linux-kernel - Re: Processes hang in an unkillable state

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Message-ID: <BANLkTimfRrFTkZqqekgs3e6OgqSc2AH9NQ@mail.gmail.com>
Date:	Wed, 13 Apr 2011 00:30:51 +0200
From:	Robert Święcki <robert@...ecki.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
	Miklos Szeredi <mszeredi@...e.cz>
Subject: Re: Processes hang in an unkillable state

On Wed, Apr 13, 2011 at 12:18 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Tue, Apr 12, 2011 at 3:16 PM, Robert Święcki <robert@...ecki.net> wrote:
>> On Wed, Apr 13, 2011 at 12:12 AM, Linus Torvalds
>> <torvalds@...ux-foundation.org> wrote:
>>> On Tue, Apr 12, 2011 at 2:59 PM, Robert Święcki <robert@...ecki.net> wrote:
>>>>
>>>> Compiling now with CONFIG_OPTIMIZE_SIZE and vma dump code. Will
>>>> probably post some results tomorrow.
>>>
>>> .. and if you've added my patch to the stack growth case, hopefully
>>> there won't _be_ any results ;)
>>
>> I can, depending in whether you'd like to see vma dump results for
>> this case or not. Let me know, it's still cooooompiling :).
>
> Please do add it. Since it can take a long time to trigger, it's best
> to just try to fix this issue asap. If it never triggers, and we don't
> see any vma dumps, I won't cry.

Ok,

btw, here might be another path which hits this (at least I think so).

http://alt.swiecki.net/linux_kernel/sys_mprotect-2.6.38.txt

And, generally: here are a few deadlocks/bug_on's/ooops gathered
earlier (some fixed already) - http://alt.swiecki.net/linux_kernel/ -
I'll try to ask for fixes for them one by one, as soon as they repeat
and I have proper kdb/perf dumps.

-- 
Robert Święcki
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