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[Bug 1450658] Re: VolumeBackendAPIException during _shutdown_instance are not handled

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: jichenjc <jichenjc@xxxxxxxxxx>
Date: Mon, 04 May 2015 15:43:49 -0000
Reply-to: Bug 1450658 <1450658@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Also affects: python-cinderclient
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1450658

Title:
  VolumeBackendAPIException during _shutdown_instance are not handled

Status in OpenStack Compute (Nova):
  Confirmed
Status in Python client library for Cinder:
  New

Bug description:
  Use rally for cinder boot from voume test, after test completed, found a lot of VMs were deleted failed with error status, manual retry a few times to delete VM, but can't work.
  [root@abba-n04 home]#  nova list --all-tenants
  +--------------------------------------+-----------------------------------+----------------------------------+--------+------------+-------------+----------+
  | ID                                   | Name                              | Tenant ID                        | Status | Task State | Power State | Networks |
  +--------------------------------------+-----------------------------------+----------------------------------+--------+------------+-------------+----------+
  | 335f2ca0-a86d-45a5-b4a6-4d4ea1930e89 | rally_novaserver_aftvfqejftusyflf | 3e87ac6d12264286a10ac68eb913dacb | ERROR  | -          | NOSTATE     |          |
  | 888aa512-07f0-42ad-ae5e-255bbca6fe34 | rally_novaserver_ajqhjxjxnjojelgm | 7e05339543e743c3b023cee8128bbbbe | ERROR  | -          | NOSTATE     |          |
  | 84b32483-2997-4a2a-8d75-236395b4ef2f | rally_novaserver_arycquunqovvyxnl | 3e87ac6d12264286a10ac68eb913dacb | ERROR  | -          | NOSTATE     |          |
  | 535f1ce1-63fe-4681-b215-e21d38f77fbb | rally_novaserver_arzjesynagiqfjgt | 3e87ac6d12264286a10ac68eb913dacb | ERROR  | -          | NOSTATE     |          |
  | 6ef3fa37-e5a9-4a21-8996-d291070c246a | rally_novaserver_aufevkgzvynumwwo | d37e8219a3de4e5b985828a0b959f1d6 | ERROR  | -          | NOSTATE     |          |
  | e5d2dc5f-6e86-43e2-8f1f-1a3f6d4951bc | rally_novaserver_ayzjeqcplouwcaht | d37e8219a3de4e5b985828a0b959f1d6 | ERROR  | -          | NOSTATE     |          |
  | 2dcb294a-e2cc-4989-9e87-74081f1567db | rally_novaserver_bbphsjrexkcgcjtt | 7e05339543e743c3b023cee8128bbbbe | ERROR  | -          | NOSTATE     |          |
  | 88053991-2fab-4442-86c7-7825ed47ff0a | rally_novaserver_beveqwdokixwdbgi | 3e87ac6d12264286a10ac68eb913dacb | ERROR  | -          | NOSTATE     |          |
  | 1e109862-34ea-4686-a099-28f5840244cf | rally_novaserver_bimlwsfkndjbrczv | d37e8219a3de4e5b985828a0b959f1d6 | ERROR  | -          | NOSTATE     |          |
  | 6143bbb2-d3eb-4635-9554-85b30fbb5aa5 | rally_novaserver_bmycsptyoicymdmb | 3e87ac6d12264286a10ac68eb913dacb | ERROR  | -          | NOSTATE     |          |
  | 5e9308ae-9736-485f-92b7-e6783c613ba1 | rally_novaserver_bsvcnsqeyawcnbgp | d37e8219a3de4e5b985828a0b959f1d6 | ERROR  | -          | NOSTATE     |          |
  | 13fb2413-15b6-41a3-a8a0-a0b775747261 | rally_novaserver_bvfyfnnixwgisbkk | d37e8219a3de4e5b985828a0b959f1d6 | ERROR  | -          | NOSTATE     |          |
  | d5ce6fa3-99b5-4d61-ac7c-4b5bc13d1c27 | rally_novaserver_cpbevhulxylepvql | 3e87ac6d12264286a10ac68eb913dacb | ERROR  | -          | NOSTATE     |          |
  | 23ce9007-ab43-4b57-8686-4aa1ce336f09 | rally_novaserver_cswudaopawepnmms | 7e05339543e743c3b023cee8128bbbbe | ERROR  | -          | NOSTATE     |          |

  [root@abba-n04 home]# nova delete 335f2ca0-a86d-45a5-b4a6-4d4ea1930e89
  Request to delete server 335f2ca0-a86d-45a5-b4a6-4d4ea1930e89 has been accepted.
  [root@abba-n04 home]# nova  list --all | grep  335f2ca0-a86d-45a5-b4a6-4d4ea1930e89
  | 335f2ca0-a86d-45a5-b4a6-4d4ea1930e89 | rally_novaserver_aftvfqejftusyflf | 3e87ac6d12264286a10ac68eb913dacb | ERROR  | -          | NOSTATE     |          |
  [root@abba-n04 home]#

