linux-kernel - Re: v2.6.27-rc7: x86: #GP on panic?

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Message-ID: <48DC0859.8010103@zytor.com>
Date:	Thu, 25 Sep 2008 14:53:29 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Vegard Nossum <vegard.nossum@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: v2.6.27-rc7: x86: #GP on panic?

Vegard Nossum wrote:
> On Thu, Sep 25, 2008 at 10:49 PM, H. Peter Anvin <hpa@...or.com> wrote:
>>> Seems like an external interrupt happened and was delivered after the sti?
>>>
>>> Hm. I guess it smells like a qemu bug since it's rather easily
>>> reproducible here and sounds strange that nobody else saw it. Is qemu
>>> 0.9.1.
>>>
>> Yes, but there shouldn't be any external interrupts that could turn into  a
>> divide error.  It really smells like a Qemu problem -- possibly even a Qemu
>> miscompile -- to me.
>>
>> Does it reproduce in KVM?
> 
> I have no computer that can do KVM, sorry :-(
> 
> Stack trace contains IO_APIC functions, so it seems that maybe the
> emulated IOAPIC is trying to (erroneously) deliver an int 0 (for some
> reason)? But I don't know, that's just speculation which can be done
> better by others, so I will stop now :-)
> 

I suspect it's a problem in Qemu's IOAPIC model, but it's hard to know 
for sure.

	-hpa
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