PI08038: ASOD ABENDS FOR CWXN

Obtain the fix for this APAR.

APAR status

• Closed as unreproducible.

Error description

• You received a series of ASOD abends.
  .
  Before CWXN task is attached by CSOL, the client has already
  disconnected. CICS trace shows SOUS  *EXC* GETSOCKNAME_FAILURE
  RETURN_VALUE(-1) RETURN_CODE(1124) REASON_CODE(749B0000).
  In this siutation, the CWXN task will always abend ASOD.
  The purpose of this apar is to prevent CWXN even being attached
  in this case. That will pevent the majority of the ASOD abends.
  .
  The stack for this CWXN:
      DFHKETA
      DFHDSKE
      DFHXMTA
      ABEND_TRANSACTION
      DFHXMER
      DFHPGPG
      INITIAL_LINK
      DFHAPLI1
      CICS_INTERFACE
      DFHPCP
      DFHABAB
      TRANSACTION_DUMP_ROUTINE
      DFHDUDU
      TRANSACTION_DUMP
      TAKE_SYSTEM_DUMP
  .
  Note that a window will still exist between CWXN being attached
  and DFHSOXM being run during task initialization.  If the client
  disconnects in that gap then CWXN will continue to abend ASOD.
  .
  Additional Symptom(s) Search Keyword(s): KIXREVSVR
  ABENDASOD
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Transaction CWXN abends ASOD.           *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A client is sending a TCPIP request to CICS. Transaction CWXN
  is used. Before CICS attaches CWXN, the TCPIP connection is
  dropped and the client is disconnected. In the trace, a
  GETSOCKNAME_FAILURE exception is issued. However CICS still
  attaches transaction CWXN after it issues this exception. After
  CWXN is attached, because the client is still disconnected,
  CICS issues the GETSOCKNAME_FAILURE exception again and this
  time it causes CWXN to abend ASOD.
  
  Additional keywords: DFHAC2236 DFHSO0108 msgDFHAC2236
  msgDFHSO0108 abendASOD PM58300
  

Problem conclusion

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

• CICS is changed so that before it attaches CWXN, it checks the
  TCPIP connection to the client. If the connection is gone and
  the client is disconnected, CICS will not attach CWXN.
  

APAR Information

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

  PM68178

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

  UI15011

Modules/Macros

•    DFHWBSO
  

Fix information

• Fixed component name

  CICSTS V3 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R500 PSY UI15011

     UP14/02/20 P F402

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.