  The system is using local LVM volumes attached via iSCSI.  It appears
  that something is going wrong when the attempt to detach the volume is
  being made:

  2015-04-29 07:26:02.680 21775 DEBUG oslo_concurrency.processutils [req-fec5ff89-5465-4e76-b573-6a5afc0d4ee2 a9d0160b91f2412d84972a615b7547dc 828348052e494d76a401f669f85829f3 - - -] Running cmd (subprocess): sudo cinder-rootwrap /etc/cinder/rootwrap.conf cinder-rtstool delete-initiator iqn.2010-10.org.openstack:volume-a2907017-dda6-4243-bc50-85fe2164f05f iqn.1994-05.com.redhat:734fb33285d0 execute /usr/lib/python2.7/site-packages/oslo_concurrency/processutils.py:199
  2015-04-29 07:26:02.813 21775 DEBUG oslo_concurrency.processutils [req-fec5ff89-5465-4e76-b573-6a5afc0d4ee2 a9d0160b91f2412d84972a615b7547dc 828348052e494d76a401f669f85829f3 - - -] CMD "sudo cinder-rootwrap /etc/cinder/rootwrap.conf cinder-rtstool delete-initiator iqn.2010-10.org.openstack:volume-a2907017-dda6-4243-bc50-85fe2164f05f iqn.1994-05.com.redhat:734fb33285d0" returned: 1 in 0.133s execute /usr/lib/python2.7/site-packages/oslo_concurrency/processutils.py:225
  2015-04-29 07:26:02.814 21775 DEBUG oslo_concurrency.processutils [req-fec5ff89-5465-4e76-b573-6a5afc0d4ee2 a9d0160b91f2412d84972a615b7547dc 828348052e494d76a401f669f85829f3 - - -] u'sudo cinder-rootwrap /etc/cinder/rootwrap.conf cinder-rtstool delete-initiator iqn.2010-10.org.openstack:volume-a2907017-dda6-4243-bc50-85fe2164f05f iqn.1994-05.com.redhat:734fb33285d0' failed. Not Retrying. execute /usr/lib/python2.7/site-packages/oslo_concurrency/processutils.py:258
  2015-04-29 07:26:02.815 21775 ERROR cinder.volume.targets.lio [req-fec5ff89-5465-4e76-b573-6a5afc0d4ee2 a9d0160b91f2412d84972a615b7547dc 828348052e494d76a401f669f85829f3 - - -] Failed to delete initiator iqn iqn.1994-05.com.redhat:734fb33285d0 to target.
  2015-04-29 07:26:02.816 21775 ERROR cinder.volume.manager [req-fec5ff89-5465-4e76-b573-6a5afc0d4ee2 a9d0160b91f2412d84972a615b7547dc 828348052e494d76a401f669f85829f3 - - -] Unable to terminate volume connection: Failed to detach iSCSI target for volume a2907017-dda6-4243-bc50-85fe2164f05f.
  2015-04-29 07:26:02.817 21775 ERROR oslo_messaging.rpc.dispatcher [req-fec5ff89-5465-4e76-b573-6a5afc0d4ee2 a9d0160b91f2412d84972a615b7547dc 828348052e494d76a401f669f85829f3 - - -] Exception during message handling: Bad or unexpected response from the storage volume backend API: Unable to terminate volume connection: Failed to detach iSCSI target for volume a2907017-dda6-4243-bc50-85fe2164f05f.
  2015-04-29 07:26:02.817 21775 TRACE oslo_messaging.rpc.dispatcher Traceback (most recent call last):
  2015-04-29 07:26:02.817 21775 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
  2015-04-29 07:26:02.817 21775 TRACE oslo_messaging.rpc.dispatcher     executor_callback))
  2015-04-29 07:26:02.817 21775 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
  2015-04-29 07:26:02.817 21775 TRACE oslo_messaging.rpc.dispatcher     executor_callback)
  2015-04-29 07:26:02.817 21775 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
  2015-04-29 07:26:02.817 21775 TRACE oslo_messaging.rpc.dispatcher     result = func(ctxt, **new_args)
  2015-04-29 07:26:02.817 21775 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/osprofiler/profiler.py", line 105, in wrapper
  2015-04-29 07:26:02.817 21775 TRACE oslo_messaging.rpc.dispatcher     return f(*args, **kwargs)
  2015-04-29 07:26:02.817 21775 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/cinder/volume/manager.py", line 1168, in terminate_connection
  2015-04-29 07:26:02.817 21775 TRACE oslo_messaging.rpc.dispatcher     raise exception.VolumeBackendAPIException(data=err_msg)
  2015-04-29 07:26:02.817 21775 TRACE oslo_messaging.rpc.dispatcher VolumeBackendAPIException: Bad or unexpected response from the storage volume backend API: Unable to terminate volume connection: Failed to detach iSCSI target for volume a2907017-dda6-4243-bc50-85fe2164f05f.

