On a VN, just keep creating and deleting the ports.

Logs are at http://10.204.216.50/Docs/bugs/1337803

root@nodec22:~# neutron port-create name-NRBwrc
Created a new port:
+-----------------+-------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------+
| Field           | Value                                                                                                 
                                                                                    |
+-----------------+-------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------+
| admin_state_up  | True                                                                                                  
                                                                                    |
| device_id       |                                                                                                       
                                                                                    |
| device_owner    | TODO-device-owner                                                                                     
                                                                                    |
| fixed_ips       | {"subnet_id": "dbb0a03f-5600-4aa5-bfc9-64323af0b368", "ip_address": "41.78.119.254", "port_id": "37c23add-220a-4c82-a7af-f66138f346c0", "net_id": "cae0da2f-c8cb-44a1-8e00-72fc196e286c"} |
| id              | 37c23add-220a-4c82-a7af-f66138f346c0                                                                                                                                                      |
| mac_address     | 02:37:c2:3a:dd:22                                                                                                                                                                         |
| name            | 37c23add-220a-4c82-a7af-f66138f346c0                                                                                                                                                      |
| network_id      | cae0da2f-c8cb-44a1-8e00-72fc196e286c                                                                                                                                                      |
| security_groups | e8d6bb68-5789-4a3a-8a92-1fbba58c9195                                                          
                                                                                    |
| status          | ACTIVE                                                                                                                                                                                    |
| tenant_id       | ac822370b03c4ed9bc837f391cb0faab                                                                                                                                                          |
+-----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
root@nodec22:~# neutron port-delete 37c23add-220a-4c82-a7af-f66138f346c0
Request Failed: internal server error while processing your request.
root@nodec22:~#