Similar to bug 1267576 for Nova, qemu-img calls should be restricted by ulimit as a security measure.
https://rhos-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/RHOS/view/RHOS9/job/qe-phase2-9-rhel-7.3-openstack-all-in-one-neutron-rabbitmq/7/ openstack-cinder-8.1.1-4.el7ost.noarch
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHSA-2016-2923.html