  This in turn causes issues for Nova:

  2015-04-29 07:26:03.455 18637 INFO nova.scheduler.client.report [req-c0ca7f2a-d2ff-4e6d-8841-06c860781c55 a9d0160b91f2412d84972a615b7547dc 828348052e494d76a401f669f85829f3 - - -] Compute_service record updated for ('abba-n04.private.cloud.com', 'abba-n04.private.cloud.com')
  2015-04-29 07:26:03.462 18637 ERROR oslo_messaging.rpc.dispatcher [req-c0ca7f2a-d2ff-4e6d-8841-06c860781c55 a9d0160b91f2412d84972a615b7547dc 828348052e494d76a401f669f85829f3 - - -] Exception during message handling: Internal Server Error (HTTP 500) (Request-ID: req-fec5ff89-5465-4e76-b573-6a5afc0d4ee2)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher Traceback (most recent call last):
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     executor_callback))
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     executor_callback)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     result = func(ctxt, **new_args)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 6853, in terminate_instance
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     reservations=reservations)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/exception.py", line 88, in wrapped
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     payload)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 85, in __exit__
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/exception.py", line 71, in wrapped
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     return f(self, context, *args, **kw)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 328, in decorated_function
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     LOG.warning(msg, e, instance_uuid=instance_uuid)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 85, in __exit__
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 299, in decorated_function
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 378, in decorated_function
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 356, in decorated_function
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     kwargs['instance'], e, sys.exc_info())
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 85, in __exit__
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 344, in decorated_function
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2792, in terminate_instance
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     do_terminate_instance(instance, bdms)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_concurrency/lockutils.py", line 445, in inner
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     return f(*args, **kwargs)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2790, in do_terminate_instance
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     self._set_instance_error_state(context, instance)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 85, in __exit__
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2780, in do_terminate_instance
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     self._delete_instance(context, instance, bdms, quotas)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/hooks.py", line 149, in inner
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     rv = f(*args, **kwargs)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2749, in _delete_instance
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     quotas.rollback()
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 85, in __exit__
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2719, in _delete_instance
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     self._shutdown_instance(context, instance, bdms)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2658, in _shutdown_instance
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     connector)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/volume/cinder.py", line 214, in wrapper
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     res = method(self, ctx, volume_id, *args, **kwargs)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/nova/volume/cinder.py", line 375, in terminate_connection
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     connector)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/cinderclient/v2/volumes.py", line 384, in terminate_connection
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     {'connector': connector})
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/cinderclient/v2/volumes.py", line 311, in _action
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     return self.api.client.post(url, body=body)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/cinderclient/client.py", line 91, in post
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     return self._cs_request(url, 'POST', **kwargs)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/cinderclient/client.py", line 85, in _cs_request
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     return self.request(url, method, **kwargs)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/cinderclient/client.py", line 80, in request
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     return super(SessionClient, self).request(*args, **kwargs)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/keystoneclient/adapter.py", line 200, in request
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     resp = super(LegacyJsonAdapter, self).request(*args, **kwargs)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/keystoneclient/adapter.py", line 89, in request
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     return self.session.request(url, method, **kwargs)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/keystoneclient/utils.py", line 318, in inner
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     return func(*args, **kwargs)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/keystoneclient/session.py", line 390, in request
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher     raise exceptions.from_response(resp, method, url)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher InternalServerError: Internal Server Error (HTTP 500) (Request-ID: req-fec5ff89-5465-4e76-b573-6a5afc0d4ee2)
  2015-04-29 07:26:03.462 18637 TRACE oslo_messaging.rpc.dispatcher

  It looks to me like the following code in nova/compute/manager.py
  _shutdown_instance() might need to be expanded:

          for bdm in vol_bdms:
              try:
                  # NOTE(vish): actual driver detach done in driver.destroy, so
                  #             just tell cinder that we are done with it.
                  connector = self.driver.get_volume_connector(instance)
                  self.volume_api.terminate_connection(context,
                                                       bdm.volume_id,
                                                       connector)
                  self.volume_api.detach(context, bdm.volume_id)
              except exception.DiskNotFound as exc:
                  LOG.debug('Ignoring DiskNotFound: %s', exc,
                            instance=instance)
              except exception.VolumeNotFound as exc:
                  LOG.debug('Ignoring VolumeNotFound: %s', exc,
                            instance=instance)
              except (cinder_exception.EndpointNotFound,
                      keystone_exception.EndpointNotFound) as exc:
                  LOG.warning(_LW('Ignoring EndpointNotFound: %s'), exc,
                              instance=instance)

  It looks to me like things are going wrong because it is getting the
  VolumeBackendAPIException and things fall apart from there.  It would
  make more sense to me, in the case of a volume exception, to log a
  warning and then keep cleaning up so we don't have a bunch of orphaned
  instances left around.

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References

[Bug 1450658] [NEW] VolumeBackendAPIException during _shutdown_instance are not handled
From: Jay Bryant, 2015-04-30