As far as I can see, this should have been fixed in upstream QEMU by this
commit here:
http://git.qemu.org/?p=qemu.git;a=commitdiff;h=8cb6bfb54e91b1a31a
... so closing this issue now.
** Changed in: qemu
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/918791
Title:
qemu-kvm dies when using vmvga driver and unity in the guest
Status in QEMU:
Fix Released
Status in qemu-kvm package in Ubuntu:
Fix Released
Status in xserver-xorg-video-vmware package in Ubuntu:
Invalid
Status in qemu-kvm source package in Oneiric:
Won't Fix
Status in xserver-xorg-video-vmware source package in Oneiric:
Invalid
Status in qemu-kvm source package in Precise:
Fix Released
Status in xserver-xorg-video-vmware source package in Precise:
Invalid
Bug description:
=====================================================
SRU Justification:
1. impact: kvm crashes
2. Development fix: don't allow attempts to set_bit to negative offsets
3. Stable fix: same as development fix
4. Test case (see below)
5. Regression potential: if the patch is wrong, graphics for vmware vga over
vnc could get messed up
=====================================================
12.04's qemu-kvm has been unstable for me and Marc Deslauriers and I
figured out it has something to do with the interaction of qemu-kvm,
unity and the vmvga driver. This is a regression over qemu-kvm in
11.10.
TEST CASE:
1. start a VM that uses unity (eg, 11.04, 11.10 or 12.04). My tests use
unity-2d on an amd64 host and amd64 guests
2. on 11.04 and 11.10, open empathy via the messaging indicator and click
'Chat'. On 12.04, open empathy via the messaging indicator and click 'Chat',
close the empathy wizard, move the empathy window over the unity luancher (so
it autohides), then do 'ctrl+alt+t' to open a terminal
When the launcher tries to auto(un)hide, qemu-kvm dies with this:
[10574.958149] do_general_protection: 132 callbacks suppressed
[10574.958154] kvm[13192] general protection ip:7fab9680ea0f sp:7ffff4440148
error:0 in qemu-system-x86_64[7fab966c4000+2c9000]
Relevant libvirt xml:
<video>
<model type='vmvga' vram='9216' heads='1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02'
function='0x0'/>
</video>
If I change to using 'cirrus', then qemu-kvm no longer crashes. Eg:
<video>
<model type='cirrus' vram='9216' heads='1'/>
<alias name='video0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02'
function='0x0'/>
</video>
The workaround is therefore to use the cirrus driver instead of vmvga,
however being able to kill qemu-kvm in this manner is not ideal. Also,
unfortunately unity-2d does not run with with cirrus driver under
11.04, so the security and SRU teams are unable to properly test
updates in GUI applications under unity when using the current 12.04
qemu-kvm.
I tried to report this via apport, but apport complained about a CRC
error, so I could not.
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