From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Vrabel <david.vrabel@citrix.com>
Subject: Re: xenstored crashes with SIGSEGV
Date: Thu, 18 Dec 2014 10:25:15 +0000
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To: Ian Campbell <Ian.Campbell@citrix.com>, Frediano Ziglio <freddy77@gmail.com>
Cc: George Dunlap <george.dunlap@eu.citrix.com>, Philipp Hahn <hahn@univention.de>, Ian Jackson <Ian.Jackson@eu.citrix.com>, Xen-devel@lists.xen.org, Jan Beulich <JBeulich@suse.com>
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On 18/12/14 10:17, Ian Campbell wrote:
> On Tue, 2014-12-16 at 16:13 +0000, Frediano Ziglio wrote:
>> Do we have a bug in Xen that affect SSE instructions (possibly already
>> fixed after Philipp version) ?
> 
> I've had a niggling feeling of Deja Vu over this which I'd been putting
> down to an old Xen on ARM bug in the area of FPU register switching.
> 
> But it seems at some point (possibly even still) there was a similar
> issue with pvops kernels on x86, see:
>         http://bugs.xenproject.org/xen/bug/40
> 
> Philipp, what kernel are you guys using?
> 
> CCing Jan and the x86 kernel guys (and George since he registered the
> bug). I'm not seeing anything in the kernel logs which looks like a fix
> (there's some PVH related cr0 frobbing, but I don't think that's it).
> 
> I also can't quite shake the feeling that there was another much older
> issue relating to FPU context switch on x86, but I think that was truly
> ancient history (2.6.18 era stuff)

http://marc.info/?l=linux-kernel&m=139132566024357

David