PM50151: ABEND0C4 ON CWBG TRANSACTION

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• On CWBG ABEND0C4 ABENDS0C4 S0C4 occured just after EXEC CICS
  ASSIGN command from DFHWBGB. During the ASSIGN command the CWBG
  was suspended on the SMLOCK. This allow other task to run and
  used the CSA registers save area. When the SMLOCK is obtained
  and the CWBG resumed, the registers were restore for the CSA and
  hence the abend 0C4. DFHWBGB register 13 should have point to
  DFHEIB control block before the EXEC CICS ASSIGN command was
  issued but instead was pointing to the CSA.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Message ABEND (CODE 0C4/AKEA) HAS       *
  *                      OCCURRED AT OFFSET X'FFFFFFFF'in        *
  *                      MODULE DFHWBGB is issued from           *
  *                      CWBG.                                   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  On entry to DFHWBGB register 13 point to the DSA storage.
  R13 is then set to point to the CSA before trace domain call.
  After that an EXEC CICS ASSIGN command is issued. Since R13
  point to the CSA. CSAOSRSA is used instead of the EXEC layer
  save area to save registers.
  During the ASSIGN command the task get suspended on the SMLOCK.
  Other tasks run and uses the CSA save area, CSAOSRSA. After
  SMLOCK is obtain and the ASSIGN command complete. The registers
  are restored from CSAOSRSA which now contain the registers
  value of the last task that used CSAOSRSA.
  In this case, R3 is changed to point to address in DFHFCNO
  which lead to execution branch to a wild address.This causes
  This causes DFHWBGB to abend 0C4.
  

Problem conclusion

• DFHWBGB is changed to make register 13 point to DFHEIB before
  EXEC CICScalls.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PM44358

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

  UK73418 UK73417

Modules/Macros

•    DFHWBGB
  

Fix information

• Fixed component name

  CICS TS Z/OS V4

• Fixed component ID

  5655S9700

Applicable component levels

• R600 PSY UK73417

     UP11/11/08 P F111

• R700 PSY UK73418

     UP11/11/08 P F111

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.