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SubjectRe: v2.6.27-rc7: x86: #GP on panic?
Vegard Nossum wrote:
>
> But I don't see how the divide error could occur here:
>
> ffffffff8103918b: fb sti
> ffffffff8103918c: 49 c7 c4 80 c0 6e 81 mov $0xffffffff816ec080,%r12
> ffffffff81039193: f6 c3 01 test $0x1,%bl
> ffffffff81039196: 74 27 je ffffffff810391bf <__do_so
> ffffffff81039198: 4c 89 e7 mov %r12,%rdi
> ffffffff8103919b: 41 ff 14 24 callq *(%r12)
>
> 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?

-hpa


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