linux-kernel - Re: futexes: Still infinite loop in get_futex

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Message-ID: <4A7023BC.6000109@cosmosbay.com>
Date:	Wed, 29 Jul 2009 12:26:04 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Jens Rosenboom <jens@...one.net>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Sonny Rao <sonnyrao@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: futexes: Still infinite loop in get_futex_key() in 2.6.31-rc4

Jens Rosenboom a écrit :
> On Wed, 2009-07-29 at 08:22 +0200, Jens Rosenboom wrote:
>> On Mon, 2009-07-27 at 15:36 +0200, Peter Zijlstra wrote:
>> [...]
>>> Bugger.. how easy it is to reproduce?
>> Okay, my colleague found the right combination of scripts, take the two
>> attached, run them both a couple of times in parallel for some hours,
>> and get a stuck ps. This happens both on an old 2.6.29.1 I happened to
>> still have on one machine as with 2.6.31-rc4. Both of them dual-core
>> Opterons as the original one. If you want further tracebacks or other
>> information, let me know.
> 
> Forget about null.pl even, just run pees.pl twice and a top to watch it,
> has worked for me within less than an hour several times now.
> 

Ah that makes sense now...

maybe execve() forgets to clear clear_child_tid 


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