Re: [Xen-devel] xenstored crashes with SIGSEGV

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Dec 18, 2014 at 10:25:15AM +0000, David Vrabel wrote:
> 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

More up-to-date: http://lkml.iu.edu/hypermail/linux/kernel/1409.0/01057.html

And boy did that mess up Oracle DB! There had been an P0 bug affecting
databases and this patch solved it.

> 
> David

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