PI67693: MQ RECEIVED AN ABN=052-00000102 WHICH HAS LED TO THE STALLING OF CHECKPOINTING BY THE QUEUE-MANAGER.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• MQ QMR received an ABN=052-00000102
  .
  ABN=052-00000102,U=SYSOPR,SSSC-CSQ3IDEN,
  M=CSQ3IDES,PSW=070C10009BB04448,ASID=0002
  .
  abend which has led to the stalling of checkpointing
  by the queue-manager.
  The problem occurs when there is an indoubt unit of
  work in CICS involving MQ, and CICS instructs the
  queue-manager to commit or backout. The queue-manager
  aborts or commits the unit of work, and then starts
  deallocation processing for the thread structure control
  blocks.
  .
  
  Additional Symptom(s) Search Keyword(s):
  ABEND052 ABENDS052 052 S052 S0052
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users of IBM MQ for z/OS Version 9.                      *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Abend 052-00000102 or 052-00000103 can                       *
  * occur during connect processing, if an                       *
  * indoubt UR associated with the same                          *
  * address space is in resolve indoubt                          *
  * processing at the same time.                                 *
  *                                                              *
  * The error can also lead to the                               *
  * checkpoint processor hanging,                                *
  * preventing any further checkpoints                           *
  * being written to the recovery logs.                          *
  * This can result in various symptoms                          *
  * when the queue manager is restarted                          *
  * including:                                                   *
  * - extended restart times                                     *
  * - Abend 5C6-00E20004 in CSQSVBK, and                         *
  *   queue manager startup failing                              *
  * - Abend 5C6-00D1032A in CSQJR003, and                        *
  *   queue manager startup failing.                             *
  * In some cases the lack of checkpoints                        *
  * in the recovery logs can require the                         *
  * queue manager to be cold started.                            *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * None                                                         *
  ****************************************************************
  A timing window exists such that CSECT CSQ3RIS0 may attempt to
  terminate an agent being terminated by CSECT CSQ3RIA0 or
  CSQ3RIM0 during resolve indoubt processing. This results in
  the agent structure being used by 2 different threads, leading
  to the reported symptoms.
  

Problem conclusion

• The timing window has been eliminated such that a thread will
  not be terminated while resolve indoubt processing is running.
  

Temporary fix

Comments

APAR Information

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

  PI67141

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

  010PC2Ÿ UI40632

Modules/Macros

• CSQ3RIA0 CSQ3RIM0 CSQ3RIS0
  

Fix information

• Fixed component name

  MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI40632

     UP16/10/14 P F610

Fix is available

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