PM79809: DFHPG0001 04E/AKEX ABEND RESULTS WHEN PM54748 IS APPLIED AND ATTEMPS TO DO A DISSOCIATE WHEN THERE IS N 13/03/12 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• DFHD2EX2 is performing a protected thread purge cycle. A thread
  is selected for purge and DFHD2D2 is called. A DB2 ASSOCIATE is
  issued. This returns a 00F30018 response but DFHD2D2 continues
  with a terminate thread request. This fails with a 00F30018
  error. A DB2 dissociate is then issued and a S04E abend occurs.
  DFHD2D2s recovery routine intercepts the abend. Code added by
  PM54748 detects that an error has occurred as part of a
  TERMINATE_THREAD call so automatically issues another DB2
  dissociate call. DFHD2D2 is still marked as in recovery by the
  CICS kernel. A second S04E abend occurs. This time the CICS
  kernel percolates the abend to the next stack level which
  is the DFHAPLI1 stack for DFHD2EX2. DFHAPLI1 percolates the
  abend to the DFHPGPG stack which issues a PG0001 dump. The long
  running CEX2 task now abends which prevents further protected
  thread purge cycles from running.
  .
  Additional Symptom(s) Search Keyword(s):
  04E abend04E S04E abendS04E AKEX uAKEX abendAKEX
  abenduAKEX PG0001
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users with UK77436 applied               *
  ****************************************************************
  * PROBLEM DESCRIPTION: A CICS/DB2 system with UK77436 applied  *
  *                      issues an AKEX abend S04E during a      *
  *                      protected thread purge cycle.           *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A PG0001 error is issued against the long running CEX2 system
  task which performs a regular purge cycle of protected DB2
  threads, and this prevents the cleanup of these threads from
  continuing.
  Keywords: DFHPG0001 msgDFHPG0001
  

Problem conclusion

• UK77436 UK78972
  An alteration has been made to the change introduced by UK77436
  in DFHD2D2, so that, if we have experienced a problem whilst
  still in an issuing_dissociate state, we don't issue a second
  dissociate call.
  Additionally, the call to DB2 which was previously issued at
  the end of the kernel recovery routine has now been moved so
  it is performed outside of the recovery routine.
  

Temporary fix

•             *********
              * HIPER *
              *********
  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:

  PM79958 PM80816 PM80818 UK93350

Modules/Macros

•    DFHDSMT  DFHD2CC  DFHD2CO  DFHD2DUF DFHD2D2
  DFHD2EX1 DFHD2EX2 DFHD2EX3 DFHD2MSB DFHD2RP  DFHD2STP DFHD2STR
  DFHD2TM  DFHD2TMT
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R700 PSY UK93350

     UP13/04/20 P F304 ®

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.