Internal cinder volume plugin does not support PVs with VolumeMode=Block. It should be trivial to add it (incl. dynamic provisioning).
PR submitted: https://github.com/kubernetes/kubernetes/pull/64879
Verified on v3.11.0-0.28.0. The block volumeMode supports cinder and can be dynamically provisioned now.
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-2018:2652