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Date: Tue, 09 Jul 2013 08:26:22 -0400
From: Cole Robinson <crobinso@redhat.com>
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Subject: Re: [Qemu-devel] sending SEGV to qemu crashes host kernel in Fedora
 19
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To: Dave Airlie <airlied@gmail.com>
Cc: qemu-devel@nongnu.org, LKML <linux-kernel@vger.kernel.org>

On 07/08/2013 09:11 PM, Dave Airlie wrote:
> On Tue, Jul 9, 2013 at 10:35 AM, Dave Airlie <airlied@gmail.com> wrote:
>> Hi,
>>
>> F19
>> kernel-3.9.8-300.fc19.x86_64
>> qemu-kvm-1.4.2-4.fc19.x86_64
>>
>> If I start a complete F19 install in the guest and send the qemu
>> process a SEGV signal, the host kernel starts giving me random kmalloc
>> errors soon after, if I send a normal kill signal things seem fine.
>>
>> CPU is Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz, on a HP 220z workstation.
>>
>> I initially blamed bad RAM but this reproduces everytime, and I
>> swapped DIMMs around
>>
>> I haven't tested with upstream kernel/qemu yet, but I wondered if
>> anyone else has seen this.
>>
>> I noticed this because some work I was doing was segfaulting my qemu
>> and then my machine would die a few mins later.
> 
> Of course now I read my fedora kernel emails and notice vhost_net does
> bad things,
> 
> disabling vhost_net seems to make it work fine, hopefully the next
> Fedora kernel will bring the magic fixes.
> 

That issue and another nasty crasher are being tracked here:

https://bugzilla.redhat.com/show_bug.cgi?id=980254

- Cole