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[Launchpad Bug Tracker <1845364@xxxxxxxxxxxxxxxxxx>]

[Expired for neutron because there has been no activity for 60 days.]

** Changed in: neutron
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1845364

Title:
  [fullstack] Race condition when updating the router port information
  and updating the network MTU

Status in neutron:
  Expired

Bug description:
  In [1] we can see a race condition between the router port processing
  and the network (where this port belongs) update processing in the L3
  agent. Ordered list of events:

  1) In [2] 03:05:13.563: The router starts the updating process.
     Starting router update for bc221d89-8e74-4112-b42a-3c3c0908404e, action 
     3, priority 1, update_id 0ce8cd8d-b393-4a48-8dbf-5e8f537a32ae
  This process is asynchronous.

  2) In [2] 03:05:22.318: BaseRouterInfo.process() starts processing a new network added.
     adding internal network: prefix(qr-), port(
     d15ca83e-d6c7-47c0-ae13-05e074707148)

  3) In [3] 03:05:23.348: The network MTU is updated.
     Request body: {'network': {'mtu': 1499}} prepare_request_body
  This event is received and processed in the L3 agent in L3NATAgent.network_update. But at this point, the router does not have the internal port added in BaseRouterInfo.internal_ports. This is going to happen in 4).

  4) In [2] 03:05:26.671: The port d15ca83e-d6c7-47c0-ae13-05e074707148 is added to BaseRouterInfo.internal_ports
     appending port {'id': 'd15ca83e-d6c7-47c0-ae13-05e074707148', ..., 
     'mtu': 1500} to internal_ports cache

  LOGS:
  [1] https://df0eb3e2e26f1607f7d8-b5f72c94f829be93029a2756be493e29.ssl.cf2.rackcdn.com/679813/2/gate/neutron-fullstack/dfbde3f/testr_results.html.gz
  [2] L3 agent: https://df0eb3e2e26f1607f7d8-b5f72c94f829be93029a2756be493e29.ssl.cf2.rackcdn.com/679813/2/gate/neutron-fullstack/dfbde3f/controller/logs/dsvm-fullstack-logs/TestLegacyL3Agent.test_mtu_update/neutron-l3-agent--2019-09-12--03-04-54-685728_log.txt.gz
  [3] Neutron server: https://df0eb3e2e26f1607f7d8-b5f72c94f829be93029a2756be493e29.ssl.cf2.rackcdn.com/679813/2/gate/neutron-fullstack/dfbde3f/controller/logs/dsvm-fullstack-logs/TestLegacyL3Agent.test_mtu_update/neutron-server--2019-09-12--03-04-44-432445_log.txt.gz

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