linux-kernel - Re: WARNING: CPU: 0 PID: 3031 at ./arch/x86/include/asm/fpu/internal.h:530 fpu_

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Date:	Wed, 17 Feb 2016 12:41:27 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Andy Lutomirski <luto@...capital.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>
Subject: Re: WARNING: CPU: 0 PID: 3031 at
 ./arch/x86/include/asm/fpu/internal.h:530 fpu__restore+0x90/0x130()

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.

ECO tip #101: Trim your mails when you reply.