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Date: Fri, 26 Nov 2010 16:31:06 +0100
From: Tejun Heo <tj@kernel.org>
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To: lkml <linux-kernel@vger.kernel.org>,
        Suresh Siddha <suresh.b.siddha@intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Robert Richter <robert.richter@amd.com>,
        Dan Carpenter <error27@gmail.com>, Avi Kivity <avi@redhat.com>,
        Bernd Machenschalk <Bernd.Machenschalk@aei.mpg.de>,
        Heinz-Bernd Eggenstein <hbeggenst@aol.com>,
        Oliver Bock <oliver.bock@aei.mpg.de>,
        the arch/x86 maintainers <x86@kernel.org>
Subject: Possible FPU context corruption w/ CONFIG_PREEMPT
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Hello, guys.

Heinz-Bernd Eggenstein reports a possible FPU context corruption w/
CONFIG_PREEMPT.  Please take a look at the following forum post.

 http://einstein.phys.uwm.edu/forum_thread.php?id=8516

openSUSE 11.3 desktop kernel which has CONFIG_PREEMPT set is
triggering SIGFPE while the default kernel w/o preemption works fine.
He also notes that a similar bug was fixed in 2008 by commit 06c38d5e
(x86-64: fix FPU corruption with signals and preemption) from Suresh.
Does it ring anyone's bell?

Heinz, is there a simple procedure to reproduce the problem, or would
it be possible to lure you into bisection?

Thanks.

-- 
tejun
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