
> >
> > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=69e4747ee9727d660b88d7e1efe0f4afcb35db1b
>
> Thanks a lot for the feedback - I'll give this patch a try.

Bad news: I've been able to reproduce exactly the same call stack with
kernel 3.2.5. That kernel version includes the aforementioned commit.

# echo t >/proc/sysrq-trigger
[ ... ]
fio             D 0000000000000001     0 25052  25008 0x00000004
 ffff88001c32fb88 0000000000000046 ffff880000000000 ffff88007d949bc8
 ffff88001c8e14d0 ffff88001c32ffd8 ffff88001c32ffd8 ffff88001c32ffd8
 ffff880128b894d0 ffff88001c8e14d0 ffff88001c32fb88 000000018106f24d
Call Trace:
 [<ffffffff813b683f>] schedule+0x3f/0x60
 [<ffffffff813b68ef>] io_schedule+0x8f/0xd0
 [<ffffffff81174410>] wait_for_all_aios+0xc0/0x100
 [<ffffffff8103c3c0>] ? try_to_wake_up+0x270/0x270
 [<ffffffff81175385>] exit_aio+0x55/0xc0
 [<ffffffff810413cd>] mmput+0x2d/0x110
 [<ffffffff81047c1d>] exit_mm+0x10d/0x130
 [<ffffffff810482b1>] do_exit+0x671/0x860
 [<ffffffff81033c1e>] ? finish_task_switch+0x4e/0xe0
 [<ffffffff81048804>] do_group_exit+0x44/0xb0
 [<ffffffff81058018>] get_signal_to_deliver+0x218/0x5a0
 [<ffffffff81002065>] do_signal+0x65/0x700
 [<ffffffff811740d0>] ? aio_read_evt+0x150/0x150
 [<ffffffff8103c3c0>] ? try_to_wake_up+0x270/0x270
 [<ffffffff81002785>] do_notify_resume+0x65/0x80
 [<ffffffff811df84e>] ? trace_hardirqs_on_thunk+0x3a/0x3c
 [<ffffffff813c0333>] int_signal+0x12/0x17
[ ... ]

Bart.
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