From: "H. Peter Anvin" <hpa@zytor.com>
To: Vegard Nossum <vegard.nossum@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>,
x86@kernel.org, linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: v2.6.27-rc7: x86: #GP on panic?
Date: Thu, 25 Sep 2008 13:49:40 -0700 [thread overview]
Message-ID: <48DBF964.7070106@zytor.com> (raw)
In-Reply-To: <19f34abd0809251346r62cff1ck4730260f17e643b3@mail.gmail.com>
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
next prev parent reply other threads:[~2008-09-25 20:50 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-24 19:09 v2.6.27-rc7: x86: #GP on panic? Vegard Nossum
2008-09-25 8:04 ` Ingo Molnar
2008-09-25 8:53 ` H. Peter Anvin
2008-09-25 14:07 ` Vegard Nossum
2008-09-25 15:20 ` Vegard Nossum
2008-09-25 20:46 ` Vegard Nossum
2008-09-25 20:49 ` H. Peter Anvin [this message]
2008-09-25 21:02 ` Vegard Nossum
2008-09-25 21:53 ` H. Peter Anvin
2008-09-27 18:43 ` Ingo Molnar
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