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[Corey Bryant <1927868@xxxxxxxxxxxxxxxxxx>]

** Also affects: neutron (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: neutron (Ubuntu Impish)
   Importance: Critical
       Status: Triaged

** Also affects: neutron (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: neutron (Ubuntu Focal)
       Status: New => Triaged

** Changed in: neutron (Ubuntu Hirsute)
   Importance: Undecided => Critical

** Changed in: neutron (Ubuntu Focal)
   Importance: Undecided => Critical

** Changed in: neutron (Ubuntu Hirsute)
       Status: New => Triaged

** Also affects: cloud-archive
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/wallaby
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/victoria
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/train
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/ussuri
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/xena
   Importance: Undecided
       Status: New

** Changed in: cloud-archive/xena
   Importance: Undecided => Critical

** Changed in: cloud-archive/xena
       Status: New => Triaged

** Changed in: cloud-archive/wallaby
   Importance: Undecided => Critical

** Changed in: cloud-archive/wallaby
       Status: New => Triaged

** Changed in: cloud-archive/victoria
   Importance: Undecided => Critical

** Changed in: cloud-archive/victoria
       Status: New => Triaged

** Changed in: cloud-archive/ussuri
   Importance: Undecided => Critical

** Changed in: cloud-archive/ussuri
       Status: New => Triaged

** Changed in: cloud-archive/train
   Importance: Undecided => Critical

** Changed in: cloud-archive/train
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1927868

Title:
  vRouter not working after update to 16.3.1

Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive train series:
  Triaged
Status in Ubuntu Cloud Archive ussuri series:
  Triaged
Status in Ubuntu Cloud Archive victoria series:
  Triaged
Status in Ubuntu Cloud Archive wallaby series:
  Triaged
Status in Ubuntu Cloud Archive xena series:
  Triaged
Status in neutron:
  New
Status in neutron package in Ubuntu:
  Triaged
Status in neutron source package in Focal:
  Triaged
Status in neutron source package in Hirsute:
  Triaged
Status in neutron source package in Impish:
  Triaged

Bug description:
  We run a juju managed Openstack Ussuri on Bionic. After updating
  neutron packages from 16.3.0 to 16.3.1 all virtual routers stopped
  working. It seems that most (not all) namespaces are created but have
  only the lo interface and sometime the ha-XYZ interface in DOWN state.
  The underlying tap interfaces are also in down.

  neutron-l3-agent has many logs similar to the following:
  2021-05-08 15:01:45.286 39411 ERROR neutron.agent.l3.ha_router [-] Gateway interface for router 02945b59-639b-41be-8237-3b7933b4e32d was not set up; router will not work properly

  and journal logs report at around the same time
  May 08 15:01:40 lar1615.srv-louros.grnet.gr neutron-keepalived-state-change[18596]: 2021-05-08 15:01:40.765 18596 INFO neutron.agent.linux.ip_lib [-] Failed sending gratuitous ARP to 62.62.62.62 on qg-5a6efe8c-6b in namespace qrouter-02945b59-639b-41be-8237-3b7933b4e32d: Exit code: 2; Stdin: ; Stdout: Interface "qg-5a6efe8c-6b" is down
  May 08 15:01:40 lar1615.srv-louros.grnet.gr neutron-keepalived-state-change[18596]: 2021-05-08 15:01:40.767 18596 INFO neutron.agent.linux.ip_lib [-] Interface qg-5a6efe8c-6b or address 62.62.62.62 in namespace qrouter-02945b59-639b-41be-8237-3b7933b4e32d was deleted concurrently

  
  The neutron packages installed are:

  ii  neutron-common                         2:16.3.1-0ubuntu1~cloud0                                    all          Neutron is a virtual network service for Openstack - common
  ii  neutron-dhcp-agent                     2:16.3.1-0ubuntu1~cloud0                                    all          Neutron is a virtual network service for Openstack - DHCP agent
  ii  neutron-l3-agent                       2:16.3.1-0ubuntu1~cloud0                                    all          Neutron is a virtual network service for Openstack - l3 agent
  ii  neutron-metadata-agent                 2:16.3.1-0ubuntu1~cloud0                                    all          Neutron is a virtual network service for Openstack - metadata agent
  ii  neutron-metering-agent                 2:16.3.1-0ubuntu1~cloud0                                    all          Neutron is a virtual network service for Openstack - metering agent
  ii  neutron-openvswitch-agent              2:16.3.1-0ubuntu1~cloud0                                    all          Neutron is a virtual network service for Openstack - Open vSwitch plugin agent
  ii  python3-neutron                        2:16.3.1-0ubuntu1~cloud0                                    all          Neutron is a virtual network service for Openstack - Python library
  ii  python3-neutron-lib                    2.3.0-0ubuntu1~cloud0                                       all          Neutron shared routines and utilities - Python 3.x
  ii  python3-neutronclient                  1:7.1.1-0ubuntu1~cloud0                                     all          client API library for Neutron - Python 3.x


  Downgrading to 16.3.0 resolves the issues.

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