[FT] Random errors in ``TestPluginWorker.test_start`` and ``test_restart_rpc_on_sighup_multiple_workers``

[Rodolfo Alonso]

Tests affected:
* neutron.tests.functional.test_server.TestPluginWorker.test_start
* neutron.tests.functional.test_server.TestRPCServer.test_restart_rpc_on_sighup_multiple_workers

Error snippets:
* https://paste.opendev.org/show/bnVMA9BtT5XV1k3UuNS1/
* https://paste.opendev.org/show/bVpMMiPRk54V4YYiFRYX/

Logs:
* https://050c14ff950a28fb762b-6e86dc8a2337ee139316a184fc899cae.ssl.cf1.rackcdn.com/938541/6/check/neutron-functional/ae0078c/testr_results.html
* https://cad760a662fdb6a758d7-0ac025c4ad05a16714f4be3ae2fd18a9.ssl.cf5.rackcdn.com/periodic/opendev.org/openstack/neutron/master/neutron-functional-with-oslo-master/b118bdd/testr_results.html
* https://56cd608d27a94c052f53-f271ccb85dad0b3cb58d1777a51a18d8.ssl.cf5.rackcdn.com/942718/1/check/neutron-functional-with-oslo-master-8/f7147f5/testr_results.html

It could be caused by oslo.service 4.1.0

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/942798

[Rodolfo Alonso (rodolfo-alonso-hernandez)]

I think this issue could be caused because of a problem introduced in [1]. When testing with the previous patch, the problem cannot be reproduced.

When executing any of the two reported tests, the following error is thrown: https://paste.opendev.org/show/bidlcR3URwru2hoswJ6L/. I'm still investigating but I don't correlate the error in the config options and the ``oslo.service`` patch.

Until this error is fixed, I'm going to propose to mark these 2 tests an unstable.

[1]https://review.opendev.org/c/openstack/oslo.service/+/937010

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/942883

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/942883
Committed: https://opendev.org/openstack/neutron/commit/ec257eb74a64e3782c052f975942e17ba085eeb3
Submitter: "Zuul (22348)"
Branch: master

commit ec257eb74a64e3782c052f975942e17ba085eeb3
Author: Rodolfo Alonso Hernandez <email address hidden>
Date: Thu Feb 27 09:01:19 2025 +0000

    [FT] Mark some ``TestNeutronServer`` tests as unstable

    This patch marks the following tests as unstable:
    * TestPluginWorker.test_start
    * TestRPCServer.test_restart_rpc_on_sighup_multiple_workers

    Related-Bug: #2100001
    Change-Id: I514e708d302af4a0370d5d5608d56f603c865b6f

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/942798
Committed: https://opendev.org/openstack/neutron/commit/c33b6f853456e4c8a4ef62edcaf10c65d4db95b1
Submitter: "Zuul (22348)"
Branch: master

commit c33b6f853456e4c8a4ef62edcaf10c65d4db95b1
Author: Rodolfo Alonso Hernandez <email address hidden>
Date: Wed Feb 26 13:48:30 2025 +0000

    [FT] Refactor the ``TestNeutronServer._check_active`` method.

    The method ``TestNeutronServer._check_active`` now actively checks
    if the workers are ready after spawning them. The method ``_fake_start``
    writes a dummy value in a specific queue that is read by the mentioned
    method. If the number of values equals the number of workers, then
    is assumed that all workers are ready.

    Closes-Bug: #2100001
    Change-Id: I4f700db665784144d0e1ded1912a03ea49498ae4

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/oslo.config 9.8.0 Flamingo release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 27.0.0.0b1 Flamingo development milestone.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/oslo.config 9.4.1 Caracal release.