virsh restore causes kernel panic in guest.

[Jarl]

Hi. I use ubuntu-server 9.04 as host and ubuntu(JeOS) 9.04 as guest.

When I use virsh save followed by virsh restore, the guest OS results in a kernel panic.

Jarl

[Chuck Short (zulcss)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please answer these questions:
1. Is this reproducible?
2. If so, what specific steps should we take to recreate this bug? Be as detailed as possible.
This will help us to find and resolve the problem.

[Chuck Short (zulcss)]

We'd like to figure out what's causing this bug for you, but we haven't heard back from you in a while. Could you please provide the requested information? Thanks!

[Jarl (jarl-dk)]

Here are steps to reproduce:

sudo vmbuilder kvm ubuntu --libvirt qemu:///system --mirror=http://dk.archive.ubuntu.com/ubuntu --hostname ubu-test
virsh start ubu-test
virsh save ubu-test save_dir/ubu-test_save
virsh restore save_dir/ubu-test_save

After this when I open virt-viewer, everything looks normal, but when I hit any key, the kernel crashes, here is a screendump from virt-viewer.

[Jamie Strandboge (jdstrand)]

This is fixed in 0.7.5-5ubuntu15 (in Lucid).

[Dig Ge (dig-ge-cn)]

Hi all,

  I can reproduce this issue on lucid x86_64.

Environment:
  Host: Ubuntu Lucid x86_64 desktop with kernel "2.6.38-10-generic #46-Ubuntu SMP Tue Jun 28 15:07:17 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux"

ii kvm 1:84+dfsg-0ubuntu16+0.14.0+noroms+0ubuntu4.4
ii libvirt-bin 0.8.8-1ubuntu6.5
ii libvirt0 0.8.8-1ubuntu6.5
ii libvirtodbc0 6.1.2+dfsg1-1ubuntu4
ii python-libvirt 0.8.8-1ubuntu6.5
ii qemu 0.14.0+noroms-0ubuntu4.4
ii qemu-common 0.14.0+noroms-0ubuntu4.4
ii qemu-kvm 0.14.0+noroms-0ubuntu4.4

  Guest: Ubuntu Lucid x86_64 server

Steps:
 1. run "virt-manager",
 2. start a guest,
 3. click "Save" in "Virtual Machine" menu, and wait a progress dialog done,
 4. click "Restore" in "Virtual Machine" menu
Expect result:
 VM restored
Actually:
 Show a error dialog with following information:

Error restoring domain: operation failed: could not query memory balloon allocation

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 45, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/engine.py", line 956, in asyncfunc
    vm.startup()
  File "/usr/share/virt-manager/virtManager/domain.py", line 1049, in startup
    self._update_status()
  File "/usr/share/virt-manager/virtManager/domain.py", line 1274, in _update_status
    info = self.get_info()
  File "/usr/share/virt-manager/virtManager/domain.py", line 967, in get_info
    return self._backend.info()
  File "/usr/lib/python2.7/dist-packages/libvirt.py", line 823, in info
    if ret is None: raise libvirtError ('virDomainGetInfo() failed', dom=self)
libvirtError: operation failed: could not query memory balloon allocation