linux-kernel - Re: [PATCH] mm : Avoid candidate task is equal to current task

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Date:	Fri, 18 Apr 2014 18:23:59 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Chiang <pchiang@...dia.com>
Cc:	"ccross@...roid.com" <ccross@...roid.com>,
	"lizefan@...wei.com" <lizefan@...wei.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"tj@...nel.org" <tj@...nel.org>, "pavel@....cz" <pavel@....cz>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>,
	"guillaume@...infr.org" <guillaume@...infr.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm : Avoid candidate task is equal to current task

On 04/17, Peter Chiang wrote:
>
> It is a speculation where the panic was.
>
> [38261.652100] Call trace:
> [38261.654616] [<ffffffc000aa6fe0>] mm_update_next_owner+0x190/0x238
> [38261.660766] [<ffffffc000aa728c>] do_exit+0x204/0x924
> [38261.665790] [<ffffffc000aa7a1c>] do_group_exit+0x40/0xcc
> [38261.671169] [<ffffffc000ab59cc>] get_signal_to_deliver+0x218/0x57c
> [38261.677409] [<ffffffc000a87e6c>] do_signal+0x534/0x550
> [38261.682608] [<ffffffc000a88070>] do_notify_resume+0x20/0x58

Could you show the full dmesg?

Could you look into asm/objdump/addr2line to figure out what this
mm_update_next_owner+0x190 means?

Is it reproducable?

Hmm. I seem to see a bug in this function, it can be fulled by use_mm,
but I am not sure this can explain the problem. I'll send a patch.

Oleg.

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