[Bug 1955578] Re: OVN transaction could not be completed due to a race condition

[Brian Haley]

I have tested neutron version 2:16.4.2-0ubuntu6.4~cloud0 from the cloud-
archive:ussuri-proposed repository and can verify the code has this
change, and the failure does not occur. I followed the steps from
Comment #3:

openstack network create test_ap1_net
openstack network create test_ap2_net
openstack network create test_wan_net

openstack subnet create test_ap1_subnet --subnet-range 192.168.210.0/24 --gateway 192.168.210.254 --network test_ap1_net
openstack subnet create test_ap2_subnet --subnet-range 192.168.220.0/24 --gateway 192.168.220.254 --network test_ap2_net

openstack router create test_ap1_rt

openstack router create test_ap2_rt

# Don't know how to wait for router HA being active so... sleep 5 :)

sleep 5

openstack port create test_ap1_internal_port --network test_ap1_net
openstack port create test_ap2_internal_port --network test_ap2_net
openstack port create test_ap1_wan_port --network nova
openstack port create test_ap2_wan_port --network nova

# Here the error can happen
openstack router add port test_ap1_rt test_ap1_wan_port

I did not see any tracebacks in neutron-server.log regarding the OVN
revision number for the port.

** Tags removed: verification-ussuri-needed
** Tags added: verification-ussuri-done

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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 Committed
Status in Ubuntu Cloud Archive victoria series:
  Fix Released
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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