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[Anh Tran <anhtt@xxxxxxxxxxxxxx>]

Public bug reported:

>From this patch: https://review.openstack.org/#/c/341427/
Sometimes, port doesn't revert device_owner to previous value in concurrent requests case.

$ neutron port-create --name port1 net1           |   Overlapped CIDR
$ neutron port-create --name port2 net2           |

mysql> select name, device_id, device_owner from ports;
+-------+-------------------------------------------------------------------------------+--------------------------+
| name--| device_id ------------------------------------------------------------------- | device_owner ----------- |
+-------+-------------------------------------------------------------------------------+--------------------------+
| port1 | ----------------------------------------------------------------------------- | ------------------------ |
| port2 | ----------------------------------------------------------------------------- | ------------------------ |
+-------+-------------------------------------------------------------------------------+--------------------------+


$ neutron router-interface-add router-test port=port1 & neutron router-interface-add router-test port=port2

Added interface 68c26144-4ae5-4316-a631-93d5e3a44fd8 to router router-test.
Bad router request: Cidr 192.166.0.0/16 of subnet 87d56713-e6f0-47ee-918d-759cb69b372d overlaps with cidr 192.166.100.0/24 of subnet 94cdfe4c-0e8e-40af-93fe-e8dcc2cb7484.


WE EXPECTED IN DATABASE:
mysql> select name, device_id, device_owner from ports;
+-------+-------------------------------------------------------------------------------+--------------------------+
| name--| device_id-------------------------------------------------------------------- | device_owner ----------- |
+-------+-------------------------------------------------------------------------------+--------------------------+
| port1 | f872184e-031e-43ae-9bc7-e1f05137e09e ---------------------------------------- | network:router_interface |
| port2 | ----------------------------------------------------------------------------- | ------------------------ |
+-------+-------------------------------------------------------------------------------+--------------------------+

BUT, CURRENT RESULT HERE:
mysql> select name, device_id, device_owner from ports;
+-------+-------------------------------------------------------------------------------+--------------------------+
| name--| device_id ------------------------------------------------------------------- | device_owner ----------- |
+-------+-------------------------------------------------------------------------------+--------------------------+
| port1 | f872184e-031e-43ae-9bc7-e1f05137e09e ---------------------------------------- | network:router_interface |
| port2 | ----------------------------------------------------------------------------- | network:router_interface |
+-------+-------------------------------------------------------------------------------+--------------------------+

** Affects: neutron
     Importance: Undecided
     Assignee: Anh Tran (trananhkma)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1621750

Title:
  Port does not revert device_owner to previous value in concurrent
  requests case

Status in neutron:
  In Progress

Bug description:
  From this patch: https://review.openstack.org/#/c/341427/
  Sometimes, port doesn't revert device_owner to previous value in concurrent requests case.

  $ neutron port-create --name port1 net1           |   Overlapped CIDR
  $ neutron port-create --name port2 net2           |

  mysql> select name, device_id, device_owner from ports;
  +-------+-------------------------------------------------------------------------------+--------------------------+
  | name--| device_id ------------------------------------------------------------------- | device_owner ----------- |
  +-------+-------------------------------------------------------------------------------+--------------------------+
  | port1 | ----------------------------------------------------------------------------- | ------------------------ |
  | port2 | ----------------------------------------------------------------------------- | ------------------------ |
  +-------+-------------------------------------------------------------------------------+--------------------------+

  
  $ neutron router-interface-add router-test port=port1 & neutron router-interface-add router-test port=port2

  Added interface 68c26144-4ae5-4316-a631-93d5e3a44fd8 to router router-test.
  Bad router request: Cidr 192.166.0.0/16 of subnet 87d56713-e6f0-47ee-918d-759cb69b372d overlaps with cidr 192.166.100.0/24 of subnet 94cdfe4c-0e8e-40af-93fe-e8dcc2cb7484.

  
  WE EXPECTED IN DATABASE:
  mysql> select name, device_id, device_owner from ports;
  +-------+-------------------------------------------------------------------------------+--------------------------+
  | name--| device_id-------------------------------------------------------------------- | device_owner ----------- |
  +-------+-------------------------------------------------------------------------------+--------------------------+
  | port1 | f872184e-031e-43ae-9bc7-e1f05137e09e ---------------------------------------- | network:router_interface |
  | port2 | ----------------------------------------------------------------------------- | ------------------------ |
  +-------+-------------------------------------------------------------------------------+--------------------------+

  BUT, CURRENT RESULT HERE:
  mysql> select name, device_id, device_owner from ports;
  +-------+-------------------------------------------------------------------------------+--------------------------+
  | name--| device_id ------------------------------------------------------------------- | device_owner ----------- |
  +-------+-------------------------------------------------------------------------------+--------------------------+
  | port1 | f872184e-031e-43ae-9bc7-e1f05137e09e ---------------------------------------- | network:router_interface |
  | port2 | ----------------------------------------------------------------------------- | network:router_interface |
  +-------+-------------------------------------------------------------------------------+--------------------------+

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