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

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Message-ID: <BANLkTinjGkbBMUo7MQ2Dg2yDwQ932qJ7rQ@mail.gmail.com>
Date:	Tue, 12 Apr 2011 23:59:37 +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

>> Ok, just to update you with what I'm currently doing:
>>
>> I'm testing now with 2.6.39-rc3 - according to
>> http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.39-rc3
>> it has vma_to_resize patch included
>> (982134ba62618c2d69fbbbd166d0a11ee3b7e3d8) - I applied the latest
>> Linus' patch for sys_mlock (the one patching memory.c and mlock.c),
>> disabled the sys_madvise in the fuzzer, and now I got the following
>> (full kdb dump attached)
>
> Ok, that's different from the apparent livelock.
>
> Except it once again is one of the BUG_ON's in vma_prio_tree_add() -
> and again, your kgdb thing has corrupted the bug information.
>
> Can you make a bug-report to the kgdb people?

Ok,

> You've lost Hugh's patch that did the vma dump instead of having the
> BUG_ON(). Can you try that one? And once more, I think that if you had
> CONFIG_OPTIMIZE_SIZE on, then I think gcc wouldn't re-order the basic
> blocks, and the BUG_ON() info would be easier to track.

Compiling now with CONFIG_OPTIMIZE_SIZE and vma dump code. Will
probably post some results tomorrow.

-- 
Robert Święcki
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