Comment 3 for bug 1639970

Noticed one more thing, the error appears in all three controllers, sequentially.

at ~1:14
http://logs.openstack.org/79/395379/2/check-tripleo/gate-tripleo-ci-centos-7-ovb-ha/5cdde75/logs/overcloud-controller-0/var/log/cinder/cinder-api.txt.gz#_2016-11-10_01_14_09_047

at ~1:15
http://logs.openstack.org/79/395379/2/check-tripleo/gate-tripleo-ci-centos-7-ovb-ha/5cdde75/logs/overcloud-controller-1/var/log/cinder/cinder-api.txt.gz#_2016-11-10_01_15_01_741

at ~1:16
http://logs.openstack.org/79/395379/2/check-tripleo/gate-tripleo-ci-centos-7-ovb-ha/5cdde75/logs/overcloud-controller-2/var/log/cinder/cinder-api.txt.gz#_2016-11-10_01_16_00_111

Looks like all three controllers are asked to create the volume, and all are unable to allocate memory.

This is another point in favor of test env memory shortage under heavy load.