When port-limit is reached , a port-create causes internal server error

When port-limit is reached, a port-create causes internal server instead of giving the right exception.

contrail-api log seems to indicate the right error message...but neutron shows internal server error :

root@nodec22:~# neutron port-create public_vn
Request Failed: internal server error while processing your request.
root@nodec22:~#

root@nodec22:~# neutron quota-show --tenant-id 3088e9aba97b4f2ea6050275fc890f5c
+---------------------+-------+
| Field | Value |
+---------------------+-------+
| floatingip | -1 |
| nat_instance | -1 |
| network | -1 |
| port | 1 |
| route_table | -1 |
| router | -1 |
| security_group | -1 |
| security_group_rule | -1 |
| subnet | -1 |
+---------------------+-------+
root@nodec22:~#

contrail-api log:
==============
<class 'cfgm_common.exceptions.PermissionDenied'>
Python 2.7.3: /usr/bin/python
Sun Aug 10 05:09:11 2014

A problem occurred in a Python script. Here is the sequence of
function calls leading up to the error, in the order they occurred.

 /usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_interface.py in plugin_create_port(self=<vnc_openstack.neutron_plugin_interface.NeutronPluginInterface object>, context={u'is_admin': True, u'operation': u'CREATE', u'roles': [u'_member_', u'admin'], u'tenant': u'41aed434c0e54dfbada529578ff39224', u'tenant_id': u'41aed434c0e54dfbada529578ff39224', u'type': u'port', u'user_id': u'f1bf306be7a94495a491d0e16999c102'}, port={u'fields': None, u'filters': None, u'resource': {u'admin_state_up': True, u'binding:host_id': u'nodeh5', u'device_id': u'b44a8d2d-510e-49c5-96db-3f5eaa81b0df', u'device_owner': u'compute:None', u'extra_dhcp_opts': None, u'name': u'', u'network_id': u'e376dbda-8ce7-40c8-983b-03beec6ae131', u'security_groups': [u'3619ff8e-a0d9-4529-9837-c087c723ae40'], u'tenant_id': u'3088e9aba97b4f2ea6050275fc890f5c'}})
  388 try:
  389 cfgdb = self._get_user_cfgdb(context)
  390 net_info = cfgdb.port_create(port['resource'])
  391 return net_info
  392 except Exception as e:
net_info undefined
cfgdb = <vnc_openstack.neutron_plugin_db.DBInterface object>
cfgdb.port_create = <bound method DBInterface.port_create of <vnc_openstack.neutron_plugin_db.DBInterface object>>
port = {u'fields': None, u'filters': None, u'resource': {u'admin_state_up': True, u'binding:host_id': u'nodeh5', u'device_id': u'b44a8d2d-510e-49c5-96db-3f5eaa81b0df', u'device_owner': u'compute:None', u'extra_dhcp_opts': None, u'name': u'', u'network_id': u'e376dbda-8ce7-40c8-983b-03beec6ae131', u'security_groups': [u'3619ff8e-a0d9-4529-9837-c087c723ae40'], u'tenant_id': u'3088e9aba97b4f2ea6050275fc890f5c'}}

 /usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_db.py in port_create(self=<vnc_openstack.neutron_plugin_db.DBInterface object>, port_q={u'admin_state_up': True, u'binding:host_id': u'nodeh5', u'device_id': u'b44a8d2d-510e-49c5-96db-3f5eaa81b0df', u'device_owner': u'compute:None', u'extra_dhcp_opts': None, u'name': u'', u'network_id': u'e376dbda-8ce7-40c8-983b-03beec6ae131', u'security_groups': [u'3619ff8e-a0d9-4529-9837-c087c723ae40'], u'tenant_id': u'3088e9aba97b4f2ea6050275fc890f5c'})
 3355
 3356 # create the object
 3357 port_id = self._resource_create('virtual_machine_interface', port_obj)
 3358
 3359 # initialize ip object
port_id undefined
self = <vnc_openstack.neutron_plugin_db.DBInterface object>
self._resource_create = <bound method DBInterface._resource_create of <vnc_openstack.neutron_plugin_db.DBInterface object>>
port_obj = <vnc_api.gen.resource_client.VirtualMachineInterface object>

 /usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_db.py in _resource_create(self=<vnc_openstack.neutron_plugin_db.DBInterface object>, resource_type='virtual_machine_interface', obj=<vnc_api.gen.resource_client.VirtualMachineInterface object>)
  534 def _resource_create(self, resource_type, obj):
  535 try:
  536 obj_uuid = getattr(self._vnc_lib, resource_type + '_create')(obj)
  537 except RefsExistError:
  538 obj.uuid = str(uuid.uuid4())obj_uuid undefined
builtingetattr = <built-in function getattr>
self = <vnc_openstack.neutron_plugin_db.DBInterface object>
self._vnc_lib = <vnc_api.vnc_api.VncApi object>
resource_type = 'virtual_machine_interface'
obj = <vnc_api.gen.resource_client.VirtualMachineInterface object>

 /usr/lib/python2.7/dist-packages/vnc_api/gen/vnc_api_client_gen.py in virtual_machine_interface_create(self=<vnc_api.vnc_api.VncApi object>, obj=<vnc_api.gen.resource_client.VirtualMachineInterface object>)
 5442 content = self._request_server(rest.OP_POST,
 5443 vnc_api.gen.resource_client.VirtualMachineInterface.create_uri,
 5444 data = json_body)
 5445
 5446 virtual_machine_interface_dict = json.loads(content)['virtual-machine-interface']
data undefined
json_body = '{"virtual-machine-interface":{"fq_name": ["defau...uuid": "b44a8d2d-510e-49c5-96db-3f5eaa81b0df"}]}}'

