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[Bug 1885418] [NEW] libvirt.libvirtError: unable to verify existence of block copy target: Permission denied

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Public bug reported:

Creating a live snapshot of local root volume storage fails with the
following error:


2020-06-28 06:21:03.673 167084 INFO nova.compute.manager [req-1af43725-b524-47ce-8ed6-d3a9dffdc65c 220423f8f62241b59a4f7cf5ee2e41a2 b2e1e496515948598349f8ea7ec7c2c9 - ba00b19e5674426caf6ea12d5fecfad1 ba00b19e5674426caf6ea12d5fecfad1] [instance: 17be6008-70f9-4669-bfd5-e1017b2467f3] instance snapshotting
2020-06-28 06:21:03.771 167084 INFO nova.virt.libvirt.driver [req-1af43725-b524-47ce-8ed6-d3a9dffdc65c 220423f8f62241b59a4f7cf5ee2e41a2 b2e1e496515948598349f8ea7ec7c2c9 - ba00b19e5674426caf6ea12d5fecfad1 ba00b19e5674426caf6ea12d5fecfad1] [instance: 17be6008-70f9-4669-bfd5-e1017b2467f3] Beginning live snapshot process
2020-06-28 06:21:04.053 167084 INFO nova.virt.libvirt.driver [req-1af43725-b524-47ce-8ed6-d3a9dffdc65c 220423f8f62241b59a4f7cf5ee2e41a2 b2e1e496515948598349f8ea7ec7c2c9 - ba00b19e5674426caf6ea12d5fecfad1 ba00b19e5674426caf6ea12d5fecfad1] [instance: 17be6008-70f9-4669-bfd5-e1017b2467f3] Skipping quiescing instance: QEMU guest agent is not enabled.
2020-06-28 06:21:04.256 167084 INFO nova.compute.manager [req-1af43725-b524-47ce-8ed6-d3a9dffdc65c 220423f8f62241b59a4f7cf5ee2e41a2 b2e1e496515948598349f8ea7ec7c2c9 - ba00b19e5674426caf6ea12d5fecfad1 ba00b19e5674426caf6ea12d5fecfad1] [instance: 17be6008-70f9-4669-bfd5-e1017b2467f3] Successfully reverted task state from image_pending_upload on failure for instance.
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server [req-1af43725-b524-47ce-8ed6-d3a9dffdc65c 220423f8f62241b59a4f7cf5ee2e41a2 b2e1e496515948598349f8ea7ec7c2c9 - ba00b19e5674426caf6ea12d5fecfad1 ba00b19e5674426caf6ea12d5fecfad1] Exception during message handling: libvirt.libvirtError: unable to verify existence of block copy target: Permission denied
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/virt/libvirt/driver.py", line 2351, in snapshot
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     metadata['location'] = root_disk.direct_snapshot(
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/virt/libvirt/imagebackend.py", line 452, in direct_snapshot
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     raise NotImplementedError(_('direct_snapshot() is not implemented'))
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server NotImplementedError: direct_snapshot() is not implemented
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server During handling of the above exception, another exception occurred:
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_messaging/rpc/server.py", line 165, in _process_incoming
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_messaging/rpc/dispatcher.py", line 276, in dispatch
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_messaging/rpc/dispatcher.py", line 196, in _do_dispatch
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/exception_wrapper.py", line 77, in wrapped
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     _emit_exception_notification(
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self.force_reraise()
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     raise value
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/exception_wrapper.py", line 69, in wrapped
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     return f(self, context, *args, **kw)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 188, in decorated_function
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     LOG.warning("Failed to revert task state for instance. "
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self.force_reraise()
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     raise value
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 159, in decorated_function
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/utils.py", line 1447, in decorated_function
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 216, in decorated_function
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     compute_utils.add_instance_fault_from_exc(context,
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self.force_reraise()
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     raise value
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 205, in decorated_function
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 3844, in backup_instance
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self._do_snapshot_instance(context, image_id, instance)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 236, in decorated_function
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     compute_utils.delete_image(
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self.force_reraise()
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     raise value
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 232, in decorated_function
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     return function(self, context, image_id, instance,
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 3830, in _do_snapshot_instance
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self._snapshot_instance(context, image_id, instance,
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 3912, in _snapshot_instance
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self.driver.snapshot(context, instance, image_id,
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/virt/libvirt/driver.py", line 2390, in snapshot
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self._live_snapshot(context, instance, guest,
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/virt/libvirt/driver.py", line 2599, in _live_snapshot
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     dev.rebase(disk_delta, copy=True, reuse_ext=True, shallow=True)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/virt/libvirt/guest.py", line 796, in rebase
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     return self._guest._domain.blockRebase(
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/eventlet/tpool.py", line 193, in doit
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     result = proxy_call(self._autowrap, f, *args, **kwargs)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/eventlet/tpool.py", line 151, in proxy_call
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     rv = execute(f, *args, **kwargs)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/eventlet/tpool.py", line 132, in execute
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     six.reraise(c, e, tb)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     raise value
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/eventlet/tpool.py", line 86, in tworker
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     rv = meth(*args, **kwargs)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/libvirt.py", line 1079, in blockRebase
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     if ret == -1: raise libvirtError ('virDomainBlockRebase() failed', dom=self)
2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server libvirt.libvirtError: unable to verify existence of block copy target: Permission denied

Latest OpenStack Ussuri on Ubuntu 20.04 + libvirtd 6.0.0 and Python
3.8.2

** Affects: nova
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of Yahoo!
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https://bugs.launchpad.net/bugs/1885418

Title:
  libvirt.libvirtError: unable to verify existence of block copy target:
  Permission denied

