linux-kernel - Possible FPU context corruption w/ CONFIG

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

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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