Hi, I've added upstream neutron to this bug to see if anyone is familiar
with it.

** Also affects: neutron
   Importance: Undecided
       Status: New

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

Title:
  vRouter not working after update to 16.3.1

Status in neutron:
  New
Status in neutron package in Ubuntu:
  Confirmed

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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