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[Brian Haley <1750563@xxxxxxxxxxxxxxxxxx>]

No one was ever able to pick this up, closing as it was filed against
code that is now EOL.

** Changed in: neutron
       Status: Confirmed => Won't Fix

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https://bugs.launchpad.net/bugs/1750563

Title:
  IP address isn't assigned to a subnet gateway interface in some cases.

Status in neutron:
  Won't Fix

Bug description:
  Hello everyone,

  Seems I caught a race condition bug in neutron-l3-agent.
  We have automated tests. One of the test performs the following scenario. Creates different resources such as network, subnet and so on. Then the test connects the subnet to a router and perform other things that are not related to this bug. The test is performed in a cycle with different parameters but we use the same parameters for the Neutron resources. I mean the test always creates subnet with the same CIDR 192.168.0.0/24 and the subnet gateway interface gets 192.168.0.1 IP address. The bug happens in the moment when the subnet is connecting to the router. I would like to note that is not a  permanent bug, sometimes it happens but sometimes not. 
  So bug looks like you don't access to the instances(VMs) using floating IPs. It's not possible to ping them. I did some debug, it turned out the subnet gateway interface didn't get an IP sometimes. For example, when the bug happens the interface looks so

  root@network-N6-rmfqne:/var/log/neutron# sudo /usr/bin/neutron-rootwrap /etc/neutron/rootwrap.conf ip netns exec qrouter-a35f384b-549e-41c6-8076-2283be384e1b ip a
  ...
  389: qr-7dc17e0a-97@if786: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UP group default qlen 1000
      link/ether fa:16:3e:1e:47:78 brd ff:ff:ff:ff:ff:ff link-netnsid 0
      inet6 fe80::f816:3eff:fe1e:4778/64 scope link
         valid_lft forever preferred_lft forever

  
  For a success case it looks so.

  root@network-N6-rmfqne:/var/log/neutron# sudo /usr/bin/neutron-rootwrap /etc/neutron/rootwrap.conf ip netns exec qrouter-a35f384b-549e-41c6-8076-2283be384e1b ip a
  ...
  393: qr-cccf794e-86@if794: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UP group default qlen 1000
      link/ether fa:16:3e:54:0c:11 brd ff:ff:ff:ff:ff:ff link-netnsid 0
      inet 192.168.0.1/24 scope global qr-cccf794e-86
         valid_lft forever preferred_lft forever
      inet6 fe80::f816:3eff:fe54:c11/64 scope link
         valid_lft forever preferred_lft forever

  We are using Juju to deploy OpenStack. The version of the neutron-
  gateway 9.4.1, the version of the charm is 244.

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