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[Brian Haley <2049546@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 2038541 ***
    https://bugs.launchpad.net/bugs/2038541

This was fixed with
https://review.opendev.org/c/openstack/neutron/+/898832 and is a
duplicate of https://bugs.launchpad.net/neutron/+bug/2038541 - please
try the fix there.

** This bug has been marked a duplicate of bug 2038541
   LinuxBridgeARPSpoofTestCase functional tests fails with latest jammy kernel 5.15.0-86.96

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https://bugs.launchpad.net/bugs/2049546

Title:
  neutron-linuxbridge-agent ebtables RULE_DELETE failed (Invalid
  argument)

Status in neutron:
  New

Bug description:
  neutron-linuxbridge-agent fails and gets stuck when cleaning up ARP
  protection rules:

       neutron-linuxbridge-agent[3049824]: Exit code: 4; Cmd:
  ['ebtables', '-t', 'nat', '--concurrent', '-D', 'neutronMAC-
  tap50f1af99-28', '-i', 'tap50f1af99-28', '--among-src',
  'fa:16:3e:ba:10:2a', '-j', 'RETURN']; Stdin: ; Stdout: ; Stderr:
  ebtables v1.8.7 (nf_tables):  RULE_DELETE failed (Invalid argument):
  rule in chain neutronMAC-tap50f1af99-28

  Afterward, it stops responding to RPC messages and nova-compute times
  out waiting for vif-plugged events.

  Version:

    * OpenStack Zed from Ubuntu cloud archive
    * Ubuntu 22.04 LTS
    * 5.15.0-91-generic #101-Ubuntu
    * Deployed via Ubuntu cloud archive packages

  Context:

  The document
  https://github.com/openstack/neutron/blob/stable/zed/doc/source/admin/deploy-
  lb.rst mentions some resolved issues with ebtables based on nftables,
  and the scenarios from the linked bug reports do work. The issue here
  appears to only happens when removing ARP spoofing rules. We have a
  few compute hosts with a high churn, many instances created and
  deleted. On these, neutron-linuxbridge-agent works visibly fine until
  it becomes too stuck.

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