Looks like another hit of bug 1643911 :
http://logs.openstack.org/49/414549/4/check/gate-tempest-dsvm-neutron-full-ubuntu-xenial/58aecae/logs/screen-n-cpu.txt.gz?level=TRACE#_2017-02-07_10_03_15_458
http://logs.openstack.org/49/414549/4/check/gate-tempest-dsvm-neutron-full-ubuntu-xenial/58aecae/logs/syslog.txt.gz#_Feb_07_10_03_10
Looks like another hit of bug 1643911 :
http:// logs.openstack. org/49/ 414549/ 4/check/ gate-tempest- dsvm-neutron- full-ubuntu- xenial/ 58aecae/ logs/screen- n-cpu.txt. gz?level= TRACE#_ 2017-02- 07_10_03_ 15_458
http:// logs.openstack. org/49/ 414549/ 4/check/ gate-tempest- dsvm-neutron- full-ubuntu- xenial/ 58aecae/ logs/syslog. txt.gz# _Feb_07_ 10_03_10