Comment 1 for bug 1599057

Ah quite right, in _do_live_migration in /nova/compute/manager.py you see the error handling sets the migration record to the error state, but it has not put the instance into the ERROR state, as it should have. See:
https://github.com/openstack/nova/blob/bd0ba826e4cc764f257d20c748c390caf73aa619/nova/compute/manager.py#L5218