I noticed the following issues happening quite often now in the opportunistic db tests for nova - http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22sqlalchemy.exc.ResourceClosedError%5C%22 It looks like some race has been introduced where the various db connections are not fully isolated from each other like they used to be. The testing magic for this is buried pretty deep in oslo.db. Olso.db 4.13.3 did hit the scene about the time this showed up. So I think we need to strongly consider blocking it and revisiting these issues post newton. -Sean -- Sean Dague http://dague.net