PK31442: DFHDS0001 CICSXX64 AN ABEND (CODE 0C4/AKEA) HAS OCCURRED AT OFFSET X'3042' IN MODULE DFHDSIT.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• DFHDSIT does not have a check for zeros as a stopper when it
  loads in NEXT_TCB. This causes 00000000 to be passed up to the
  loop +X'300C' in REG10. This is what causes the ABEND0C4.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: DFHDS0001 An abend code 0C4/AKEA has    *
  *                      occurred at offset x'3042' in module    *
  *                      DFHDSIT.                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  During DS initialization, DFHDSDM requested the Timer Domain to
  set up a system task to run repeatedly.The Timer Domain
  attaches this task approximately every 5 minutes.This wakes up
  DFHKETI and it calls PROCESS_NOTIFY which issues,
  DFHKEDSM FREE_TCBS
  This scans the KTCB table for TCBs which have been detached and
  when it finds a candidate for having its blocks freed, issues:
  DFHDSITM FREE_TCB
  To do this, remove_from_subd_chain(tcb_ptr); is called. If the
  TCB to be removed happens to be the last in chain it will have
  a zero NEXT_TCB pointer. DFHDSIT invalidly loads this NEXT_TCB
  as valid TCB address and incorrectly attempts to loop around
  the chain of TCBs for this TCB mode . As a result it loads an
  invalid address from low core and a program check (0C4) occurs.
  Additional Keywords: DS0001 S0C4 abendS0C4
  

Problem conclusion

• DFHDSIT has been corrected to exit the 'do repeat while' loop
  in remove_from_subd_chain: as soon as the TCB is found,
  unchained and the TCB count decremented.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

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

  UK20030

Modules/Macros

•    DFHDSIT
  

Fix information

• Fixed component name

  CICSTS 3.1 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R400 PSY UK20030

     UP06/11/29 P F611

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.