Comment 1 for bug 1837955

This is the stack trace for this exception:

TRACE oslo_messaging.rpc.server Traceback (most recent call last):
TRACE oslo_messaging.rpc.server File "/usr/local/openstack/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 163, in _process_incoming
TRACE oslo_messaging.rpc.server res = self.dispatcher.dispatch(message)
TRACE oslo_messaging.rpc.server File "/usr/local/openstack/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 265, in dispatch
TRACE oslo_messaging.rpc.server return self._do_dispatch(endpoint, method, ctxt, args)
TRACE oslo_messaging.rpc.server File "/usr/local/openstack/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 194, in _do_dispatch
TRACE oslo_messaging.rpc.server result = func(ctxt, **new_args)
TRACE oslo_messaging.rpc.server File "/usr/local/openstack/lib/python2.7/site-packages/nova/conductor/manager.py", line 676, in build_instances
TRACE oslo_messaging.rpc.server raise exception.MaxRetriesExceeded(reason=msg)
TRACE oslo_messaging.rpc.server MaxRetriesExceeded: Exceeded maximum number of retries. Exhausted all hosts available for retrying build failures for instance X.