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[Launchpad Bug Tracker <1955578@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package neutron - 2:16.4.2-0ubuntu6.4

---------------
neutron (2:16.4.2-0ubuntu6.4) focal; urgency=medium

  [ Corey Bryant ]
  * d/p/ovn-db-sync-continue-on-duplicate-normalise.patch: Cherry-picked
    from upstream to allow ovn_db_sync to continue on duplicate normalised
    CIDR (LP: #1961112).
  * d/p/ovn-db-sync-check-for-router-port-differences.patch:
    Cherry-picked from upstream to ensure router ports are marked
    for needing updates only if they have changed (LP: #2030773).
  * d/p/ovn-specify-port-type-if-router-port-when-updating.patch:
    Specify port type if it's a router port when updating to avoid
    port flapping (LP: #1955578).
  * d/p/fix-acl-sync-when-default-sg-group-created.patch:
    Cherry-picked form upstream to fix ACL sync when default security
    group is created (LP: #2008943).

  [ Mustafa Kemal GILOR ]
  * d/p/add_uplink_status_propagation.patch: Add the
    'uplink-status-propagation' extension to ML2/OVN (LP: #2032770).

 -- Corey Bryant <corey.bryant@xxxxxxxxxxxxx>  Wed, 08 Nov 2023 11:41:21
-0500

** Changed in: neutron (Ubuntu Focal)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1955578

Title:
  OVN transaction could not be completed due to a race condition

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive ussuri series:
  Fix Released
Status in Ubuntu Cloud Archive victoria series:
  Triaged
Status in neutron:
  Fix Released
Status in neutron package in Ubuntu:
  Fix Released
Status in neutron source package in Focal:
  Fix Released

Bug description:
  When executing the test "test_connectivity_through_2_routers" it is highly possible to have
  a race condition:

  networking_ovn.common.exceptions.RevisionConflict: OVN revision number
  for {PORT_ID} (type: ports) is equal or higher than the given
  resource. Skipping update.

  Bugzilla reference:
  https://bugzilla.redhat.com/show_bug.cgi?id=1860448

  ===== Ubuntu SRU Details =====
  [Impact]
  See bug description.

  [Test Case]
  Deploy openstack with OVN. Run the test_connectivity_through_2_routers test from https://github.com/openstack/neutron-tempest-plugin. This could also be tested manually based on what that test does. Ensure the router port status is not set to DOWN at any point.

  [Where problems could occur]
  The existing bug could still occur if the assumpion that specifying the port type is not correct. Presumably this is not the case, but that is a theoritical potential for where problems could occur. All of these patches have already landed in the corresponding upstream branches.

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