PH36206: DFHSM0001 AN ABEND (CODE 0C4/AKEA) HAS OCCURRED AT OFFSET X'0C6A' IN MODULE DFHSMGF

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Customer got:
  DFHSM0001 An abend (code 0C4/AKEA) has occurred
  at offset X'0C6A' in module DFHSMGF
  
  The dump shows two tasks
  being attached at the same time.
  .Kernel Error data:
  Err_Num
  Err_Time KE_NUM Task Error Type Err_Code Module
  00000025
  16:33:05 03F9 86465 PROGRAM CHECK 0C4/AKEA DFHAPXM
  00000026
  16:33:05 00BF 86466 PROGRAM CHECK 0C4/AKEA DFHSMGF
  
  .Kernel
  summary data:
  KE_NUM Status TCA_Addr Tran# Tran ID DS_TASK
  KE_KTCB Error
  03F9 Not Running 1E9C5100 86466 CSXM 55023B00
  4B293000 *YES*
  00BF ***Running** 1E9C5100 86466 CSXM 54FDD380
  1E751200 *YES*
  
  .Application data:
  Tran Tran Orig TCA TWA EIB
  SEIB EIS EIUS
  No ID Tran Addr Addr Addr Addr Addr Addr
  86466
  £5QH £5QH 1E9C5100 00000000 20710100 1E9C5488 1E9C5388 20710008
  
  86466 CSXM CSXM 1E9C5100 00000000 20710100 1E9C5488 1E9C5388
  20710008
  

Local fix

• NA
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Two tasks attaching at the same time    *
  *                      obtain the same TCA address.            *
  ****************************************************************
  A Liberty Task is running on a T8 TCB and requires a transaction
  environment. This causes XMAT BUILD_TRANSACTION to be called to
  attach the transaction. This task obtains the XMATTLCK to
  serialise attach processing.
  
  At the same time another task requires a transaction environment
  to continue processing (for example the output of the US0200
  message for a user timing out).  This second task calls DFHXMXE
  GET_TXN_ENVIRONMENT which does not obtain XMATTLCK.
  
  This means two tasks can potentially obtain the same TCA address
  and this can lead to failures later in processing.
  

Problem conclusion

• DFHXMXE has been updated to obtain and release the XMATTLCK
  around the call to get_non_xm_resources.
  

Temporary fix

Comments

APAR Information

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

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

  UI75864

Modules/Macros

• DFHXMXE
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R200 PSY UI75864

     UP21/06/15 P F106

Fix is available

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