PK58477: DFHAP0001 ABEND0C4 IN DFHXTP OFFSET 33EC DFHSR0622 ATTEMPT TO OVERWRITE ERDSA DFHAP0002 CODE D509

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A transaction in an AOR issued a RETURN using a CONTAINER back
  to the TOR. The TOR then received the following errors:
  DFHSR0622  An attempt to overwrite the ERDSA has
             caused the abend which follows
  DFHAP0001  An abend (code 0C4/AKEA) has occurred at
             offset X'000033EC' in module DFHXTP.
  DFHAP0002  A severe error (code X'D509') has
             occurred in module DFHUEH.
  Looking at internal trace, we see module DFHAPCR got an error
  on function IMPORT_ALL :
  4E0B APCR  *EXC* - DFHTC_error - FUNCTION(IMPORT_ALL)
              TERMINAL_TOKEN(1868CBD0) DATA_START(38A)
              COMMAND(RETURN)
              Response 10   Abend...} Sense 0C020051
  This problem is the same as PK35533 except that it
  is for transaction routing.
  Additional Symptom(s) Search Keyword(s):
  KIXREVRJL
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend 0C4 in module DFHXTP at offset    *
  *                      x'33F4' (in TOR) when transaction in    *
  *                      AOR issues an EXEC CICS RETURN with     *
  *                      more than 32K of CHANNEL data and byte  *
  *                      2 of the final buffer contains a x'07'. *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A Transaction Routed application executing in an AOR over an MRO
  link issues an EXEC CICS RETURN with the CHANNEL option. As the
  CHANNEL data is greater than 32767, DFHAPCR sends the first
  buffer with the FMH option specified on the TC WRITE
  instruction.
  
  On return to DFHZTSP's DETACH routine (RDLASTOP) the final
  buffer of data is incorrectly sent with the FMH option.
  When this buffer is received in the TOR, as it contains the FMH
  option and the user data just happens to include a x'07' in
  position 2 of the TIOA, DFHZARQ assumes that this is an ABORT
  request (FMH07).
  
  This results in :-
  DFHSR0622 An attempt to overwrite the ERDSA.
  DFHAP0001 An 0C4 abend at x'33F4' in DFHXTP and a system dump.
  DFHSM0102 A storage violation (x'030B') and a system dump
            followed by the loss of the CICS region at shutdown.
  
  
  A similar problem exists when the larger Channel data is
  Transaction Routed back from the TOR to be processed in the
  AOR. This time DFHZTSP's ROUTE routine (ROUTENT) will send the
  final buffer of data with the FMH option even though DFHAPCR's
  EXPORT_ALL may already have sent it.
  
  Again if x'07' is in position 2 of the final buffer, DFHZARQ
  assumes that this is an ABORT request (FMH07).
  This results in an attempt to overwrite the ERDSA (DFHSR0622) in
  the AOR, followed by an 0C4 abend in DFHXTP at offset x'33F4'
  (DFHAP0001) followed by 7 further abends and the loss of CICS.
  
  Additional keywords
  msgDFHSR0622 msgDFHAP0001 msgDFHSM0102 SR0622 AP0001 SM0102 S0C4
  abendS0C4
  

Problem conclusion

• Both the DETACH (RDLASTOP) and ROUTE (ROUTENT) routines in
  DFHZTSP have been changed so that the FMH option is only
  specified on the TC WRITE instruction when the Channel program
  (DFHAPCR) has not sent it.
  

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:

  UK37051 UK37052

Modules/Macros

•    DESAPCR  DFHAPCR  DFHZTSP
  

Fix information

• Fixed component name

  CICSTS V3 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R400 PSY UK37051

     UP08/06/06 P F806

• R500 PSY UK37052

     UP08/06/06 P F806

Fix is available

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