I did some analysis of that issue and it seems that it may be another "variant" of the old bug https://bugs.launchpad.net/neutron/+bug/1618987 as, according to the ovs logs port is added, then deleted and added again quickly:
2022-02-21T12:25:56.484Z|04524|bridge|INFO|bridge test-br0e5eb98d: added interface qg-d9d41d8e-8b on port 7
...
2022-02-21T12:25:56.707Z|04530|bridge|INFO|bridge test-br0e5eb98d: deleted interface qg-d9d41d8e-8b on port 7
...
2022-02-21T12:25:56.713Z|04532|bridge|INFO|bridge test-br0e5eb98d: added interface qg-d9d41d8e-8b on port 7
All of that within about 250 ms. And during that time test failed actually.
I did some analysis of that issue and it seems that it may be another "variant" of the old bug https:/ /bugs.launchpad .net/neutron/ +bug/1618987 as, according to the ovs logs port is added, then deleted and added again quickly:
2022-02- 21T12:25: 56.484Z| 04524|bridge| INFO|bridge test-br0e5eb98d: added interface qg-d9d41d8e-8b on port 7 21T12:25: 56.707Z| 04530|bridge| INFO|bridge test-br0e5eb98d: deleted interface qg-d9d41d8e-8b on port 7 21T12:25: 56.713Z| 04532|bridge| INFO|bridge test-br0e5eb98d: added interface qg-d9d41d8e-8b on port 7
...
2022-02-
...
2022-02-
All of that within about 250 ms. And during that time test failed actually.