Comment 1 for bug 1680912

http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Read%20timed%20out.%20(read%20timeout%3D60)%5C%22

^ suggests there were 3 failures of gate-grenade-dsvm-neutron-ubuntu-xenial in last week overall, though there are more timeouts in other jobs.