Can't boot instance - VirtualInterfaceCreateException

After stacking with the following local.conf:
-------------
enable_plugin networking-odl https://github.com/openstack/networking-odl.git master
enable_plugin networking-sfc https://github.com/openstack/networking-sfc.git master

ODL_RELEASE=carbon-snapshot-0.6
ODL_NETVIRT_KARAF_FEATURE+=,odl-netvirt-sfc

[[post-config|$NEUTRON_CONF]]
[sfc]
drivers = odl_v2
[flowclassifier]
drivers = odl_v2
-------------

which was successful, and trying to launch an instance with the following commands:
IMAGE_NAME="cirros-0.3.5-x86_64-disk"
PORT1_ID=$(neutron port-create private --name p1 | grep " id " | awk '{print $4}')
nova boot --image $IMAGE_NAME --nic port-id=$PORT1_ID --flavor m1.nano myimg1

After somewhere between 15 and 60 seconds, the spawn failed. There are no explicit errors in neutron-server, but in nova-compute the following can be seen: http://paste.openstack.org/show/614831/

Only about 1 day ago, using https://review.openstack.org/#/c/479588/ as the head, this issue did not occur.