Comment 3 for bug 1951493

* Can this problem reproducible? If yes, what are the reproducing steps?

It can be reproduced very easily as long as you use OVS DPDK and DVR mode. you can reproduce it after qrouter, dhcp, snat or fip namespaces are added and OVS DPDK is restarted.

* Which version of neutron you are using?

Victoria, this is an OVS-DPDK-specific issue.

* How did you configure neutron? (better to attach the config file)

in DVR use case.

* How did you install neutron (kolla-ansible? devstack? or others?)

devstack, openstack-helm

* The logs of all neutron processes.

bug statement has explained it very clearly. When OVS DPDK is restared, OVS DPDK doesn't know network namespaces of qr-XXXX, fg-XXXX, tap-XXXX, qg-XXXX, sg-XXXX, so OVS DPDK will recreate them in root namespace, OVS DPDK will use these newly-created ports, but neutron is using the old ones in namespaces, this is the issue/bug I'm saying.