linux-kernel - Re: sending SEGV to qemu crashes host kernel in Fedora 19

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Message-ID: <CA+5PVA53RUZ2hStEP1bRW1GY3uL2ZnbLQC8Bs+fV+s7oNZDKrw@mail.gmail.com>
Date:	Tue, 9 Jul 2013 07:24:42 -0400
From:	Josh Boyer <jwboyer@...il.com>
To:	Dave Airlie <airlied@...il.com>
Cc:	qemu-devel@...gnu.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: sending SEGV to qemu crashes host kernel in Fedora 19

On Mon, Jul 8, 2013 at 9:11 PM, Dave Airlie <airlied@...il.com> wrote:
> On Tue, Jul 9, 2013 at 10:35 AM, Dave Airlie <airlied@...il.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.

We hope so too.  3.9.9-302.fc19 in koji should contain the fixes we
know about.  There's still another bug open that's tracking issues
with Windows guest VMs and vhost-net.

josh
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