 /usr/lib/python2.7/dist-packages/vnc_api/vnc_api.py in _request_server(self=<vnc_api.vnc_api.VncApi object>, op=1, url=u'/virtual-machine-interfaces', data='{"virtual-machine-interface":{"fq_name": ["defau...uuid": "b44a8d2d-510e-49c5-96db-3f5eaa81b0df"}]}}', retry_on_error=True, retry_after_authn=False)
  346 % (op, url, data, content))
  347 elif status == 403:
  348 raise PermissionDenied(content)
  349 elif status == 409:
  350 raise RefsExistError(content)
global PermissionDenied = <class 'cfgm_common.exceptions.PermissionDenied'>
content = u"[u'default-domain', u'public', u'6668e474-efbc... exceeded for resource virtual-machine-interface"
<class 'cfgm_common.exceptions.PermissionDenied'>: [u'default-domain', u'public', u'6668e474-efbc-4e73-858f-d6dee2225ef1'] : quota limit (1) exceeded for resource virtual-machine-interface
    __class__ = <class 'cfgm_common.exceptions.PermissionDenied'>
    __delattr__ = <method-wrapper '__delattr__' of PermissionDenied object>
    __dict__ = {}
    __doc__ = None
    __format__ = <built-in method __format__ of PermissionDenied object>
    __getattribute__ = <method-wrapper '__getattribute__' of PermissionDenied object>
    __getitem__ = <method-wrapper '__getitem__' of PermissionDenied object>
    __getslice__ = <method-wrapper '__getslice__' of PermissionDenied object>
    __hash__ = <method-wrapper '__hash__' of PermissionDenied object>
    __init__ = <method-wrapper '__init__' of PermissionDenied object>
    __module__ = 'cfgm_common.exceptions'
    __new__ = <built-in method __new__ of type object>
    __reduce__ = <built-in method __reduce__ of PermissionDenied object>
    __reduce_ex__ = <built-in method __reduce_ex__ of PermissionDenied object>
    __repr__ = <method-wrapper '__repr__' of PermissionDenied object>
    __setattr__ = <method-wrapper '__setattr__' of PermissionDenied object>
    __setstate__ = <built-in method __setstate__ of PermissionDenied object>
    __sizeof__ = <built-in method __sizeof__ of PermissionDenied object>
    __str__ = <method-wrapper '__str__' of PermissionDenied object>
    __subclasshook__ = <built-in method __subclasshook__ of type object>
    __unicode__ = <built-in method __unicode__ of PermissionDenied object>
    __weakref__ = None
    args = (u"[u'default-domain', u'public', u'6668e474-efbc... exceeded for resource virtual-machine-interface",)
    message = u"[u'default-domain', u'public', u'6668e474-efbc... exceeded for resource virtual-machine-interface"

The above is a description of an error in a Python program. Here is
the original traceback:

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_interface.py", line 390, in plugin_create_port
    net_info = cfgdb.port_create(port['resource'])
  File "/usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_db.py", line 3357, in port_create
    port_id = self._resource_create('virtual_machine_interface', port_obj)
  File "/usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_db.py", line 536, in _resource_create
    obj_uuid = getattr(self._vnc_lib, resource_type + '_create')(obj)
  File "/usr/lib/python2.7/dist-packages/vnc_api/gen/vnc_api_client_gen.py", line 5444, in virtual_machine_interface_create
    data = json_body)
  File "/usr/lib/python2.7/dist-packages/vnc_api/vnc_api.py", line 348, in _request_server
    raise PermissionDenied(content)
PermissionDenied: [u'default-domain', u'public', u'6668e474-efbc-4e73-858f-d6dee2225ef1'] : quota limit (1) exceeded for resource virtual-machine-interface

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bottle.py", line 764, in _handle
    return route.call(**args)
  File "/usr/lib/python2.7/dist-packages/bottle.py", line 1575, in wrapper
    rv = callback(*a, **ka)
  File "/usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_interface.py", line 465, in plugin_http_post_port
    return self.plugin_create_port(context, port)
  File "/usr/lib/python2.7/dist-packages/vnc_openstack/neutron_plugin_interface.py", line 394, in plugin_create_port
    raise e
PermissionDenied: [u'default-domain', u'public', u'6668e474-efbc-4e73-858f-d6dee2225ef1'] : quota limit (1) exceeded for resource virtual-machine-interface
10.204.217.69 - - [2014-08-10 05:09:11] "POST /neutron/port HTTP/1.1" 500 156 0.095246
------------------------

2014-08-10 05:09:11.357 ERROR [neutron.api.v2.resource] create failed
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/neutron/api/v2/resource.py", line 84, in resource
    result = method(request=request, **args)
  File "/usr/lib/python2.7/dist-packages/neutron/api/v2/base.py", line 405, in create
    obj = obj_creator(request.context, **kwargs)
  File "/usr/lib/python2.7/dist-packages/neutron_plugin_contrail/plugins/opencontrail/contrail_plugin_core.py", line 486, in create_port
    port = self._create_resource('port', context, port)
  File "/usr/lib/python2.7/dist-packages/neutron_plugin_contrail/plugins/opencontrail/contrail_plugin_core.py", line 273, in _create_resource
    obj_name=res_type)
  File "/usr/lib/python2.7/dist-packages/neutron_plugin_contrail/plugins/opencontrail/contrail_plugin_core.py", line 249, in _transform_response
    self._raise_contrail_error(status_code, info, obj_name)
  File "/usr/lib/python2.7/dist-packages/neutron_plugin_contrail/plugins/opencontrail/contrail_plugin_core.py", line 255, in _raise_contrail_error
    error_class = CONTRAIL_EXCEPTION_MAP[status_code]
KeyError: 500