For information on specific abend codes, see z/OS MVS System Codes. Abends occurring in the background will be handled in the following manner:

XXX

ABEND code ‘xxx’ occurs when a command or the TMP abends. In this situation, the session terminates. If a SYSUDUMP or SYSABEND was allocated either in the JCL or with the ALLOCATE command, a dump occurs and the remainder of the commands in SYSTSIN are ignored.