When AWS EBS CSI driver is deployed with OCP sidecars, csi-external-provisioner and csi-external-attacher cannot access unix domain socket provided by the CSI driver. All CSI sidecars run as a dedicated user (e.g. csi-provisioner, usually with UID 1000), while the driver runs as root. The driver creates its socket with permissions 0755, not allowing the sidecars to write to the socket.
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-2019:2922