PH53025: ABN=5C6-00C51134,LOC=CSQELPLM.CSQEMGEC+XXXXXXXX

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A get message under cursor request failed for a browse locked
  message from a shared queue because the provided buffer was too
  small. The browse lock was released on the message by moving it
  from the uncommitted get queue back to the original put queue.
  A code defect in CSQIMGES prevented the lock in the browse
  cursor in the message handle from being cleared. A subsequent
  get under cursor request then failed to read the message with
  ixlRsnCodeBadEntryList because the logic erroneously determined
  that the message was still browse locked so looked for the
  message on the wrong list header.
  
  This resulted in abends:
  
  ABN=5C6-00C51134,LOC=CSQELPLM.CSQEMGEC+xxxxxxxxx
  ABN= 5C6-00E7014F,LOC=CSQXADPM.CSQXADPM+xxxxxxxx
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 3 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: An application issuing an MQGET to a    *
  *                      shared queue with                       *
  *                      MQGMO_BROWSE_MSG_UNDER_CURSOR and       *
  *                      MQGMO_LOCK causes an 5C6-00C51134 abend *
  *                      in the Queue Manager and an             *
  *                      5C6-00E7014F abend in the Channel       *
  *                      Initatior if the application is         *
  *                      connecting into MQ via the Channel      *
  *                      Initatior.                              *
  ****************************************************************
  An application issuing a combination of MQGET calls to a shared
  queue causes an 5C6-00C51134 abend in the Queue Manager and an
  5C6-00E7014F abend in the Channel Initiator if the application
  is connecting into MQ via the Channel Initiator.
  
  The failing MQGET call provided the Get Message Options
  MQGMO_BROWSE_MSG_UNDER_CURSOR and MQGMO_LOCK.
  
  The browse cursor lock was not being correctly cleared in the
  message handle by a previous MQGET. The abends are then caused
  by the following MQGET call because the message was incorrectly
  still browse locked and an attempt was made to look for the
  message on the wrong list header.
  

Problem conclusion

• The code has been corrected so that the browse cursor lock is
  now correctly cleared.
  

Temporary fix

Comments

• ×**** PE24/06/24 FIX IN ERROR. SEE APAR PH62018  FOR DESCRIPTION
  

APAR Information

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

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

  UI93590

Modules/Macros

• CSQIMGES CSQMGET
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R300 PSY UI93590

     UP23/10/10 P F310

Fix is available

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