[libvirt] libvirt-0.9.1 to 0.9.3-r1: managedsave/save won't start/restore at saved state

[Laine Stump]

On 07/27/2011 04:37 AM, Nicolas Sebrecht wrote:
> I'm seeing strange behaviour, here.  Any guests saved using both
> managedsave and save commands from virsh won't restore at saved state. A
> new full boot sequence happen.
>
> - Tested against libvirt v0.9.1, v0.9.2, v0.9.3-r1 (Gentoo)
> - Confirmed on three different hosts Gentoo amd64 systems.
> - Tested with gentoo and ubuntu guests.
> - Nothing relevant in /var/log/libvirt/libvirt.log or
> /var/log/libvirt/qemu/<dom>.log
>
> The "state file" /var/lib/libvirt/qemu/save/<dom>.save exists and is
> deleted when 'virsh start' is called.
>
> The new boot sequence is confirmed by :
> - VNC console checks
> - previous screen sessions lost
> - uptime
>
> I've open a bug at https://bugs.gentoo.org/show_bug.cgi?id=376333 but
> had no answer.
>
> Any idea on what could happen or how to inspect it?

If you pause ("virsh suspend") the guest before the save, can you then 
successfully start the domain (it should "start" in a paused state, and 
when the virsh commandline returns to the prompt, you can resume it with 
"virsh resume".) If this is the case, it could be a race condition 
within qemu.