IBM MQ for z/OS abends

Abends can occur in WebSphere for z/OS® or other z/OS systems. Use this topic to understand the IBM MQ system abend codes and how to investigate abends which occur in CICS®, IMS, and z/OS.

IBM MQ for z/OS uses two system abend completion codes, X'5C6' and X'6C6'. These codes identify:

• Internal errors encountered during operation
• Diagnostic information for problem determination
• Actions initiated by the component involved in the error

X'5C6'

An X'5C6' abend completion code indicates that IBM MQ has detected an internal error and has terminated an internal task (TCB) or a user-connected task abnormally. Errors associated with an X'5C6' abend completion code might be preceded by a z/OS system code, or by internal errors.

Examine the diagnostic material generated by the X'5C6' abend to determine the source of the error that actually resulted in a subsequent task or subsystem termination.

X'6C6'

An X'6C6' abend completion code indicates that IBM MQ has detected a severe error and has terminated the queue manager abnormally. When an X'6C6' is issued, IBM MQ has determined that continued operation could result in the loss of data integrity. Errors associated with an X'6C6' abend completion code might be preceded by a z/OS system error, one or more X'5C6' abend completion codes, or by error message CSQV086E indicating abnormal termination of IBM MQ.

Table 1 summarizes the actions and diagnostic information available to IBM MQ for z/OS when these abend completion codes are issued. Different pieces of this information are relevant in different error situations. The information produced for a particular error depends upon the specific problem. For more information about the z/OS services that provide diagnostic information, see Diagnostic information produced on IBM MQ for z/OS.

Table 1. Abend completion codes

	X'5C6'	X'6C6'
Explanation	Error during IBM MQ normal operation	Severe error; continued operation might jeopardize data integrity
System action	Internal IBM MQ task is abended Connected user task is abended	The entire IBM MQ subsystem is abended User task with an active IBM MQ connection might be abnormally terminated with an X'6C6' code Possible MEMTERM (memory termination) of connected allied address space
Diagnostic information	SVC dump SYS1.LOGREC entry VRA data entries	SYS1.LOGREC VRA data entries
Associated reason codes	IBM MQ abend reason code Associated z/OS system codes	Subsystem termination reason code z/OS system completion codes and X'5C6' codes that precede the X'6C6' abend
Location of accompanying codes	SVC dump title Message CSQW050I Register 15 of SDWA section General Purpose Registers at Time of Error SYS1.LOGREC entries VRA data entries	SYS1.LOGREC VRA data entries Message CSQV086E, which is sent to z/OS system operator