PI18398: FIXED POINT OVERFLOW EXCEPTION IN DFHKEDOM (UK73859 LEVEL) AT OFFSET X'C9A'.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• You are getting a KERNDUMP of DFHKE0201 About to take a SDUMP.
  DUMPCODE: KERNDUMP, DUMPID: n/nnnn. (MODULE DFHKESTX).
    The Kernal data shows you are actually getting an abend 0C8
  fixed-point-overflow exception.  The abend0C8 is occuring in
  DFHKEDOM at offset C9A.
  PROGRAM_CHECK        0C8/AKEA  DFHKEDOM  00000C9A
  You find this is occuring after an End-of-Task True has been
  invoked.  The PSW PROGRAM MASK BIT 20 is set on when in fact it
  should be set off.   Your KCB_GUARD_COUNT at time of the
  failure is 7FFFFFFF and CICS is attempting to get a new segment
  off the global free chain when it encounters the abend0C8
  because the fixed point overflow program mask bit 20 is on.
  Additional Symptom(s) Search Keyword(s): KIXREVRJS
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: S0C8 fixed point overflow exception     *
  *                      while processing DFHKEDOM LOOP_31 to    *
  *                      allocate a new stack segment.           *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  DFHKEDOM was processing code at label LOOP_31 to allocate a new
  stack overflow segment when an 0C8 fixed point overflow
  exception occurred. The KCB_GUARD_COUNT at the time of failure
  was found to be x'7FFFFFFF'.
  Under ordinary circumstances, this should not generate an
  exception. In this case, however, the fixed point overflow
  program mask bit in the PSW had been set on. This is not
  expected to be on while executing CICS code.
  The cause was found to be an end of task TRUE setting the fixed
  point overflow mask bit on in the PSW. CICS does not clear the
  program mask bits after the execution of an end of task TRUE, so
  the setting of the program mask bits was inherited by the next
  task to run on the same TCB. It happened that the task needed to
  get a new stack segment while the guard count was at x7FFFFFFF
  before the program mask bits were next reset.
  

Problem conclusion

• DFHERM has been updated to clear the program mask (bits 20-23)
  of the PSW after invoking an end of task TRUE.
  This APAR does not affect start of task TRUEs.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PI13487

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

  UI19495 UI19496

Modules/Macros

• DFHERM
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R800 PSY UI19496

     UP14/07/17 P F407

• R900 PSY UI19495

     UP14/07/17 P F407

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.