Comment 5 for bug 1578036

I've got an error after patch:
2016-05-23 10:28:25.088 17726 INFO cinder.backup.drivers.ceph [req-06a0e581-c999-4efe-af86-31b3a47b3d7d 8d384cc45d0c467eb46ef3f980cf314d 3029462986ac400ca2c2c6ac4c9af5a7 - - -] RBD diff op failed - (ret=33 stderrImporting image diff: 0% complete...failed.
rbd: import-diff failed: (33) Numerical argument out of domain
)

each backup is full.