IMS™ uses this code when forcibly terminating one MVS™ task from another MVS task. There are two situations where this occurs:

1. An ESTAE routine has gained control due to an abend in the system. The abended task (ESTAE) attempts to purge the log buffers and signals the physical log task of its intention. If the ESTAE task does not receive a response within one second, the physical log task is terminated with this abend code and log buffers are purged.
2. The DBRC instance required for this instance of ILS has terminated. All remaining ILS instances dependent upon the abended DBRC will wait for that DBRC and abend with reason code X'01'.