PH66174: A SMALL TIMING WINDOW IN THE STOPCKTI PROCESSING ALLOWS PARTIAL CLEAN-UP OF SOME OF THE CKTI RELATED INFORMATION

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• We identify a small timing window in the STOPCKTI processing,
  due to the asynchronous nature of this area of the product, and
  the use of EXEC CICS LINK to interact with CKQC. This timing
  window allows partial clean-up of some of the CKTI related
  information which is used by CKQC (DFHMQSSQ) to identify CKTI
  tasks which have been initiated by it, if this processing
  overlaps with a related STARTCKI command. This timing window
  only occurs when a significant number of STOPCKTI and subsequent
  STARTCKTI commands are issued within a short period of time of
  each other, allowing parts of the processing related to CKQC to
  overlap. This window only appears possible due to the number of
  commands issued, and the related work because of the
  asynchronous nature of the CICS-MQ trigger monitor and its
  commands being issued in this sort of manner.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Second CKTI for the same MQ Initiation  *
  *                      Queue.                                  *
  ****************************************************************
  There is a timing window within the CICS MQ code (DFHMQSSQ and
  DFHMQTRQ) when performing actions on the CKTI transactions,
  such as Starting and Stopping them.
  It is possible for there to be 2 CKTI transactions for the same
  MQ Initiation Queue.
  The CKQC transaction will not find this second CKTI transaction
  nor will a STOPCKTI command be able to stop it.
  
  Keywords: DFHMQ0383D DFHMQ0384D DFHMQ0385D MQ0383 MQ0384 MQ0385
  

Problem conclusion

• CICS has been changed to add an enqueue when manipulating the
  CKTI transaction.
  Tracing has been added to DFHMQTRQ.
  Messages DFHMQ0383D, DFHMQ0384D and DFHMQ0385D now have the
  name of the initiation queue included.
  

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:

  PH66771 UO04380

Modules/Macros

• DFHEIQMQ DFHMEMQC DFHMEMQE DFHMEMQK DFHMQAEX DFHMQBAS DFHMQBR9
  DFHMQCOD DFHMQCON DFHMQCTL DFHMQDIS DFHMQDSC DFHMQDSL DFHMQIG
  DFHMQIN1 DFHMQMNS DFHMQMON DFHMQPOP DFHMQPRM DFHMQPUL DFHMQQCN
  DFHMQRET DFHMQRP  DFHMQRS  DFHMQSSQ DFHMQTM  DFHMQTRC DFHMQTRD
  DFHMQTRI DFHMQTRQ DFHMQTRU DFHMQTSK
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R300 PSY UO04380

     UP25/08/06 P F508

Fix is available

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