Comment 26 for bug 1865754

Corey,
My apologies for the previous comment please disregard, I forgot that I needed to run upgrade rather than install.

after running
sudo apt-get upgrade os-brick-common/focal-proposed python3-os-brick/focal-proposed
Reading package lists... Done
Building dependency tree
Reading state information... Done
Selected version '3.0.1-0ubuntu1.3' (Ubuntu:20.04/focal-proposed [all]) for 'os-brick-common'
Selected version '3.0.1-0ubuntu1.3' (Ubuntu:20.04/focal-proposed [all]) for 'python3-os-brick'
Calculating upgrade... Done
The following packages will be upgraded:
  os-brick-common python3-os-brick
2 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Inst python3-os-brick [3.0.1-0ubuntu1.2] (3.0.1-0ubuntu1.3 Ubuntu:20.04/focal-proposed [all]) []
Inst os-brick-common [3.0.1-0ubuntu1.2] (3.0.1-0ubuntu1.3 Ubuntu:20.04/focal-proposed [all])
Conf python3-os-brick (3.0.1-0ubuntu1.3 Ubuntu:20.04/focal-proposed [all])
Conf os-brick-common (3.0.1-0ubuntu1.3 Ubuntu:20.04/focal-proposed [all])

and restarting cinder services
I am able to perform cinder backups and restore cinder backups, but it looks like there may be another issue with creating a snapshot and then creating a backup from the snapshot and then restoring that backup.

As a side note spawning a new instance from a snapshot, which creates a new volume works just fine.

Here are the logs from a failed restore, when restoring a backup that was created from a volume snapshot

2020-10-06 18:38:17.002 951 ERROR cinder.backup.manager [req-ff639558-c9ae-4dd3-923d-ec158b08f3dc 78af964f6db708aebd4103b6ee7fbdfe2d30f6e775a0a007ee04cd4633ccb87d aea00f20ec77483d963d2e8f54a1132a - e5bf6979cc0e42fa86ce5be4f12241f1 e5bf6979cc0e42fa86ce5be4f12241f1] Restoring backup 9574fcbf-fe7c-41f9-8d28-dc46e3643aae to volume a0fd2623-9ab0-402e-a9da-d7bcc4bd3247 failed.: rbd.ImageNotFound: [errno 2] RBD image not found (error opening image b'volume-a97b9aaa-bcce-4ac2-ab84-60a6f07f4be2.backup.base' at snapshot None)
2020-10-06 18:38:17.002 951 ERROR cinder.backup.manager Traceback (most recent call last):
2020-10-06 18:38:17.002 951 ERROR cinder.backup.manager File "/usr/lib/python3/dist-packages/cinder/backup/manager.py", line 657, in _run_restore
2020-10-06 18:38:17.002 951 ERROR cinder.backup.manager backup_service.restore(backup, volume.id,
2020-10-06 18:38:17.002 951 ERROR cinder.backup.manager File "/usr/lib/python3/dist-packages/cinder/backup/drivers/ceph.py", line 1264, in restore
2020-10-06 18:38:17.002 951 ERROR cinder.backup.manager self._restore_volume(backup, target_volume, volume_file)
2020-10-06 18:38:17.002 951 ERROR cinder.backup.manager File "/usr/lib/python3/dist-packages/cinder/backup/drivers/ceph.py", line 1230, in _restore_volume
2020-10-06 18:38:17.002 951 ERROR cinder.backup.manager self._full_restore(backup, volume_file, volume.name,
2020-10-06 18:38:17.002 951 ERROR cinder.backup.manager File "/usr/lib/python3/dist-packages/cinder/backup/drivers/ceph.py", line 1023, in _full_restore
2020-10-06 18:38:17.002 951 ERROR cinder.backup.manager src_rbd = eventlet.tpool.Proxy(self.rbd.Image(client.ioctx,
2020-10-06 18:38:17.002 951 ERROR cinder.backup.manager File "rbd.pyx", line 3376, in rbd.Image.__init__
2020-10-06 18:38:17.002 951 ERROR cinder.backup.manager rbd.ImageNotFound: [errno 2] RBD image not found (error opening image b'volume-a97b9aaa-bcce-4ac2-ab84-60a6f07f4be2.backup.base' at snapshot None)
2020-10-06 18:38:17.002 951 ERROR cinder.backup.manager
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server [req-ff639558-c9ae-4dd3-923d-ec158b08f3dc 78af964f6db708aebd4103b6ee7fbdfe2d30f6e775a0a007ee04cd4633ccb87d aea00f20ec77483d963d2e8f54a1132a - e5bf6979cc0e42fa86ce5be4f12241f1 e5bf6979cc0e42fa86ce5be4f12241f1] Exception during message handling: rbd.ImageNotFound: [errno 2] RBD image not found (error opening image b'volume-a97b9aaa-bcce-4ac2-ab84-60a6f07f4be2.backup.base' at snapshot None)
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/oslo_messaging/rpc/server.py", line 165, in _process_incoming
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server res = self.dispatcher.dispatch(message)
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/oslo_messaging/rpc/dispatcher.py", line 276, in dispatch
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server return self._do_dispatch(endpoint, method, ctxt, args)
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/oslo_messaging/rpc/dispatcher.py", line 196, in _do_dispatch
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server result = func(ctxt, **new_args)
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/cinder/backup/manager.py", line 597, in restore_backup
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server backup.save()
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server self.force_reraise()
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server six.reraise(self.type_, self.value, self.tb)
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server raise value
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/cinder/backup/manager.py", line 586, in restore_backup
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server self._run_restore(context, backup, volume)
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/cinder/backup/manager.py", line 657, in _run_restore
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server backup_service.restore(backup, volume.id,
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/cinder/backup/drivers/ceph.py", line 1264, in restore
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server self._restore_volume(backup, target_volume, volume_file)
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/cinder/backup/drivers/ceph.py", line 1230, in _restore_volume
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server self._full_restore(backup, volume_file, volume.name,
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server File "/usr/lib/python3/dist-packages/cinder/backup/drivers/ceph.py", line 1023, in _full_restore
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server src_rbd = eventlet.tpool.Proxy(self.rbd.Image(client.ioctx,
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server File "rbd.pyx", line 3376, in rbd.Image.__init__
2020-10-06 18:38:17.081 951 ERROR oslo_messaging.rpc.server rbd.ImageNotFound: [errno 2] RBD image not found (error opening image b'volume-a97b9aaa-bcce-4ac2-ab84-60a6f07f4be2.backup.base' at snapshot None)