Updating device-mapper-event fails with 'The running dmeventd instance is too old' in RHEL 5 or 6

Issue

• When updating packages with yum, the following error is displayed and subsequent packages are not installed:

    WARNING: The running dmeventd instance is too old.
    Protocol version 0 (required: 1). Action cancelled.
    error: %post(device-mapper-event-1.02.67-2.el5.x86_64) scriptlet failed, exit status 1

• After the update fails, two versions of device-mapper-event are installed.

    # rpm -qa |grep device-mapper-event
    device-mapper-event-1.02.67-2.el5
    device-mapper-event-1.02.63-4.el5

• After the update fails, the old version of dmeventd is still running, rather than the newly installed version.