linuxbridge-agent on centos8 throws Exit code: 255; Stdin: ; Stdout: ; Stderr: Unknown argument: '--among-src'.

[Michal Nasiadka]

Environment:

Kolla-Ansible CI - Linuxbridge job on CentOS 8.

Error:
2020-02-19 13:47:22.344 6 DEBUG neutron.agent.linux.utils [req-d803e1fa-8844-4381-ae67-7c77341ca455 - - - - -] Running command: ['sudo', 'neutron-rootwrap', '/etc/neutron/rootwrap.conf', 'ebtables', '-t', 'nat', '--concurrent', '-L'] create_process /var/lib/kolla/venv/lib/python3.6/site-packages/neutron/agent/linux/utils.py:87
2020-02-19 13:47:22.729 6 DEBUG neutron.agent.linux.utils [req-d803e1fa-8844-4381-ae67-7c77341ca455 - - - - -] Running command: ['sudo', 'neutron-rootwrap', '/etc/neutron/rootwrap.conf', 'ebtables', '-t', 'nat', '--concurrent', '-N', 'neutronMAC-tape1686e7f-a3', '-P', 'DROP'] create_process /var/lib/kolla/venv/lib/python3.6/site-packages/neutron/agent/linux/utils.py:87
2020-02-19 13:47:23.110 6 DEBUG neutron.agent.linux.utils [req-d803e1fa-8844-4381-ae67-7c77341ca455 - - - - -] Running command: ['sudo', 'neutron-rootwrap', '/etc/neutron/rootwrap.conf', 'ebtables', '-t', 'nat', '--concurrent', '-A', 'PREROUTING', '-i', 'tape1686e7f-a3', '-j', 'neutronMAC-tape1686e7f-a3'] create_process /var/lib/kolla/venv/lib/python3.6/site-packages/neutron/agent/linux/utils.py:87
2020-02-19 13:47:23.480 6 DEBUG neutron.agent.linux.utils [req-d803e1fa-8844-4381-ae67-7c77341ca455 - - - - -] Running command: ['sudo', 'neutron-rootwrap', '/etc/neutron/rootwrap.conf', 'ebtables', '-t', 'nat', '--concurrent', '-A', 'neutronMAC-tape1686e7f-a3', '-i', 'tape1686e7f-a3', '--among-src', 'fa:16:3e:f8:5b:f1', '-j', 'RETURN'] create_process /var/lib/kolla/venv/lib/python3.6/site-packages/neutron/agent/linux/utils.py:87
2020-02-19 13:47:23.845 6 ERROR neutron.agent.linux.utils [req-d803e1fa-8844-4381-ae67-7c77341ca455 - - - - -] Exit code: 255; Stdin: ; Stdout: ; Stderr: Unknown argument: '--among-src'.

Logs:
https://zuul.opendev.org/t/openstack/build/106674bc689e49e5b42a9e4429f6ce67/log/primary/logs/kolla/neutron/neutron-linuxbridge-agent.txt

https://zuul.opendev.org/t/openstack/build/106674bc689e49e5b42a9e4429f6ce67/logs

[Radosław Piliszek (yoctozepto)]

Upstream background on ebtables issue: https://bugzilla.redhat.com/show_bug.cgi?id=1720637

[Slawek Kaplonski (slaweq)]

It's known issue in ebtables which are using in Centos 8 (probably as it's for sure RHEL 8 issue). See https://bugzilla.redhat.com/show_bug.cgi?id=1713329 for some details.

[Slawek Kaplonski (slaweq)]

According to https://bugzilla.redhat.com/show_bug.cgi?id=1646779 it seems for me that it should be already fixed in newer version of iptables

[Slawek Kaplonski (slaweq)]

So, based on my comments above I will close this as not a bug in Neutron.

[Michal Nasiadka (mnasiadka)]

Well, I understand it's not a bug in Neutron - but it's latest centos:8 container image - I'll open a bug in CentOS bug tracker...
By the way - it's very fancy to close a bug linking to a non-public bug (which I can't even read what is it all about) ;-)

[Slawek Kaplonski (slaweq)]

@Michal: sorry for this link. I was logged in to bugzilla and I didn't notice that it is private one. My bad :)