PI54437: DFHAP0001 APPLID AN ABEND (CODE 0C4/AKEA) HAS OCCURRED AT OFFSET X'000004BA' IN MODULE DFHZLRP

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• An 0C4 abend is reported against module DFHZLRP. After that,
  the region starts to take high CPU and users cannot login. The
  region has to be cancelled to restart and return service.
  .
  In reviewing a dump taken for the 0C4 abend, the task was still
  initializing when the abend occured as shown in the stack of
  the task:
  .
  DFHKETA
  DFHDSKE
  DFHXMTA
  DFHALXM
  INIT_XM_CLIENT
  DFHTFXM
  INIT_XM_CLIENT
  DFHZLRP
  DFHSRP
  DFHMEME
  SEND
  CONTINUE_SEND
  DFHDUDU
  SYSTEM_DUMP
  TAKE_SYSTEM_DUMP
  .
  CICS trace shows the following entries for the abend task:
  .
  TCP    AP D600 ALP   ENTRY TERM_AVAILABLE_FOR_QUEUE
         TERMINAL_TOKEN(1D291AB0)  <= TCTTE
  
  TCP    XM 1101 XMAT  ENTRY ATTACH TRANSACTION_ID(****)
         PRIMARY_CLIENT_TYPE(START_TERMINAL)
         PRIMARY_CLIENT_REQ_BLOCK(1D282880 ,00000094) <== AID
  
  TCP    XM 1102 XMAT  EXIT  ATTACH/OK     TRANNUM(0014388C)
  
  TCP    AP D601 ALP   EXIT  TERM_AVAILABLE_FOR_QUEUE/OK
  
  .
  XM     AP 0590 APXM  ENTRY INIT_XM_CLIENT
  
  14388  AP 0591 APXM  EXIT  INIT_XM_CLIENT/OK
  
  14388  AP 0651 ALXM  ENTRY INIT_XM_CLIENT
         CLIENT_REQUEST_BLOCK(1D282880 , 00000094)  <== AID
  
  
  14388  AP 1790 TFXM  ENTRY INIT_XM_CLIENT
         CLIENT_REQUEST_BLOCK(1CF85C00) <== TCTSE (should be
  TCTTE)
  14388  XM 1001 XMIQ  ENTRY SET_TRANSACTION
         FACILITY_TYPE(TERMINAL)
         FACILITY_TOKEN(1CF85C00) <== TCTSE (should be TCTTE)
  
  
  14388  XM 1002 XMIQ  EXIT  SET_TRANSACTION/OK
  
  14388  AP FD27 ZLRP  ENTRY LOGREC ID(DM01)
  
  14388  AP 0790 SRP   *EXC* PROGRAM_CHECK
  
  .
  The TCTTE address somehow has been replaced by a TCTSE address.
  The AID control block also contains a mismatch transaction ID
  at AIDTRNID.
  Additional Symptom(s) Search Keyword(s): KIXREVxxx 0C4 S0C4
  DFHZLRP high CPU abend program check TCTTE TCTSE AID
  

Local fix

• No
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: DFHAP0001 An abend (code 0C4/AKEA)      *
  *                      has occurred at offset X'000004BA' in   *
  *                      module DFHZLRP.                         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Two EXEC CICS START FROM requests are issued for the same
  TERMID and TRANSID and two PUT type AIDs are created.
  A task is attached for the first AID but the second task
  is suspended in DFHXMAT ATTACH, waiting for a GETMAIN.
  The first task issues two EXEC CICS RETRIEVE requests. The first
  RETRIEVE returns the data from the AID associated with the task.
  For the second request, DFHALP RETRIEVE_START_DATA scans the
  AID chain and finds the second PUT AID. Data is returned from
  this AID and it is unchained and a FREEMAIN issued for it.
  The freed storage is then reused for a third EXEC CICS START
  request.
  The second task attach then completes and processing continues,
  using the AID that is now associated with another task. This
  leads to the abend 0C4 in DFHZLRP.
  Additional keywords: S0C4 ABENDS0C4 MSGDFHAP0001 AP0001
  

Problem conclusion

• DFHALP RETRIEVE_START_DATA is changed so the scan of the AID
  chain ignores any that are flagged as being part way through
  DFHXMAT ATTACH processing.
  

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:

  PI56245 UI35486

Modules/Macros

• DFHALP
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R700 PSY UI35486

     UP16/02/25 P F602 ¢

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.