With enormous help of Daniel Alvarez, we were able to root cause analyse this issue. We merged functional tests using conntrack [1] and then later Ubuntu kernel at the gate was bumped from 4.4.0-87.110 to 4.4.0-89.112. The newer kernel contains a bug in conntrack and all conntrack calls get stuck, the process can't be even killed by sending a SIGKILL signal.
With enormous help of Daniel Alvarez, we were able to root cause analyse this issue. We merged functional tests using conntrack [1] and then later Ubuntu kernel at the gate was bumped from 4.4.0-87.110 to 4.4.0-89.112. The newer kernel contains a bug in conntrack and all conntrack calls get stuck, the process can't be even killed by sending a SIGKILL signal.
http:// logs.openstack. org/53/ 490753/ 3/check/ gate-neutron- dsvm-functional -ubuntu- xenial- nv/68f386d/ logs/syslog. txt.gz# _Aug_09_ 05_28_58