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i have filed a bug for this https://bugs.launchpad.net/os-vif/+bug/1980948 and submited two patches for os-vif and nova
https://review.opendev.org/q/topic:bug%252F1980948
other projects might also be affected by the cahnge intorduced in https://github.com/openstack/neutron/commit/7f0413c84c4515cd2fae31d823613c4d7ea43110

until those are merged please continue to hold of rechecking nova or os-vif ci failures.
On Thu, 2022-07-07 at 12:32 +0100, Sean Mooney wrote:
> hi o/
> 
> it looks like neutron recently moved linuxbridge to be experimental
> Jul 06 16:21:46.640517 ubuntu-focal-rax-ord-0030301377 neutron-server[90491]: ERROR neutron.common.experimental [-] Feature 'linuxbridge' is
> experimental and has to be explicitly enabled in 'cfg.CONF.experimental'
> 
> we do not actully deploy it in nova-next or nova-ovs-hybrid-plug but it is enabeld in our job config as one of the configured mech drivers
> even if we dont install the agent.
> 
> i have not looked up what change in neutron change this yet but im going to propose a patch to nova to disable it and i likely need to fix os-vif too
> so if you see a post fialure in either the nova-next of novs hybrid plug jobs (and or look into it and see " die 2385 'Neutron did not start'" in the
> Run devstack task summery that is why this is failing.
> 
> ill update this thread once we have fixed the issue.
>