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

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Message-ID: <20090727140039.GC13577@bo.mcbone.net>
Date:	Mon, 27 Jul 2009 16:00:39 +0200
From:	Jens Rosenboom <jens.rosenboom@...enet.ag>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	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

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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