Kernel Panic on FreeBSD guests with libvirt 1.2.2 and qemu 1.7.91

[Juergen Lock]

In article <f946e633356b1161c0d43217f59893b9 at drenet.net> you write:
>On 05/01/2014 11:00 am, Andre Goree wrote:
>> Hello,
>> 
>> I'm running libvirt 1.2.2 and QEMU 1.7.91 on an Ubuntu 12.04LTS host.
>> Prior to a recent upgrade, I've been able to run FreeBSD guests (both
>> 10.0 and 9.2) perfectly fine without issue.  Now, this the
>> aforementioned versions, I'm running into a kernel panic almost
>> immediately after booting, same message with both 10.0 & 9.2:  "Fatal
>> trap 12: page fault while in kernel mode".
>> 
>> To ensure that it had nothing to do with my configuration [of the
>> guest OS] I've tried installing the guest from guest using
>> virt-install, however I still run into the same kernel panic.  It'll
>> be hard for me to post the output of the panic, so I'll try to show as
>> much info as possible via images[1].
>> 
>> Upon researching, I've come across a few threads (e.g., this one[2])
>> that appear to be related, but none have helped.  Any information that
>> you can provide to help me get to the root of this issue would be
>> greatly appreciated!
>> 
>> [1]http://www.drenet.net/images/panic1.png
>> http://www.drenet.net/images/panic2.png
>> http://www.drenet.net/images/panic_noacpi1.png
>> http://www.drenet.net/images/panic_noacpi2.png
>> 
>> [2]http://forums.freebsd.org/viewtopic.php?t=36761
>
>
>After using my noggin a bit, I've determine the culprit to be atkbd.  If 
>I disable it via the bootloader with "set hint.atkbd.0.disabled=1", the 
>vm will boot fine.  HOWEVER, my problem then is that I cannot use the 
>keyboard via VNC.  I'm trying to figure out ways around this...any help 
>would be much appreciated.  I've already tried setting different flags 
>for atkbd, but no matter which flag I set, I get the kernel panic -- 
>ostensibly because atkbd is enabled (as it must be for a flag to be set 
>for it).
>
I think you have hit this issue for which the workaround is a patch
to seabios:

	https://bugs.debian.org/cgi-bin/bugreport.cgi?bug

	http://git.qemu.org/?p=seabios.git;a=commit;h=8032b8a0fec550de5cb2f7d37aa031cebc2200c3

 References:

	http://article.gmane.org/gmane.comp.emulators.qemu/254414/

	https://lists.gnu.org/archive/html/qemu-stable/2013-03/msg00037.html

 HTH, :)
	Juergen