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[Ihar Hrachyshka <1580899@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1523859 ***
    https://bugs.launchpad.net/bugs/1523859

** This bug has been marked a duplicate of bug 1523859
   Failing router interface add changes port device_id/device_owner attributes

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https://bugs.launchpad.net/bugs/1580899

Title:
  Overlapped new router interface cannot remove

Status in neutron:
  Fix Released

Bug description:
  To reproduce the bug:
  1. Create a router (could be any type: legacy, HA, DVR, DVR + HA)
  2. Create network1 with subnet1 192.168.111.0/24 gateway 192.168.111.1
  3. Create network2 with subnet2 192.168.111.0/24 gateway 192.168.111.254
  4. Create router interface to subnet1 by using subnet1's subnet_id
  5. Create a port1 with IP 192.168.111.254 in subnet2
  6. Create router interface to subnet2 by using port1's port_id

  Then you will get some API exception like:
  Bad router request: Cidr 192.168.111.0/24 of subnet 4c230a4b-7d34-4e11-9351-4fa720c94004
  overlaps with cidr 192.168.111.0/24 of subnet ba280c8a-c761-407d-bcfe-741dae8a37d3.
  Neutron server returns request_ids: ['req-d6488a58-44a8-40c8-8e9e-fad94e43bafd']

  And finally the port1 will never be able to delete.
  Exception trace:
  2016-05-12 15:13:49.847 20792 ERROR neutron.callbacks.manager [req-5274c5a0-790d-463f-a6cd-8334b9944a60 3024b3c2f2da48fbbf426084b0706f84 5ff1da9c235c4ebcaefeecf3fff7eb11 - - -] Error during notification for neutron.db.l3_db._prevent_l3_port_delete_callback port, before_delete
  2016-05-12 15:13:49.847 20792 ERROR neutron.callbacks.manager Traceback (most recent call last):
  2016-05-12 15:13:49.847 20792 ERROR neutron.callbacks.manager   File "/usr/lib/python2.7/site-packages/neutron/callbacks/manager.py", line 146, in _notify_loop
  2016-05-12 15:13:49.847 20792 ERROR neutron.callbacks.manager     callback(resource, event, trigger, **kwargs)
  2016-05-12 15:13:49.847 20792 ERROR neutron.callbacks.manager   File "/usr/lib/python2.7/site-packages/neutron/db/l3_db.py", line 1851, in _prevent_l3_port_delete_callback
  2016-05-12 15:13:49.847 20792 ERROR neutron.callbacks.manager     l3plugin.prevent_l3_port_deletion(context, port_id)
  2016-05-12 15:13:49.847 20792 ERROR neutron.callbacks.manager   File "/usr/lib/python2.7/site-packages/neutron/db/l3_db.py", line 1451, in prevent_l3_port_deletion
  2016-05-12 15:13:49.847 20792 ERROR neutron.callbacks.manager     reason=reason)
  2016-05-12 15:13:49.847 20792 ERROR neutron.callbacks.manager ServicePortInUse: Port cbccd81c-d8c0-4dfd-bff3-24c4edeb6825 cannot be deleted directly via the port API: has device owner network:router_interface.
  2016-05-12 15:13:49.847 20792 ERROR neutron.callbacks.manager
  2016-05-12 15:13:49.849 20792 INFO neutron.api.v2.resource [req-5274c5a0-790d-463f-a6cd-8334b9944a60 3024b3c2f2da48fbbf426084b0706f84 5ff1da9c235c4ebcaefeecf3fff7eb11 - - -] delete failed (client error): Port cbccd81c-d8c0-4dfd-bff3-24c4edeb6825 cannot be deleted directly via the port API: has device owner network:router_interface.

  
  And the this port will also can not remove by router_interface_remove:

  2016-05-12 16:20:28.535 21756 INFO neutron.api.v2.resource [req-3ba33215-e09e-423d-a7aa-07cdd66fea61 3024b3c2f2da48fbbf426084b0706f84 5ff1da9c235c4ebcaefeecf3fff7eb11 - - -] remove_router_interface failed (client error): Router 3895a472-a64c-424e-b0c9-0f610db88f67 does not have an interface with id 1760df10-f5f0-4182-a0cc-a144d5aa46c5
  2016-05-12 16:20:28.536 21756 INFO neutron.wsgi [req-3ba33215-e09e-423d-a7aa-07cdd66fea61 3024b3c2f2da48fbbf426084b0706f84 5ff1da9c235c4ebcaefeecf3fff7eb11 - - -] 172.16.5.10 - - [12/May/2016 16:20:28] "PUT /v2.0/routers/3895a472-a64c-424e-b0c9-0f610db88f67/remove_router_interface.json HTTP/1.1" 404 418 0.173747

  
  This patch introduces this new bug:
  https://bugs.launchpad.net/neutron/+bug/1475093
  https://review.openstack.org/#/c/202357/

  Some bugs maybe related:
  https://bugs.launchpad.net/bgpvpn/+bug/1537067
  https://bugs.launchpad.net/neutron/+bug/1537091

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