PI58225: WMQ CICS TRIGGER MONITOR STOPS GETTING MESSAGES FROM INIT QUEUE 16/03/01 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• After you apply a new RSU level, instances of the CICS trigger
  monitor stop picking up messages from the initiation queue.
  Change Team finds that this symptom occurs after application of
  the fix for PI52987 (ie. UI33363 ) where MTHR.csTtoken may
  contain a residual value
  .
  Additional keywords:
  CKTI GETWAIT MQGET
  CURDEPTH is non-zero for the application and initiation queues
  initq filling fills full 2053 MQRC_Q_FULL
  hang hung hanging stall stalled
  .
  Note: It was initially thought that altering the undocumented
  CICSFastDealloc tuning parameter would prevent the problem,
  but that is not the case.
  

Local fix

• Restart CKTI or the CICS adapter (CKQC), but be aware of the
  problem in CICS APAR PI56884.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: CICS transactions issuing MQGET with    *
  *                      MQGMO_WAIT or MQGMO_SET_SIGNAL are not  *
  *                      always posted when messages arrive or   *
  *                      the get wait interval expires following *
  *                      application of UI33363.                 *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  PI52987 changed CSQM1P1W to check if any ACEs are queued for
  deferred termination processing in the address space of the
  handle being posted, and if so to check the TCB associated with
  the handle is still valid before posting it.
  This check is performed using the tcbtoken for the TCB stored
  in the task's mthr.
  However in the CICS environment it is possible that the MTHR
  contains an out of date tcbtoken, causing CSQM1P1W to
  incorrectly determine that the TCB is no longer valid and
  skip posting the handle.
  

Problem conclusion

• CSQMCETH and CSQMALL are changed to prevent out of date
  tcbtoken's remaining in the mthr when it is reused in a CICS
  environment.
  000Y
  CSQMALL
  CSQMCETH
  CSQM1P1W
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  PI58645 UI36297

Modules/Macros

• CSQMALL  CSQMCETH CSQM1P1W
  

Fix information

• Fixed component name

  WMQ Z/OS 8

• Fixed component ID

  5655W9700

Applicable component levels

• R000 PSY UI36297

     UP16/04/15 P F604 ­

Fix is available

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