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[Brian Haley <1622002@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

If someone enables dhcpv6-stateful addressing on a subnet, but they are
running an old version of dnsmasq (<2.76), then the dhcp agent could try
and run dhcp_release6 even though it isn't present.  An example:

http://logs.openstack.org/53/365653/5/check/gate-tempest-dsvm-neutron-
multinode-full-ubuntu-
xenial/813d16d/logs/screen-q-dhcp.txt.gz#_2016-09-06_11_40_02_272

Checking it's present first would fix this problem.

Since the change to call dhcp_release6 was just added in
https://review.openstack.org/#/c/301747/ we should fix this before
Newton ships and people complain.

There is also an effort to get Cirros to support DHCPv6 so that we can test this in the gate,
https://bugs.launchpad.net/cirros/+bug/1487041 - hopefully that gets done so we can add a functional test.

** Affects: neutron
     Importance: High
     Assignee: Brian Haley (brian-haley)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1622002

Title:
  dhcp_release6 can be called when it is not present

Status in neutron:
  In Progress

Bug description:
  If someone enables dhcpv6-stateful addressing on a subnet, but they
  are running an old version of dnsmasq (<2.76), then the dhcp agent
  could try and run dhcp_release6 even though it isn't present.  An
  example:

  http://logs.openstack.org/53/365653/5/check/gate-tempest-dsvm-neutron-
  multinode-full-ubuntu-
  xenial/813d16d/logs/screen-q-dhcp.txt.gz#_2016-09-06_11_40_02_272

  Checking it's present first would fix this problem.

  Since the change to call dhcp_release6 was just added in
  https://review.openstack.org/#/c/301747/ we should fix this before
  Newton ships and people complain.

  There is also an effort to get Cirros to support DHCPv6 so that we can test this in the gate,
  https://bugs.launchpad.net/cirros/+bug/1487041 - hopefully that gets done so we can add a functional test.

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