Cinder failed to create a backup from snapshot with NFS volume driver

[Alex Deiter]

Following are the steps to reproduce the issue:

0. Deploy DevStack Master

1. Configure a NFS backend for Cinder volume service:

/etc/cinder/cinder.conf:
[DEFAULT]
default_volume_type = nfs
enabled_backends = nfs

[nfs]
volume_driver = cinder.volume.drivers.nfs.NfsDriver
volume_backend_name = nfs
nfs_snapshot_support = True
nas_host = 10.3.35.41
nas_share_path = /volumes/pool1/nas

2. Configure a NFS backend for Cinder backup service:

/etc/cinder/cinder.conf:

[DEFAULT]
backup_driver = cinder.backup.drivers.nfs.NFSBackupDriver
backup_share = 10.3.35.43:/volumes/pool1/backup

3. Create a volume:
$ cinder create --volume-type nfs 1

4. Create a snapshot for the volume:
$ cinder snapshot-create afca7d24-e90e-410f-8e9f-ffd3ac8a4a19

5. Try to backup the volume using the snapshot:
$ cinder backup-create --snapshot-id 4daa8f03-43e7-4e2d-a688-a2beb675ac4f afca7d24-e90e-410f-8e9f-ffd3ac8a4a19

Expected result:
Success

Actual result:
Backup failed with error state.

Cinder volume service log:
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/oslo_messaging/rpc/server.py", line 165, in _process_incoming
    res = self.dispatcher.dispatch(message)
  File "/usr/local/lib/python3.6/dist-packages/oslo_messaging/rpc/dispatcher.py", line 273, in dispatch
    return self._do_dispatch(endpoint, method, ctxt, args)
  File "/usr/local/lib/python3.6/dist-packages/oslo_messaging/rpc/dispatcher.py", line 193, in _do_dispatch
    result = func(ctxt, **new_args)
  File "/opt/stack/cinder/cinder/volume/manager.py", line 4455, in get_backup_device
    self.driver.get_backup_device(ctxt, backup))
  File "/opt/stack/cinder/cinder/volume/driver.py", line 1203, in get_backup_device
    context, backup)
  File "/opt/stack/cinder/cinder/volume/driver.py", line 1231, in _get_backup_volume_temp_volume
    context, volume, snapshot)
  File "/opt/stack/cinder/cinder/volume/driver.py", line 1368, in _create_temp_volume_from_snapshot
    temp_vol_ref.destroy()
  File "/usr/local/lib/python3.6/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
    self.force_reraise()
  File "/usr/local/lib/python3.6/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
    six.reraise(self.type_, self.value, self.tb)
  File "/usr/local/lib/python3.6/dist-packages/six.py", line 703, in reraise
    raise value
  File "/opt/stack/cinder/cinder/volume/driver.py", line 1363, in _create_temp_volume_from_snapshot
    snapshot)
  File "<decorator-gen-735>", line 2, in create_volume_from_snapshot
  File "/opt/stack/cinder/cinder/coordination.py", line 151, in _synchronized
    return f(*a, **k)
  File "/opt/stack/cinder/cinder/volume/drivers/remotefs.py", line 1884, in create_volume_from_snapshot
    return self._create_volume_from_snapshot(volume, snapshot)
  File "/opt/stack/cinder/cinder/volume/drivers/remotefs.py", line 1384, in _create_volume_from_snapshot
    raise exception.InvalidSnapshot(msg)
cinder.exception.InvalidSnapshot: Snapshot status must be "available" to clone. But is: backing-up

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/743040

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/743040
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=a21bf41413b8e5b56c1a61460039ec7609f45042
Submitter: Zuul
Branch: master

commit a21bf41413b8e5b56c1a61460039ec7609f45042
Author: Alex Deiter <email address hidden>
Date: Sat Jul 25 18:18:14 2020 +0000

    Fixed an issue with creating a backup from snapshot with NFS volume driver.

    Change-Id: Ib198372bf3e125a88d607c71377c95a24ab584ad
    Closes-Bug: 1888951

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 18.0.0.0b1 development milestone.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 17.1.0 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 16.3.0 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 15.5.0 release.