[Bug 1931244] Please test proposed package

[Brian Murray]

Hello Edward, or anyone else affected,

Accepted neutron into hirsute-proposed. The package will build now and
be available at
https://launchpad.net/ubuntu/+source/neutron/2:18.0.0-0ubuntu2.1 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
hirsute to verification-done-hirsute. If it does not fix the bug for
you, please add a comment stating that, and change the tag to
verification-failed-hirsute. In either case, without details of your
testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

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https://bugs.launchpad.net/bugs/1931244

Title:
  ovn sriov broken from ussuri onwards

Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive ussuri series:
  Triaged
Status in Ubuntu Cloud Archive victoria series:
  Invalid
Status in Ubuntu Cloud Archive wallaby series:
  Triaged
Status in Ubuntu Cloud Archive xena series:
  Triaged
Status in neutron:
  New
Status in neutron package in Ubuntu:
  Triaged
Status in neutron source package in Focal:
  Fix Committed
Status in neutron source package in Groovy:
  Invalid
Status in neutron source package in Hirsute:
  Fix Committed
Status in neutron source package in Impish:
  Triaged

Bug description:
  I have an Openstack Ussuri 16.3.2 deployment using OVN. When I create
  a vm with one or more sriov ports it fails with:

  2021-06-08 11:38:31.939 526862 WARNING nova.virt.libvirt.driver [req-
  c4be797e-7d7e-4e73-8406-f74ae51db192 696c98b722a44d229e16b6d6474a27d4
  0b9102977dcc4d4ab662b48494bb3110 - 2e0bf6ec95c047d986a61f7570222149
  2e0bf6ec95c047d986a61f7570222149] [instance: 7ab9b374-51eb-
  4e94-8055-c69e8a7d76b3] Timeout waiting for [('network-vif-plugged',
  'c2b7c68d-c465-4ca2-869a-59bc73b2b595'), ('network-vif-plugged',
  'a50de16a-29ac-4dca-9cb6-0247a932fbf3')] for instance with vm_state
  building and task_state spawning.: eventlet.timeout.Timeout: 300
  seconds

  A bit of analysis shows that nova-compute did its thing and sits there
  waiting on network-vif-plugged. The sriov-agent then notices new VFs
  configured and sends a get_devices_details_list() rpc call to neutron
  and neutron never responds. Reverting to 16.3.1 fixes the issue.
  Taking a closer look at 16.3.2 by reverting patches lead to [1] as the
  culprit.

  [1]
  https://github.com/openstack/neutron/commit/7cf9597570f288d27768dc5ff7be04824d09f8bc

  === Ubuntu SRU details ===
  [Impact]
  [Test Case]
  See above.
  I think for testing we can run standard regression testing with OVN/neutron deployments plus tempest testing.

  For now we are planning to revert the commit as a stop-gap to prevent
  further upgrades from being regressed.

  [Regression Potential]
  There is regression potential in that the patch being reverted contributes partial fixes to the following related bugs. Considering most openstack users are on ussuri at this point and 16.3.2 has not been available for very long the revert that we are proposing would seem to have the least amount of regression potential.
  https://bugs.launchpad.net/neutron/+bug/1894117
  https://bugs.launchpad.net/neutron/+bug/1903008

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