Comment 3 for bug 1562887

oh, I see, this trace
http://paste.openstack.org/show/491423/
is not related to https://bugs.launchpad.net/neutron/+bug/1533440 and l3-ha.
I encountered this exception in rally test every time.
This is a Rally bug I think, because you have no way to set the test network's subnet range.
This line cause the bug:
https://github.com/openstack/rally/blob/master/rally/plugins/openstack/scenarios/neutron/utils.py#L141