Comment 6 for bug 1606546

node-2/var/log/nova/nova-compute.log
Nova tries to create port by command:

sudo nova-rootwrap /etc/nova/rootwrap.conf ovs-vsctl --timeout=120 -- --if-exists del-port qvo8e5a0737-a6 -- add-port br-int qvo8e5a0737-a6 -- set Interface qvo8e5a0737-a6 external-ids:iface-id=8e5a0737-a6d3-4d70-83c5-af9fb69e420d external-ids:iface-status=active external-ids:attached-mac=fa:16:3e:19:4e:93 external-ids:vm-uuid=2bed27c1-70b6-4db7-b03a-fbcf34d51215

but OVS command failed by timeout after 2 minutes:
nailgun.test.domain.local/var/log/remote/node-2.test.domain.local/ovs-vsctl.log

2016-08-01T08:32:55.158210+00:00 notice: ovs|00001|vsctl|INFO|Called as /usr/bin/ovs-vsctl --timeout=120 -- --if-exists del-port qvo28267e0a-5d -- add-port br-int qvo28267e0a-5d -- set Interface qvo28267e0a-5d external-ids:iface-id=28267e0a-5d1c-4795-aa03-461c3f93b319 external-ids:iface-status=active external-ids:attached-mac=fa:16:3e:87:1e:a4 external-ids:vm-uuid=0208dfc4-6a9b-4f55-9650-83d625a9222b

2016-08-01T08:34:55.160326+00:00 warning:
ovs|00002|fatal_signal|WARN|terminating with signal 14 (Alarm clock)

It's NOT a timeout of waiting event from neutron. It's a timeout of execution of ovs-vsctl command.