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

[H. Peter Anvin]

Vegard Nossum wrote:
> On Thu, Sep 25, 2008 at 10:49 PM, H. Peter Anvin <hpa@xxxxxxxxx> 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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