PH06592: ABEND0C4 IN DFHWBXN AT OFFSET 2508 FOLLOWING AN ABEND AKEC

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• You see the following messages on the console log:
  DFHWB0001  TESWMA5  An abend (code ---/AKEC) has occurred at
  offset X'FFFF' in module DFHWBSR.
  DFHAP0001  TESWMA5  An abend (code 0C4/AKEA) has occurred at
  offset X'00002508' in module DFHWBXN.
  .
  The abendAKEC is a runaway timeout that you know is caused by
  CICS using lots of CPU to process a very large ( many Megabytes
  ) chunked receive.  The abend0C4 in DFHWBXN, in the aftermath
  of the AKEC , is unexpected and should not happen.
  .
  The abend0C4 is happening because DFHWBXN's recovery routine
  (which got control because of the AKEC) is trying to use
  WRB_PTR but that has not been setup yet.
  
  Additional Symptom(s) Search Keyword(s): KIXREVDWZ
  

Local fix

• Increase ICVR so that the abendAKEC never happens
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend 0C4 in module DFHWBXN following a *
  *                      runaway condition (abend AKEC) detected *
  *                      in DFHWBSR RECEIVE processing.          *
  ****************************************************************
  CICS is set up to receive HTTP requests.  A very large request
  (several MB in size) is sent to CICS in many small chunks.
  
  A CWXN task is attached to receive the chunks and reconstruct
  the HTTP request. Due to the large number of chunks involved,
  the CWXN task is able to run continually on the SO TCB until the
  ICVR limit is reached. At this point the task is abended AICA.
  
  The DFHWBSR recovery routine gets control and returns to DFHWBXN
  without providing the address of the web request block (WRB).
  As part of the error processing DFHWBXN attempts to update
  fields within the WRB and suffers an ABEND0C4.
  
  Additional keywords:
  S0C4  ABENDS0C4  ABENDAKEC  ABENDAICA
  

Problem conclusion

• DFHWBXN has been updated to ensure it correctly addresses the
  web request block following a severe error in DFHWBSR.
  

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:

  UI61660 UI61661

Modules/Macros

• DFHWBXN
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R100 PSY UI61661

     UP19/03/06 P F903

• R200 PSY UI61660

     UP19/03/06 P F903

Fix is available

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