As per https://github.com/kubernetes/kubernetes/issues/49418 controller-manager can crash in certain cases when volume spec present in attach/detach controller becomes nil. We need to cherry-pick the fix to 1.6 release.
PR - https://github.com/openshift/ose/pull/807
Tested with the advisory version and there are no regressions.
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://access.redhat.com/errata/RHBA-2017:3049