500 server error in message handling.

<180>Mar 23 23:42:05 node-11 nova-nova.compute.manager AUDIT: Terminating instance
<179>Mar 23 23:42:05 node-11 nova-nova.virt.libvirt.driver ERROR: During wait destroy, instance disappeared.
<182>Mar 23 23:42:05 node-11 nova-nova.virt.libvirt.firewall INFO: Attempted to unfilter instance which is not filtered
<182>Mar 23 23:42:05 node-11 nova-nova.virt.libvirt.driver INFO: Deletion of /var/lib/nova/instances/8da36640-63c2-450f-a301-ed7aa23aaa91 complete
<179>Mar 23 23:42:13 node-11 nova-nova.openstack.common.rpc.amqp ERROR: Exception during message handling
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/amqp.py", line 461, in _process_data
    **args)
  File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/dispatcher.py", line 172, in dispatch
    result = getattr(proxyobj, method)(ctxt, **kwargs)
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 353, in decorated_function
    return function(self, context, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 90, in wrapped
    payload)
  File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 73, in wrapped
    return f(self, context, *args, **kw)
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 243, in decorated_function
    pass
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 229, in decorated_function
    return function(self, context, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 294, in decorated_function
    function(self, context, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 271, in decorated_function
    e, sys.exc_info())
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 258, in decorated_function
    return function(self, context, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1802, in terminate_instance
    do_terminate_instance(instance, bdms)
  File "/usr/lib/python2.7/dist-packages/nova/openstack/common/lockutils.py", line 246, in inner
    return f(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1794, in do_terminate_instance
    reservations=reservations)
  File "/usr/lib/python2.7/dist-packages/nova/hooks.py", line 105, in inner
    rv = f(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1767, in _delete_instance
    user_id=user_id)
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1739, in _delete_instance
    self._shutdown_instance(context, db_inst, bdms)
  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1683, in _shutdown_instance
    connector)
  File "/usr/lib/python2.7/dist-packages/nova/volume/cinder.py", line 176, in wrapper
    res = method(self, ctx, volume_id, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/nova/volume/cinder.py", line 279, in terminate_connection
    connector)
  File "/usr/lib/python2.7/dist-packages/cinderclient/v1/volumes.py", line 316, in terminate_connection
    {'connector': connector})
  File "/usr/lib/python2.7/dist-packages/cinderclient/v1/volumes.py", line 237, in _action
    return self.api.client.post(url, body=body)
  File "/usr/lib/python2.7/dist-packages/cinderclient/client.py", line 210, in post
    return self._cs_request(url, 'POST', **kwargs)
  File "/usr/lib/python2.7/dist-packages/cinderclient/client.py", line 174, in _cs_request
    **kwargs)
  File "/usr/lib/python2.7/dist-packages/cinderclient/client.py", line 157, in request
    raise exceptions.from_response(resp, body)
ClientException: The server has either erred or is incapable of performing the requested operation. (HTTP 500) (Request-ID: req-85c30ae5-3482-4e08-94f6-028b55a9f561)
<180>Mar 23 23:42:15 node-11 nova-nova.compute.resource_tracker AUDIT: Auditing locally available compute resources
<180>Mar 23 23:42:15 node-11 nova-nova.compute.resource_tracker AUDIT: Free ram (MB): 10641
<180>Mar 23 23:42:15 node-11 nova-nova.compute.resource_tracker AUDIT: Free disk (GB): 860
<180>Mar 23 23:42:15 node-11 nova-nova.compute.resource_tracker AUDIT: Free VCPUS: 5
<182>Mar 23 23:42:15 node-11 nova-nova.compute.resource_tracker INFO: Compute_service record updated for node-11:node-11