Symptom: There are periodic leap second events which can add or delete a second to global time. When the leap second update occurs system may hang since operation system won't understand "60" seconds (normally clock goes from "59" second to "00" second).
Conditions: The leap second update will be propagated via Network Time Protocol (NTP).
Workaround: Option #1: An upgrade is required. Option #2: Shutdown the system prior to leap second occurs and start up after this event bypass the leap second event.