From: Luigi Semenzato <semenzato@google.com>
To: David Rientjes <rientjes@google.com>
Cc: Minchan Kim <minchan@kernel.org>,
linux-mm@kvack.org, Dan Magenheimer <dan.magenheimer@oracle.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Subject: Re: zram OOM behavior
Date: Mon, 29 Oct 2012 15:36:38 -0700 [thread overview]
Message-ID: <CAA25o9Rk_C=jaHJwWQ8TJL0NF5_Xv2umwxirtdugF6w3rHruXg@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1210291158510.10845@chino.kir.corp.google.com>
On Mon, Oct 29, 2012 at 12:00 PM, David Rientjes <rientjes@google.com> wrote:
> On Mon, 29 Oct 2012, Luigi Semenzato wrote:
>
>> I managed to get the stack trace for the process that refuses to die.
>> I am not sure it's due to the deadlock described in earlier messages.
>> I will investigate further.
>>
>> [96283.704390] chrome x 815ecd20 0 16573 1112 0x00100104
>> [96283.704405] c107fe34 00200046 f57ae000 815ecd20 815ecd20 ec0b645a
>> 0000578f f67cfd20
>> [96283.704427] d0a9a9a0 c107fdf8 81037be5 f5bdf1e8 f6021800 00000000
>> c107fe04 00200202
>> [96283.704449] c107fe0c 00200202 f5bdf1b0 c107fe24 8117ddb1 00200202
>> f5bdf1b0 f5bdf1b8
>> [96283.704471] Call Trace:
>> [96283.704484] [<81037be5>] ? queue_work_on+0x2d/0x39
>> [96283.704497] [<8117ddb1>] ? put_io_context+0x52/0x6a
>> [96283.704510] [<813b68f6>] schedule+0x56/0x58
>> [96283.704520] [<81028525>] do_exit+0x63e/0x640
>
> Could you find out where this happens to be in the function? If you
> enable CONFIG_DEBUG_INFO, you should be able to use gdb on vmlinux and
> find out with l *do_exit+0x63e.
It looks like it's the final call to schedule() in do_exit():
0x81028520 <+1593>: call 0x813b68a0 <schedule>
0x81028525 <+1598>: ud2a
(gdb) l *do_exit+0x63e
0x81028525 is in do_exit
(/home/semenzato/trunk/src/third_party/kernel/files/kernel/exit.c:1069).
1064
1065 /* causes final put_task_struct in finish_task_switch(). */
1066 tsk->state = TASK_DEAD;
1067 tsk->flags |= PF_NOFREEZE; /* tell freezer to ignore us */
1068 schedule();
1069 BUG();
1070 /* Avoid "noreturn function does return". */
1071 for (;;)
1072 cpu_relax(); /* For when BUG is null */
1073 }
Here's a theory: the thread exits fine, but the next scheduled thread
tries to allocate memory before or during finish_task_switch(), so the
dead thread is never cleaned up completely and is still considered
alive by the OOM killer.
Unfortunately I haven't found a code path that supports this theory...
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next prev parent reply other threads:[~2012-10-29 22:36 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-28 17:32 Luigi Semenzato
2012-10-03 13:30 ` Konrad Rzeszutek Wilk
[not found] ` <CAA25o9SwO209DD6CUx-LzhMt9XU6niGJ-fBPmgwfcrUvf0BPWA@mail.gmail.com>
2012-10-12 23:30 ` Luigi Semenzato
2012-10-15 14:44 ` Minchan Kim
2012-10-15 18:54 ` Luigi Semenzato
2012-10-16 6:18 ` Minchan Kim
2012-10-16 17:36 ` Luigi Semenzato
2012-10-19 17:49 ` Luigi Semenzato
2012-10-22 23:53 ` Minchan Kim
2012-10-23 0:40 ` Luigi Semenzato
2012-10-23 6:03 ` David Rientjes
2012-10-29 18:26 ` Luigi Semenzato
2012-10-29 19:00 ` David Rientjes
2012-10-29 22:36 ` Luigi Semenzato [this message]
2012-10-29 22:52 ` David Rientjes
2012-10-29 23:23 ` Luigi Semenzato
2012-10-29 23:34 ` Luigi Semenzato
2012-10-30 0:18 ` Minchan Kim
2012-10-30 0:45 ` Luigi Semenzato
2012-10-30 5:41 ` David Rientjes
2012-10-30 19:12 ` Luigi Semenzato
2012-10-30 20:30 ` Luigi Semenzato
2012-10-30 22:32 ` Luigi Semenzato
2012-10-31 18:42 ` David Rientjes
2012-10-30 22:37 ` Sonny Rao
2012-10-31 4:46 ` David Rientjes
2012-10-31 6:14 ` Luigi Semenzato
2012-10-31 6:28 ` Luigi Semenzato
2012-10-31 18:45 ` David Rientjes
2012-10-31 0:57 ` Minchan Kim
2012-10-31 1:06 ` Luigi Semenzato
2012-10-31 1:27 ` Minchan Kim
2012-10-31 3:49 ` Luigi Semenzato
2012-10-31 7:24 ` Minchan Kim
2012-10-31 16:07 ` Luigi Semenzato
2012-10-31 17:49 ` Mandeep Singh Baines
2012-10-31 18:54 ` David Rientjes
2012-10-31 21:40 ` Luigi Semenzato
2012-11-01 2:11 ` Minchan Kim
2012-11-01 4:38 ` David Rientjes
2012-11-01 5:18 ` Minchan Kim
2012-11-01 2:43 ` Minchan Kim
2012-11-01 4:48 ` David Rientjes
2012-11-01 5:26 ` Minchan Kim
2012-11-01 8:28 ` Mel Gorman
2012-11-01 15:57 ` Luigi Semenzato
2012-11-01 15:58 ` Luigi Semenzato
2012-11-01 21:48 ` David Rientjes
2012-11-01 17:50 ` Luigi Semenzato
2012-11-01 21:50 ` David Rientjes
2012-11-01 21:58 ` [patch] mm, oom: allow exiting threads to have access to memory reserves David Rientjes
2012-11-01 22:43 ` Andrew Morton
2012-11-01 23:05 ` David Rientjes
2012-11-01 23:06 ` Luigi Semenzato
2012-11-01 22:04 ` zram OOM behavior Luigi Semenzato
2012-11-01 22:25 ` David Rientjes
2012-11-02 6:39 Minchan Kim
2012-11-02 8:30 ` Mel Gorman
2012-11-02 22:36 ` Minchan Kim
2012-11-05 14:46 ` Mel Gorman
2012-11-06 0:25 ` Minchan Kim
2012-11-06 8:58 ` Mel Gorman
2012-11-06 10:17 ` Minchan Kim
2012-11-09 9:50 ` Mel Gorman
2012-11-12 13:32 ` Minchan Kim
2012-11-12 14:06 ` Mel Gorman
2012-11-13 13:31 ` Minchan Kim
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