PK51372: DFHWB0002 CODE 0505 FROM DFHWBSR POSSIBLE IF A TCPIPSERVICE IS CLOSED IMMEDIATE, UNKNOWN_SESSION_TOKEN IN TRACE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• A CWXN task has managed to complete transaction initialization,
  and then starts WEBREQUEST_RECEIVE processing.  During that
  processing, it gets suspended.  While it is suspended, another
  task has issued a SET TCPIPSERVICE CLOSE IMMEDIATE, and manages
  to have the CSOL task process the immediate close before the
  first task completes the WEBREQUEST_RECEIVE processing.
  When the first task resumes processing, the token it had
  previously inquired on is now invalid because it has been
  deleted by the CLOSE IMMEDIATE processing.  The task will
  receive a RESPONSE(EXCEPTION) REASON(UNKNOWN_SESSION_TOKEN)
  exception and produce a WB0002 dump with code x'0505'.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All.                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: DFHWB0002 A severe error (code X'0505') *
  *                      has occurred in module DFHWBSR          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A web request is received which causes CWXN transaction to be
  started. CWXN loses control during initialisation and before
  regaining control, its socket gets deleted because the
  TCPIPService has an IMMCLOSE issued against it. When CWXN
  regains control, it calls webrequest_receive which eventually
  issues a socket inquire. The inquire gets an exception response
  with reason unknown_session_token. This reason is not handled by
  DFHWBSR so the default action of system dump with message
  DFHWB0002 is taken.
  Additional keywords: msgDFHWB0002 0505
  

Problem conclusion

• DFHWBSR has been altered so it checks for the reason code
  sois_unknown_session_token and sets wrq_connection_closed
  when it is returned.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PK46918

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

  UK29116

Modules/Macros

•    DESWBAP  DESWBDM  DESWBRQ  DESWBSR  DESWBXM
  DFHWBAP  DFHWBAPF DFHWBDM  DFHWBRQS DFHWBSR  DFHWBXM
  

Fix information

• Fixed component name

  CICSTS V3 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R500 PSY UK29116

     UP07/09/21 P F709

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.