PH62807: ABN=602-00000000,U=XXXXXXXX,C=MQ900.920.MMC -CSQM1P1W,M=CSQGFRCV,PSW=XXXXXXXXXXXXXXXX,ASID=XXXX

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• PH58940 changed the recovery code for MQ's end context RRS exit
  to clean up if the exit was abended by the application detaching
  the TCB, specifically while the exit was in progress, to prevent
  handles owned by the ending context being subsequently posted.
  The 602 abend in this case has a similar cause, namely that the
  application is detaching the TCB while it is going through end
  context processing, however in this case the detach occurs
  on/before the call to MQ's RRS exits, before any recovery code
  can be established. This APAR was raised to investigate how the
  602 abend can be avoided in the more general case where the
  detach occurs before MQ's exit can be called or can establish
  recovery to handle the condition.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 2 Modification 0, Release 3          *
  *                 Modification 0 and Release 4 Modification 0. *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend S602 occurs in CSQM1P1W following *
  *                      termination of an MQ RRS application.   *
  ****************************************************************
  An RRS application TCB terminated after issuing MQGET with
  MQGMO_SET_SIGNAL without explicitly closing the queue handle.
  During end of task processing MQ's end context exit would
  normally implicitly close the handle, however the application
  issued DETACH against the ended TCB before end of task
  processing had completed. If the detach took effect prior to
  MQ's exit being called and establishing recovery, the implicit
  close cannot take place. When the handle is subsequently posted
  (for example, due to message arrival, wait interval expiry or
  queue manager shutdown), an attempt is made to post the provided
  ECB, however the address space containing the ECB no longer
  exists, resulting in abend 602.
  

Problem conclusion

• Additional validation is added to prevent the post being issued
  against an address space that no longer exists.
  

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:

  UO03111 UO03112 UO03113

Modules/Macros

• CSQM1P1W CSQMALL
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R200 PSY UO03113

     UP25/06/11 P F506

• R300 PSY UO03112

     UP25/06/11 P F506

• R400 PSY UO03111

     UP25/06/11 P F506

Fix is available

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