PK61299: DFHSM0131 CICS IS UNDER STRESS CAUSED BY WBSETBUF GETMAINED AND NEVER FREEMAINED .

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CICS TS V3.1 is acting as the client and is sending messages
  to the server in a continuous flow.  The following sequence is
  constantly repeated in a long running transaction:
  1. EXEC CICS WEB OPEN
  2. EXEC CICS WEB SEND
  3. EXEC CICS WEB RECEIVE
  4. EXEC CICS WEB CLOSE
  The server address is always the same. Customer has run tests by
  sending 1000 consecutive messages to the server.
  Without SSL everything works fine, but when using SSL the SOS
  condition is raised after 180 messages.
  It looks as if some SSL related data is filling the storage.
  From TRACE repated 8K areas are getmained for WBSETBUF to
  satisfy a WEB_OPEN request, but never freed.
  WBSETBUF is getmained by DFHWBCL (lvl PK56688) x'40DE' at
  label wbcl_return_response_body .
  This problem has been fixed by development in CICS TS 3.2.  The
  WBSETBUF should be freemained during WEB CLOSE processing.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All.                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: EXEC CICS WEB-RECEIVE SET buffer is     *
  *                      incorrectly freed during EXEC CICS WEB  *
  *                      CLOSE.                                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  In the CICS Transaction Server for z/OS, CICS Application
  Programming  Reference manual ( SC34-6434-05 ) section 1.294,
  the description for WEB RECEIVE (Client) option SET(ptr-ref)
  states 'The pointer reference is valid until the next receive
  command or the end of task.'
  In fact the SET buffer is being incorrectly freed as part of
  EXEC CICS WEB CLOSE processing.
  
  Additional Keywords : WBSETBUF
  

Problem conclusion

• DFHWBCL has been changed to no longer freemain the Set buffer
  ( WBSETBUF ) at EXEC CICS WEB CLOSE.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

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

  UK35890

Modules/Macros

•    DESWBCL  DFHWBCL
  

Fix information

• Fixed component name

  CICSTS V3 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R500 PSY UK35890

     UP08/04/30 P F804

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.