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

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Message-ID: <CAPM=9tzT3EaZm=BRxxQe8+u-VtE8_F72-6X9ZJbLgnX7XMV7Vw@mail.gmail.com>
Date:	Tue, 9 Jul 2013 11:11:35 +1000
From:	Dave Airlie <airlied@...il.com>
To:	qemu-devel@...gnu.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: sending SEGV to qemu crashes host kernel in Fedora 19

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.

Dave.
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