Hey guys:

I have a running vm with ceph backend:

root@apc20-005:~# virsh list
 Id Name                 State
----------------------------------
 56 one-240              running

And snapshot-create-as works well:

root@apc20-005:~# virsh snapshot-create-as one-240
Domain snapshot 1380009353 created

But when exec snapshot-revert, error occurs:

root@apc20-005:~# virsh snapshot-revert one-240 1380009353
error: operation failed: Error -22 while loading VM state

And the vm went paused state.

root@apc20-005:~# virsh list
 Id Name                 State
----------------------------------
 56 one-240              paused


When I use qcow2 image backend, Everything is ok! Any idea?