PH08106: MQ V9: ABEND 5C6-0C91096 IN MSTR ADDRESS SPACE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The issue occurs because of the qmgr's configuration for event
  messages, and a particular failure which results in an event
  message being generated.
  
  An application is putting to a topic in MQ, but one of the
  subscriber's queues is not available (e.g. it is not defined,
  resulting in an unknown object name).
  
  This causes an event message to be put to the
  SYSTEM.ADMIN.QMGR.EVENT
  queue. In the customer's case SYSTEM.ADMIN.QMGR.EVENT has been
  redefined as a topic alias. This means that the put of the
  event message is to a topic.
  
  The publish of the event message is performed while the task is
  part-way through the original publish of the application
  message. In some cases, the qmgr is not able to correctly
  manage the thread state with two
  publishes active at the same time. This results in an unexpected
  state, causing the 5C6-00C91096 abend to be issued by CSQIRSAV.
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 0 Modification 0 and Release 1       *
  *                 Modification 0.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend 5C6-00C91096 in CSQIRSAV when     *
  *                      publishing a message causes an event    *
  *                      message to be generated, and the        *
  *                      event queue is a topic alias.           *
  ****************************************************************
  During publish processing, depending on the message delivery
  options for the topic (PMSGDLV/NPMSGDLV), CSQMTPUT can start
  a nested unit of work for the publish operation.
  If an event message is generated during the publish operation,
  for example, due to attempting delivery to a subscriber with an
  invalid destination, and the event queue has been redefined as
  a topic alias, the publication of the event message can also
  result in a nested unit of work being created.
  However this fails if the parent operation had also created a
  nested unit of work, leading to the reported abend.
  

Problem conclusion

• CSQMTPUT has been changed to no longer create a nested unit of
  work when publishing an event message.
  

Temporary fix

Comments

APAR Information

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

  PI95279

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

  UI61530 UI61531

Modules/Macros

• CSQMTPUT
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI61530

     UP19/04/11 P F904

• R100 PSY UI61531

     UP19/04/11 P F904

Fix is available

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