Deleting network does not remove network namespace

[Brian Haley]

Environment: ML2/OVS

DevStack Version: 2023.2
Change: b10c06027273d125f2b8cd14d4b19737dfb94b94 Merge "Add config options for cinder nfs backend" 2023-03-27 14:20:04 +0000
OS Version: Ubuntu 22.04 jammy

While testing a fix for a bug on a recent devstack, I noticed that network namespaces were not getting deleted when I deleted a network with a subnet attached to it.

$ openstack network list
+--------------------------------------+----------+----------------------------------------------------------------------------+
| ID | Name | Subnets |
+--------------------------------------+----------+----------------------------------------------------------------------------+
| 32171620-509d-498f-b0e1-b86c2fdc004e | shared | 995701e4-7923-411f-b3d6-a0d9a6c22ca5 |
| 6cc3ff11-09a6-40a8-9765-a453fcb7bf2e | private | d990dbe7-5658-46f7-b0a1-691a18444519, e7c91b4a-0595-42be-b777-6a2ee6d45113 |
| b2fbc798-3163-4696-9a12-75a4f0b7c3c7 | public | 4be007ea-0a2a-48e2-94a2-15407ff11694, af06a026-7044-4284-b653-955c41685905 |
| cc47f423-c50b-4b06-b62b-6d2603eb5fa0 | mtu-1279 | 0664a3d9-3eb8-4503-86dd-aba78c02791c |
+--------------------------------------+----------+----------------------------------------------------------------------------+

$ ip netns | grep cc47f423-c50b-4b06-b62b-6d2603eb5fa0
qdhcp-cc47f423-c50b-4b06-b62b-6d2603eb5fa0 (id: 6)

$ openstack network delete cc47f423-c50b-4b06-b62b-6d2603eb5fa0
$ openstack network list
+--------------------------------------+---------+----------------------------------------------------------------------------+
| ID | Name | Subnets |
+--------------------------------------+---------+----------------------------------------------------------------------------+
| 32171620-509d-498f-b0e1-b86c2fdc004e | shared | 995701e4-7923-411f-b3d6-a0d9a6c22ca5 |
| 6cc3ff11-09a6-40a8-9765-a453fcb7bf2e | private | d990dbe7-5658-46f7-b0a1-691a18444519, e7c91b4a-0595-42be-b777-6a2ee6d45113 |
| b2fbc798-3163-4696-9a12-75a4f0b7c3c7 | public | 4be007ea-0a2a-48e2-94a2-15407ff11694, af06a026-7044-4284-b653-955c41685905 |
+--------------------------------------+---------+----------------------------------------------------------------------------+

$ ip netns | grep cc47f423-c50b-4b06-b62b-6d2603eb5fa0
qdhcp-cc47f423-c50b-4b06-b62b-6d2603eb5fa0 (id: 6)

I almost would have expected an error since there was a subnet here, will have to re-check the API ref to see.

During one attempt I actually triggered a SubnetNotFound error, but that's probably a different issue as it wasn't necessary to recreate this.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/880006

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 23.0.0.0b3 development milestone.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 22.1.0 release.