Comment 5 for bug 1683982

Hello,

Thanks for enabling this patch in proposed. I have performed a verification
of the fix on Xenial HWE.

With 4.8.0-52 (current linux-generic-hwe-16.04) the error is consistently
reproduced, as can be seen in the following lines:

root@juju-niedbalski-xenial-machine-30:/home/ubuntu# uname -a
Linux juju-niedbalski-xenial-machine-30 4.8.0-52-generic #55~16.04.1-Ubuntu SMP Fri Apr 28 14:36:29 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

root@juju-niedbalski-xenial-machine-30:/home/ubuntu# /usr/bin/dhcp_release ns-8382c038-49 192.168.21.14 FA:16:3E:45:6F:AF

root@juju-niedbalski-xenial-machine-30:/home/ubuntu# more /var/lib/neutron/dhcp/72dd7d69-9107-45a2-bc0f-43dfe06fcbbb/addn_hosts
192.168.21.1 host-192-168-21-1.openstacklocal host-192-168-21-1
192.168.21.2 host-192-168-21-2.openstacklocal host-192-168-21-2
192.168.21.6 host-192-168-21-6.openstacklocal host-192-168-21-6
192.168.21.14 host-192-168-21-14.openstacklocal host-192-168-21-14
192.168.21.7 host-192-168-21-7.openstacklocal host-192-168-21-7

After installing the latest linux-generic-hwe-16.04-edge, the lease is correctly
removed, fixing the reported issue.

root@juju-niedbalski-xenial-machine-30:/home/ubuntu# uname -a
Linux juju-niedbalski-xenial-machine-30 4.10.0-21-generic #23~16.04.1-Ubuntu SMP Tue May 2 12:57:17 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

root@juju-niedbalski-xenial-machine-30:/home/ubuntu# /usr/bin/dhcp_release ns-8382c038-49 192.168.21.6 fa:16:3e:4c:fb:e4
root@juju-niedbalski-xenial-machine-30:/home/ubuntu# more /var/lib/neutron/dhcp/72dd7d69-9107-45a2-bc0f-43dfe06fcbbb/leases
1494092249 fa:16:3e:d0:f7:1b 192.168.21.7 host-192-168-21-7 *
1494092249 fa:16:3e:f8:67:3b 192.168.21.2 host-192-168-21-2 *
1494092249 fa:16:3e:9f:05:3d 192.168.21.1 host-192-168-21-1 *

Marking verification-done-yakkety.