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Date: Tue, 17 Jul 2007 21:32:23 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>
Cc: Gabriel C <nix.or.die@googlemail.com>,
       Carsten Emde <carsten.emde@osadl.org>,
       "jcaceres@ccrma.Stanford.EDU" <jcaceres@ccrma.Stanford.EDU>,
       Steven Rostedt <rostedt@goodmis.org>,
       RT-Users <linux-rt-users@vger.kernel.org>,
       LKML <linux-kernel@vger.kernel.org>,
       Thomas Gleixner <tglx@linutronix.de>, Rui Nuno Capela <rncbc@rncbc.org>
Subject: Re: v2.6.21.5-rt19 (sched_getaffinity?)
Message-ID: <20070717193223.GJ26283@elte.hu>
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* Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU> wrote:

> I do get flash 9 (I know, not the best example) and tomboy to hang as 
> reported by one of my Planet CCRMA users - flash 9 tested working on 
> stock fedora 7 kernel - and both seem to hang in the same system call:
> 
> sched_getaffinity(3528, 32, <unfinished ...>
> 
> Full output of strace attached for both cases.

hm, that's weird. Is it completely unkillable at that time? Could you do 
a few things: enable CONFIG_PROVE_LOCKING (lockdep), and also try to get 
a full task state dump via:

  echo t > /proc/sysrq-trigger

thanks,

	Ingo