Date: Mon, 27 Jul 2009 16:00:39 +0200
From: Jens Rosenboom <jens.rosenboom@freenet.ag>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Sonny Rao <sonnyrao@us.ibm.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: futexes: Still infinite loop in get_futex_key() in 2.6.31-rc4
Message-ID: <20090727140039.GC13577@bo.mcbone.net>
References: <1248681637.7279.12.camel@fnki-nb00130> <1248694266.6987.1594.camel@twins> <1248697004.7279.31.camel@fnki-nb00130> <1248697409.6987.1617.camel@twins> <1248698755.7279.47.camel@fnki-nb00130> <1248701812.6987.1637.camel@twins>
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On Mon, Jul 27, 2009 at 03:36:52PM +0200, Peter Zijlstra wrote:
> 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? :-)

In the hope of verifying a patch, yes. Before that we had 2.6.29.4
for some time.

> > 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?

There is a lot of stuff happening on this machine, I'm not sure
what part of it is necessary to trigger the bug. Currently it
takes anything from a couple of hours to a couple of days for
the first stuck ps to appear.
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