PK62455: DFHPC0409 ABENDS ASRA AND ASRA HAVE BEEN ISSUED WHILE PROCESSING ABEND ASRA FOR THE SAME TASK

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• From the trace, the task initally looped with the
  following,
  EIP   EXIT  SEND-TC  NOTALLOC 08F4,000
  APLI  ENTRY GOTO     27438198,COBOL,001073E8
  APLI  EXIT  GOTO/OK  00100290,00100228,00CFBED8
  EIP   ENTRY SEND-TC
  UEH   EVENT LINK-TO-USER-EXIT-PROGRAM
              GLUEEXIT AT EXIT POINT XEIOUT
  UEH   EVENT RETURN-FROM-USER-EXIT-PROGRAM
              GLUEEXIT WITH RETURN CODE 0
  PGHM  ENTRY INQ_CONDITION         3D
  PGHM  EXIT  INQ_CONDITION/OK
              AEYY,27438198,001073E8,COBOL,80,HAND
  EIP   EXIT  SEND-TC  NOTALLOC  08F4,000
  APLI  ENTRY GOTO     27438198,COBOL,001073E8
  APLI  EXIT  GOTO/OK  00100290,00100228,00CFBED8
  EIP   ENTRY SEND-TC  0004,001
  UEH   EVENT LINK-TO-USER-EXIT-PROGRAM
              GLUEEXIT AT EXIT POINT XEIOUT
  UEH   EVENT RETURN-FROM-USER-EXIT-PROGRAM
              GLUEEXIT WITH RETURN CODE 0
  PGHM  ENTRY INQ_CONDITION         3D
  PGHM  EXIT  INQ_CONDITION/OK
              AEYY,27438198,001073E8,COBOL,80,HAND
  :
  until
  EIP   ENTRY SEND-TC 0004,00
  UEH   EVENT LINK-TO-USER-EXIT-PROGRAM GLUEEXIT
              AT EXIT POINT XEIOUT
  UEH   EVENT RETURN-FROM-USER-EXIT-PROGRAM GLUEEXIT
              WITH RETURN CODE 0
  APLI  *EXC* Program-Check         START_PROGRAM
  .
  Regarding to PK49925 fix, this apar is created for second issue
  we found in DFHETC.
  If DFHKETIX is driven while we are in DFHETC, as part of the
  EXEC CICS SEND, while looping back and forth from the
  application, then DFHAPLI1's stack will be marked at +1
  with x'08' (KERNLCON). We then end up loosing DFHKERRU from the
  R14 slot in the stack but with the bit set on and the same
  subsequent symptoms described in PK49925.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All.                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: Recursive abend ASRA & CICS terminated. *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  In the reported problem, a task was looping and DFHKETIX was
  driven to possibly abend the runaway task, however, this
  resulted in recursive abends and CICS terminated.
  
  DFHKETIX contains code to invoke runaway task abend processing
  by means of a STIMER 'pop'. Usually, DFHKETIX would update
  DFHAPLI1's stack with KERNLCON (the loop controller bit) and
  populate the R14 slot with the address of DFHKERRU, all ready to
  'pop' the runaway task. However, a path exists where control can
  return to DFHETC (from DFHKETIX) and the R14 slot in DFHAPLI1's
  stack is overwritten with the return address of DFHEIP, so the
  stack now has the loop controller (KERNLOCN) bit on but the R14
  slot does not address DFHKERRU. This is an invalid combination.
  As a consequence of this stack corruption, recursive abend
  ASRA's caused CICS to terminate.
  
  Keywords:  MSGDFHPC0409 PC0409 ABENDASRA 0C4 S0C4 ABEND0C4
             ABENDS0C4
  

Problem conclusion

• DFHETC has been modified by the addition of compare and
  swap code in stack manipulation routines to prevent an invalid
  combination in the stack of KERNLOCN being set on and the
  return address slot containing the return address to DFHEIP.
  

Temporary fix

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

Comments

APAR Information

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

  PK56400

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

  UK35299 UK35300

Modules/Macros

•    DFHETC
  

Fix information

• Fixed component name

  CICSTS V3 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R400 PSY UK35299

     UP08/04/09 P F804

• R500 PSY UK35300

     UP08/04/12 P F804

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.