The relevant log is most likely:


2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server [req-a487eeb2-b7f9-4712-8a58-6cfcdf9836b4 c0aeae9dc16743558ee7e13bf4f432d9 3c00e69e1dc4414faa97b980e348e301 - default default] Excep
tion during message handling: libvirt.libvirtError: Unable to read from monitor: Connection reset by peer
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/driver.py", line 2494, in snapshot
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     instance.image_ref)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/imagebackend.py", line 452, in direct_snapshot
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     raise NotImplementedError(_('direct_snapshot() is not implemented'))
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server NotImplementedError: direct_snapshot() is not implemented
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server 
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server During handling of the above exception, another exception occurred:
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server 
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/oslo_messaging/rpc/server.py", line 165, in _process_incoming
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/oslo_messaging/rpc/dispatcher.py", line 309, in dispatch
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/oslo_messaging/rpc/dispatcher.py", line 229, in _do_dispatch
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/exception_wrapper.py", line 78, in wrapped
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     function_name, call_dict, binary)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     self.force_reraise()
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/six.py", line 703, in reraise
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     raise value
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/exception_wrapper.py", line 69, in wrapped
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     return f(self, context, *args, **kw)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 189, in decorated_function
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     "Error: %s", e, instance=instance)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     self.force_reraise()
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/six.py", line 703, in reraise
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     raise value
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 159, in decorated_function
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/compute/utils.py", line 1434, in decorated_function
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 217, in decorated_function

2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     kwargs['instance'], e, sys.exc_info())
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     self.force_reraise()
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/six.py", line 703, in reraise
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     raise value
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 205, in decorated_function
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 238, in decorated_function
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     log_exc_info=True)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     self.force_reraise()
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/six.py", line 703, in reraise
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     raise value
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 233, in decorated_function
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     *args, **kwargs)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 3952, in snapshot_instance
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     task_states.IMAGE_SNAPSHOT)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/compute/manager.py", line 3985, in _snapshot_instance
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     update_task_state)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/driver.py", line 2533, in snapshot
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     image_format, instance.image_meta)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/driver.py", line 2768, in _live_snapshot
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     while not dev.is_job_complete():
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/guest.py", line 864, in is_job_complete
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     status = self.get_job_info()
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/nova/virt/libvirt/guest.py", line 771, in get_job_info
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     status = self._guest._domain.blockJobInfo(self._disk, flags=0)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/eventlet/tpool.py", line 190, in doit
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     result = proxy_call(self._autowrap, f, *args, **kwargs)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/eventlet/tpool.py", line 148, in proxy_call
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     rv = execute(f, *args, **kwargs)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/eventlet/tpool.py", line 129, in execute
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     six.reraise(c, e, tb)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/six.py", line 703, in reraise
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     raise value
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib/python3.6/site-packages/eventlet/tpool.py", line 83, in tworker
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     rv = meth(*args, **kwargs)
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server   File "/usr/lib64/python3.6/site-packages/libvirt.py", line 999, in blockJobInfo
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server     raise libvirtError('virDomainGetBlockJobInfo() failed')
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server libvirt.libvirtError: Unable to read from monitor: Connection reset by peer
2022-01-25 13:13:35.560 8 ERROR oslo_messaging.rpc.server