Status in OpenStack Compute (nova):
  New

Bug description:
  Creating a live snapshot of local root volume storage fails with the
  following error:

  
  2020-06-28 06:21:03.673 167084 INFO nova.compute.manager [req-1af43725-b524-47ce-8ed6-d3a9dffdc65c 220423f8f62241b59a4f7cf5ee2e41a2 b2e1e496515948598349f8ea7ec7c2c9 - ba00b19e5674426caf6ea12d5fecfad1 ba00b19e5674426caf6ea12d5fecfad1] [instance: 17be6008-70f9-4669-bfd5-e1017b2467f3] instance snapshotting
  2020-06-28 06:21:03.771 167084 INFO nova.virt.libvirt.driver [req-1af43725-b524-47ce-8ed6-d3a9dffdc65c 220423f8f62241b59a4f7cf5ee2e41a2 b2e1e496515948598349f8ea7ec7c2c9 - ba00b19e5674426caf6ea12d5fecfad1 ba00b19e5674426caf6ea12d5fecfad1] [instance: 17be6008-70f9-4669-bfd5-e1017b2467f3] Beginning live snapshot process
  2020-06-28 06:21:04.053 167084 INFO nova.virt.libvirt.driver [req-1af43725-b524-47ce-8ed6-d3a9dffdc65c 220423f8f62241b59a4f7cf5ee2e41a2 b2e1e496515948598349f8ea7ec7c2c9 - ba00b19e5674426caf6ea12d5fecfad1 ba00b19e5674426caf6ea12d5fecfad1] [instance: 17be6008-70f9-4669-bfd5-e1017b2467f3] Skipping quiescing instance: QEMU guest agent is not enabled.
  2020-06-28 06:21:04.256 167084 INFO nova.compute.manager [req-1af43725-b524-47ce-8ed6-d3a9dffdc65c 220423f8f62241b59a4f7cf5ee2e41a2 b2e1e496515948598349f8ea7ec7c2c9 - ba00b19e5674426caf6ea12d5fecfad1 ba00b19e5674426caf6ea12d5fecfad1] [instance: 17be6008-70f9-4669-bfd5-e1017b2467f3] Successfully reverted task state from image_pending_upload on failure for instance.
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server [req-1af43725-b524-47ce-8ed6-d3a9dffdc65c 220423f8f62241b59a4f7cf5ee2e41a2 b2e1e496515948598349f8ea7ec7c2c9 - ba00b19e5674426caf6ea12d5fecfad1 ba00b19e5674426caf6ea12d5fecfad1] Exception during message handling: libvirt.libvirtError: unable to verify existence of block copy target: Permission denied
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/virt/libvirt/driver.py", line 2351, in snapshot
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     metadata['location'] = root_disk.direct_snapshot(
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/virt/libvirt/imagebackend.py", line 452, in direct_snapshot
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     raise NotImplementedError(_('direct_snapshot() is not implemented'))
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server NotImplementedError: direct_snapshot() is not implemented
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server During handling of the above exception, another exception occurred:
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_messaging/rpc/server.py", line 165, in _process_incoming
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_messaging/rpc/dispatcher.py", line 276, in dispatch
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_messaging/rpc/dispatcher.py", line 196, in _do_dispatch
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/exception_wrapper.py", line 77, in wrapped
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     _emit_exception_notification(
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self.force_reraise()
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     raise value
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/exception_wrapper.py", line 69, in wrapped
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     return f(self, context, *args, **kw)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 188, in decorated_function
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     LOG.warning("Failed to revert task state for instance. "
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self.force_reraise()
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     raise value
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 159, in decorated_function
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/utils.py", line 1447, in decorated_function
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 216, in decorated_function
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     compute_utils.add_instance_fault_from_exc(context,
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self.force_reraise()
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     raise value
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 205, in decorated_function
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 3844, in backup_instance
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self._do_snapshot_instance(context, image_id, instance)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 236, in decorated_function
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     compute_utils.delete_image(
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self.force_reraise()
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     raise value
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 232, in decorated_function
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     return function(self, context, image_id, instance,
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 3830, in _do_snapshot_instance
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self._snapshot_instance(context, image_id, instance,
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/compute/manager.py", line 3912, in _snapshot_instance
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self.driver.snapshot(context, instance, image_id,
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/virt/libvirt/driver.py", line 2390, in snapshot
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     self._live_snapshot(context, instance, guest,
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/virt/libvirt/driver.py", line 2599, in _live_snapshot
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     dev.rebase(disk_delta, copy=True, reuse_ext=True, shallow=True)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/nova/virt/libvirt/guest.py", line 796, in rebase
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     return self._guest._domain.blockRebase(
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/eventlet/tpool.py", line 193, in doit
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     result = proxy_call(self._autowrap, f, *args, **kwargs)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/eventlet/tpool.py", line 151, in proxy_call
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     rv = execute(f, *args, **kwargs)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/eventlet/tpool.py", line 132, in execute
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     six.reraise(c, e, tb)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/six.py", line 703, in reraise
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     raise value
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/eventlet/tpool.py", line 86, in tworker
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     rv = meth(*args, **kwargs)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3/dist-packages/libvirt.py", line 1079, in blockRebase
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server     if ret == -1: raise libvirtError ('virDomainBlockRebase() failed', dom=self)
  2020-06-28 06:21:04.259 167084 ERROR oslo_messaging.rpc.server libvirt.libvirtError: unable to verify existence of block copy target: Permission denied

  Latest OpenStack Ussuri on Ubuntu 20.04 + libvirtd 6.0.0 and Python
  3.8.2

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