PI28479: WMQ Z/OS 8.0.0:ABN=0C4-00000004 LOC=CSQMLPLM.CSQNSINF

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Below 0C4 ABEND in CSQNSINF was reported when processing an
  ALTER CHL command for channel CHL1 with QSGDISP(GROUP):
  TITLE=CSQ1,ABN=0C4-00000004,U=IBMUSR1 ,C=W9700.800.CMD
  -CSQNSINF,M=CSQGFRCV,LOC=CSQMLPLM.CSQNSINF
  
  Command events are enabled, and so an event message is
  generated and put to SYSTEM.ADMIN.COMMAND.EVENT,
  however this queue does not exist. CSQMQCLU detects that the
  put of the event message failed, and attempts to queue a
  control block so it can be retried later. However when it calls
  CSQNSINF it does not pass all of information needed by CSQNSINF
  for group commands.
  This leads to an attempt to access the RGRP control block using
  a null  pointer, leading to the 0C4 occurring.
  
  
  Additional Symptom(s) Search Keyword(s):
  

Local fix

• Disable command events, or ensure SYSTEM.ADMIN.COMMAND.EVENT
  exists.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend 0C4 in CSQNSINF occurs when       *
  *                      issuing commands with QSGDISP(GROUP) if *
  *                      command events (CMDEV) are enabled and  *
  *                      messages fail to be put to              *
  *                      SYSTEM.ADMIN.COMMAND.EVENT (for         *
  *                      example, if this queue does not exist). *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  After successfully processing a QSGDISP(GROUP) command, a flag
  is set to indicate that there are additional messages to
  broadcast to all queue managers in the qsg to issue the commands
  with QSGDISP(COPY). When CSQMRMMS is called to generate the
  command message, it calls CSQMQCLU to put the event message to
  the event queue. If the event queue cannot be put to, CSQMQCLU
  calls CSQNSINF to queue a control block so that the generation
  of the event message can be retried. However the flag that was
  set causes CSQNSINF to incorrectly determine the origin of the
  command, leading to it taking an incorrect code path and the
  consequent abend 0C4.
  

Problem conclusion

• CSQ9SCNP is changed to set the flag after CSQMRMMS is called to
  generate the event message, preventing the problem occurring.
  

Temporary fix

Comments

APAR Information

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

  PI26526

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

  UI23903

Modules/Macros

• CSQ9SCNP
  

Fix information

• Fixed component name

  WMQ Z/OS 8

• Fixed component ID

  5655W9700

Applicable component levels

• R000 PSY UI23903

     UP15/01/29 P F501

Fix is available

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