PH18877: INVALID ASCB CAUSED ABEND=SEC6 U0000 REASON=0000FF09 DURING SHUTDOWN

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The CSQFAMSM address space had already ended - this was due to
  being killed by with signal 9 SIGKILL (IEF450I CSQFAMSM
  CSQFAMSM - ABEND=SEC6 U0000 REASON=0000FF09), and so the ASCB
  stored in the queue manager was no longer valid. During queue
  manager shutdown CSQ0BSTP attempts to post the ECB in the AMSM
  address space using this ASCB, which fails with the abend 602
  and captures the reported dump in this situation.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Following abnormal termination of the   *
  *                      AMSM address space, the queue manager   *
  *                      fails to terminate, resulting in        *
  *                      various symptoms which can include:     *
  *                                                              *
  *                      - 0D6 abends when applications call     *
  *                        MQ and AMS services are required      *
  *                                                              *
  *                      - Abend 602-00000000 during normal      *
  *                        queue manager termination             *
  ****************************************************************
  When AMS identifies with the queue manager, an incorrect
  termination ECB address is used.
  If AMS terminates abnormally, EOT processing posts this address,
  resulting in the AMS ASID value in the G0BL being overlaid.
  When CSQ0EOMC checks if a terminating TCB is from the AMSM
  address space, it incorrectly determines that the TCB is not,
  due to the overlaid value, and does not call CSQ0DEAD to
  terminate the queue manager.
  
  The queue manager does not expect to be running with AMS enabled
  but no longer running, resulting in unexpected behaviour.
  

Problem conclusion

• The correct ECB address is passed during identify processing,
  preventing the overlay of the asid in the G0BL, and consequently
  allowing the queue manager to be terminated abnormally in the
  event of abnormal AMS termination.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UI69703

Modules/Macros

• CSQ0DPCS CSQVATRM
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R100 PSY UI69703

     UP20/08/08 P F008 ¢

Fix is available

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