PI66133: WMQ Z/OS ABEND5C6-00D40025 IN CSQMLTR0 USING SHARED QUEUES

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Queue manager abended
  CSQV086E QUEUE MANAGER ABNORMAL TERMINATION REASON=00E50702
  
  
  Dump title:
  ABN=5C6-00D40025,U=SYSOPR,MMC-CSQMLTR0,
  M=CSQGFRCV,LOC=CSQMLPLM.CSQMLTR0
  
  
  Reason code X'00D44007' CSQM_ABEND_MMC_ERROR
  
  
  There is a window in which a shared queue may be deleted,
  causing fields in the IVSA to be cleared (e.g. IVSA.pVSObject)
  and at the same time a list-transition event may execute which
  refers to the cleared IVSA, resulting in the 5C6-00D40025 abend.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users of IBM MQ for z/OS Version 9 Release 0             *
  * Modification 0.                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Various abends occur when a shared queue is deleted on a     *
  * different queue manager in the queue sharing group, and the  *
  * local queue manager is processing a list transition for the  *
  * queue.                                                       *
  *                                                              *
  * Symptoms can include:                                        *
  * - Abend 0C4 in CSQMLTR0                                      *
  * - Abend 5C6-00C5101A in CSQEBMON                             *
  * - Abend 5C6-00D40025 in CSQMLTR0                             *
  * - Abend 5C6-00E50002 in CSQMREF1                             *
  * The abends are followed by abnormal queue manager            *
  * termination 6C6 with REASON=00E50702                         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * none                                                         *
  ****************************************************************
  Insufficient serialisation between list transition exit
  processing for a shared queue and shared queue deletion
  processing can allow CSQICDSQ to free the IVSA for a shared
  queue that has just been deleted on another queue manager in the
  queue sharing group, while a list transition is being processed
  for that shared queue.
  Depending on the type of list transition being processed, and
  how quickly the freed IVSA is reused by another queue, this can
  lead to several different abends occurring in list transition
  processing.
  The abnormal termination of the SRB processing the list
  transition is unexpected, and results in the queue manager
  terminating abnormally.
  

Problem conclusion

• The serialisation between shared queue deletion and list
  transition processing is improved to prevent the IVSA being
  freed while still being used by list transition processing.
  

Temporary fix

Comments

APAR Information

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

  PI63204

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

  UI41300

Modules/Macros

• CSQELTRX CSQICDSQ CSQIEXP2 CSQMLTR0 CSQMLTRX
  

Fix information

• Fixed component name

  MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI41300

     UP16/10/14 P F610

Fix is available

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