linux-kernel - Re: v2.6.21.5-rt19 (sched

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


* Fernando Lopez-Lezcano <nando@...ma.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
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