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

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Message-ID: <4A6DAEA4.9090107@gmail.com>
Date:	Mon, 27 Jul 2009 15:41:56 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Jens Rosenboom <jens@...one.net>, 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

Peter Zijlstra a écrit :
> On Mon, 2009-07-27 at 14:45 +0200, Jens Rosenboom wrote:
> 
>> Good question, but as this happens on a production machine, I cannot
>> easily change the installation to check this.
> 
> Uhm, but you do run .31-rc4 on it? :-)
> 
>> Attaching an strace to the process gives just
>>
>> # strace -p 12886
>> Process 12886 attached - interrupt to quit
>>
>> and nothing further.
> 
> Bugger.. how easy it is to reproduce?
> --

Strange thing is that "ps ax" doesnt use threads at all.

Stack trace seems to show mm_release() calls futex code,
but this part should not be called when a mono threaded program
exits (its clear_child_tid should be NULL at this point)


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