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

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Message-ID: <19f34abd0809251402v13b926a1o2236ddb9e7517a65@mail.gmail.com>
Date:	Thu, 25 Sep 2008 23:02:54 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"H. Peter Anvin" <hpa@...or.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?

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 :-)


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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