PH55062: ABENDS5C6-00C5101D,C=MQ900.920.CFM - CSQECLOS,M=CSQGFRCV,LOC=CSQELPLM.CSQECLOS+00003670

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• After investigation of this problem, it appears there are two
  copies of the queue, where we suspect that the MQSH has been
  overwritten. The abend occurred during shared queue close
  processing where we expected that the STRB and SQVT control
  blocks should have been orphaned following us losing connection
  to the structure, however this orphan processing didn't appear
  to have been driven in its entirety, ultimately resulting in
  the abend following a consistency check.
  
  Unfortunately we have been unable to identify the root cause of
  this problem, although we suspect that the MQSH being
  overwritten is likely to have caused this behaviour. However,
  we cannot see the MQSH being overwritten in the dump. For this
  reason, we would like to investigate how we could improve our
  diagnostics in this area to help us identify this problem at
  the time closer to which the MQSH may have been overwritten if
  it occurs again in the future.
  

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: CSQECLOS abends with 5C6-00C5101D and a *
  *                      follow on 5C6-00C510AD abend is issued  *
  *                      as the initial abend was on a structure *
  *                      task. This results in Queue Manager     *
  *                      termination.                            *
  ****************************************************************
  Two copies of the same queue exist leading to CSQECLOS abending
  with 5C6-00C5101D and a follow on 5C6-00C510AD as part of a
  consistency check. As the initial abend was on a structure
  task the Queue Manager terminates.
  
  The reason for the existence of the duplicate queue is currently
  unknown.
  

Problem conclusion

• New diagnostic code has been added to capture additional
  documentation to aid in the diagnosis of understanding why the
  duplicate queue exists. By default this new diagnostic code is
  disabled, please contact IBM support to enable it.
  

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:

  UI97770 UI97771 UI97772

Modules/Macros

• CSQ7CBZ2 CSQIESEL CSQIRECP
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R200 PSY UI97772

     UP24/09/25 P F409

• R300 PSY UI97771

     UP24/09/25 P F409

• R400 PSY UI97770

     UP24/09/25 P F409

Fix is available

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