PK15930: TRANSACTION CSKP NOT BEING DISPATCHED DUE TO PERFORMANCE RELATED PROBLEMS IN A CICS REGION.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Transaction CSKP is dynamically defined by CICS during startup
  to run at a priority of 1. The priority of CSKP is automatically
  increased during execution of CICS. When a CICS region
  experiences a heavy workload with non-system task running at a
  high priority CSKP will not get dispatched preventing trimming
  of the tail of the log. This will result in the Log Stream's
  dataset filling up resulting in the CICS region crashing. A MVS
  Logger code of DFHLG0772 X'00000008' X'0000085C' will be issued.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All.                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: Message DFHLG0772 issued, CICS crashed. *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The keypoint task CSKP should have trimmed the system log,
  however, because of higher priority tasks in the system, CSKP
  never got to first dispatch.  Had it done so its priority would
  have been immediately changed to 255.  Because CSKP was never
  dispatched, it was unable to trim DFHLOG which resulted in
  MSGDFHLG0772 and CICS termination.
  
  Keywords: KEYPOINTING KEYPOINTED KEYPOINT
  

Problem conclusion

• DFHRMXN4 has been change so that CSKP will be attached with
  a priority of 254.
  

Temporary fix

•             *********
              * HIPER *
              *********
  FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PK12463

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

  UK10688

Modules/Macros

•    DESRMXN  DFHRMXNC DFHRMXNE DFHRMXN2 DFHRMXN3
  DFHRMXN4 DFHRMXN5
  

Fix information

• Fixed component name

  CICSTS 3.1 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R400 PSY UK10688

     UP06/01/18 P F601

Fix is available

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