linux-kernel - Re: CONFIG_PREEMPT causes corruption of application's FPU stack

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Date:	Sat, 24 May 2008 20:52:30 +0200
From:	j.mell@...nline.de
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: CONFIG_PREEMPT causes corruption of application's FPU stack

On Sonday, 18. May 2008, you wrote:
> > On Sat, May 17, 2008 at 06:31:08PM +0200, J?rgen Mell wrote:
> > > I tracked this down to a single kernel configuration option. If
> > > CONFIG_PREEMPT is set to 'y' the application will start crashing. If
> > > CONFIG_PREEMPT is replaced by CONFIG_PREEMPT_VOLUNTARY, the
> > > application will run without errors.

> > If you see it in the kernel.org kernel, can you please do a git-bisect
> > to see which commit caused the problem?

> This is a bit of a problem. I do not know whether there was *ever* a
> kernel  version with CONFIG_PREEMPT and without this problem as I have
> not tried  any older kernel version yet. I will go back to SUSE 10.2 and
> try the  2.6.18 kernel that comes with it.

I found now that the problem was introduced somewhere between the 
kernel.org kernels 2.6.19.7 and 2.6.20. I will start bisecting now.

Bye,

          Jürgen
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