Hi, It is most probably caused by issue [1]. It is another issue exposed, I think by new oslo.privsep version with concurrency. We are currently working to find root cause and fix for this issue. [1] https://bugs.launchpad.net/neutron/+bug/1811515 > Wiadomość napisana przez Ni, Qi <qi.ni at intel.com> w dniu 15.01.2019, o godz. 10:10: > > Hello guys, > > I’ve been working on a patch of neutron https://review.openstack.org/#/c/626109/11 and it keeps failing when building. I’m sure my code is bug free and I found Liu Yulong’s patch has a similar condition like mine. https://review.openstack.org/#/c/627285/. He rechecks many times and fails every time. His code is nearly the same as previous except a line of comment. > > I’m not sure if there’s any bug on this checking system and please take a look at our issue, thank you. — Slawek Kaplonski Senior software engineer Red Hat