linux-kernel - Re: sysrq+t doesn't work for some threads

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Date:	Mon, 4 Aug 2008 21:51:24 +0200
From:	Bernd Schubert <bs@...eap.de>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: sysrq+t doesn't work for some threads

On Monday 04 August 2008 21:46:30 Robert Hancock wrote:
> Bernd Schubert wrote:
> > Hello,
> >
> > I need to debug a lustre problem, where lustre threads take 100% cpu time
> > and also have a memory leak. The problem is, that sysrq+t doesn't work
> > for these threads. It nicely shows all stack traces, just the trouble
> > some threads won't show their traces:
> >
> > [69338.858825] ll_mdt_36     R  running task       0 21679      2 (L-TLB)
>
> This means this task is running, you won't get a stack trace for such a
> thread. You'd likely have to stop it somehow. Is this a kernel thread?

Yes, it is a kernel thread. How can I stop it? Is there a way to stop kernel 
threads at all? kill -STOP doesn't work.


Thanks,
Bernd



-- 
Bernd Schubert
Q-Leap Networks GmbH
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