Open Stack

Hello everyone,
A new problem with creating snapshots appeared after I upgraded to Havana:
2013-10-25 14:49:32.329 22980 TRACE nova.openstack.common.rpc.amqp File "/usr/lib/python2.7/dist-packages/libvirt.py", line 646, in blockRebase
2013-10-25 14:49:32.329 22980 TRACE nova.openstack.common.rpc.amqp if ret == -1: raise libvirtError ('virDomainBlockRebase() failed', dom=self)
2013-10-25 14:49:32.329 22980 TRACE nova.openstack.common.rpc.amqp libvirtError: internal error: unable to execute QEMU command 'drive-mirror': Could not open '/var/lib/nova/instances/snapshots/tmp5DdrIO/236df3e170e64fabaeb3c7601e2d6c47.delta'

The directory /var/lib/nova/instances/snapshots/tmp5DdrIO does not exist immidiately after this error shows up.
Permissions to the parent directory are nova:nova 755, I believe they are correct.

This happens only to machines which are running. A snapshot of shut off machine works well.

Does anyone have any idea what might be configured wrong here?
I also submitted this as a bug: https://bugs.launchpad.net/nova/+bug/1244694

Regards,
Daniel

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