On Wed, Feb 17, 2016 at 11:31:41AM +0100, Borislav Petkov wrote:
> On Wed, Feb 17, 2016 at 10:35:12AM +0100, Ingo Molnar wrote:
> > So it probably triggers on vanilla v4.4 (or v4.5-rc4) as well, with no
> > recent FPU bits applied?
> 
> Nope, 4.4 doesn't trigger. Lemme try some of those other commits...

Results:

  tip/x86/fpu:

  58122bf1d856 x86/fpu: Default eagerfpu=on on all CPUs         - BAD
  c6ab109f7e0e x86/fpu: Speed up lazy FPU restores slightly     - BAD
  a20d7297045f x86/fpu: Fold fpu_copy() into fpu__copy()        - BAD
  5ed73f40735c x86/fpu: Fix FNSAVE usage in eagerfpu mode       - BAD
  4ecd16ec7059 x86/fpu: Fix math emulation in eager fpu mode    - BAD
  765bdb406de4 ("Merge tag 'for-linus' of 
git://git.kernel.org/pub/scm/virt/kvm/kvm")   - BAD

  ...

  v4.4: GOOD

so it must be something else causing it AFAICT.

I'll continue trying the -rc's and the tip/master merges to see what
causes it. Let me know if you have a better idea.

-- 
Regards/Gruss,
    Boris.

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