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[Bug 1750563] [NEW] IP address isn't assigned to a subnet gateway interface in some cases.

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Anton Kremenetsky <1750563@xxxxxxxxxxxxxxxxxx>
Date: Tue, 20 Feb 2018 12:38:38 -0000
Reply-to: Bug 1750563 <1750563@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Public bug reported:

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.

** Affects: neutron
Importance: Undecided
Status: New

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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:
New

Bug description:
Hello everyone,

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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