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Re: RE: RE: [Xen-devel] wget and Zope crashes on post-2.0.6 -testing

To: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>
Subject: Re: RE: RE: [Xen-devel] wget and Zope crashes on post-2.0.6 -testing
From: Kurt Garloff <garloff@xxxxxxx>
Date: Wed, 8 Jun 2005 23:42:44 +0200
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Kip Macy <kip.macy@xxxxxxxxx>, Rich Persaud <rich@xxxxxxxxxxxxx>, Osma Suominen <osma.suominen@xxxxxxxxxxxx>, Gerd Knorr <kraxel@xxxxxxx>
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Hi Ian,

On Wed, Jun 08, 2005 at 10:19:35PM +0100, Ian Pratt wrote:
> > I observed that the first userspace process that uses the FPU 
> > will SIGFPE once. Afterwards everything runs just fine ...
> > 
> > You description looks like it matches exactly the 
> > misbehaviour I've been seeing.
> Got any more critical bugs you're not telling us about? :-)

I wanted to hunt that one down myself ... obviously overestimating
the amount of time and expertise I can devote to it :(

OK, you want another one:
Well, xenified SLES9 oopses on balloooning :-)
But I hope that Christian, Kip, /me will track this one
down soon.

> > Is attached patch the right way to fix this?
> I think that should work (with the obvious kernel_ prefix), but I've
> appeneded what we've gone for.

Not having a CPU manual close to my desk: What do we achieve by setting
bit 3 (TS) in CR0? Why does it help to get the FPU back to a sane state?

Kurt Garloff, Director SUSE Labs, Novell Inc.

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