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Re: [Xen-devel] xenstored crashes with SIGSEGV

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)



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