PI96810: MIGRATED TO CICS TS 5.4 AND NOW GETTING SM0002, RM0001, MN0002, AND WB0002.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Migrated to CICS TS 5.4, started volume testing the regions
  which started getting SM0002, WB0002, RM0001, and MN0002
  abends.  Several WB Domain control blocks are overlaid.
  .
  Looking at the Web Domain the following overlays appear.
  .
  4040404040404040    40404  ??????  ???????  4040:4040:4040:4040:
  ** DFHPD0105  A loop has been detected. WBO at address 40404040
  .
  WBOX-R 40404040 WBO Realm extension
  .
     0000  40404040 40404040 40404040 40404040
     0010  40404040 40404040 40404040 40404040
     0020 -    403F LINES SAME AS ABOVE
  .
   WBO 40404040 Web Outbound Session
  .
      0000  40404040 40404040 40404040 40404040
      0010  40404040 40404040 40404040 40404040
      0020 -    023F LINES SAME AS ABOVE
      0240  40404040 40404040
  .
   HOSTNAME 40404040 Web Outbound Session Hostname
  .
  ** DFHPD0101  Pointer to HOSTNAME at offset 0000 is invalid.
  .
   PROXY 40404040 Web Outbound Session Proxy
  .
  ** DFHPD0101  Pointer to PROXY at offset 0000 is invalid.
  .
   PATH 40404040 Web Outbound Session Path
  .
  ** DFHPD0101  Pointer to PATH at offset 0000 is invalid.
  .
    WBOX-R 40404040 WBO Realm extension
  .
       0000  40404040 40404040 40404040 40404040
       0010  40404040 40404040 40404040 40404040
       0020 -    403F LINES SAME AS ABOVE
  .
    WORKBUF 40404040 Web Outbound Work Buffer
  .
   ** DFHPD0101  Pointer to WORKBUF at offset 0000 is invalid.
  .
    PEEKBUF 40404040 Web Outbound Peek Buffer
  .
   ** DFHPD0101  Pointer to PEEKBUF at offset 0000 is invalid.
  .
    SENDBUF 40404040 Web Outbound Send Header Buffer
  .
   ** DFHPD0101  Pointer to SENDBUF at offset 0000 is invalid.
  .
    DISCBUF 40404040 Web Outbound Discard Buffer
  .
   ** DFHPD0101  Pointer to DISCBUF at offset 0000 is invalid.
  
  ** DFHPD0105  A loop has been detected. WBO at address 40404040
                already encountered.
  .
  .
  Socket QPH Storage.
  .
  QPH.SOCKET 4A9EB000 Quickcell Page Header
  .
     0000  40404040 40404040 40404040 40404040
     0010  40404040 40404040 40404040 40404040
     0020  40404040 40404040 40404040 40404040
  .
  QPH.SOCKET 40404040 Quickcell Page Header
  .
     0000  40404040 40404040 40404040 40404040
     0010  40404040 40404040 40404040 40404040
     0020  40404040 40404040 40404040 40404040
  .
  * DFHPD0105  A loop has been detected. QPH at
               address 40404040 already encountered.
  .
  The problem is caused by a compiler issue in DFHWBCL.  While
  initializing a buffer used to build the request headers an
  extra 256 bytes are being set to blanks (x'40') if the buffer
  length is a multiple of 256 plus 1 (e.g. 257, 513).  This
  causes the storage overlay.
  .
  Additional Symptom(s) Search Keyword(s): KIXREVPAD
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Storage overlays when making outbound   *
  *                      HTTP requests.                          *
  ****************************************************************
  * RECOMMENDATION: .                                            *
  ****************************************************************
  A CICS application is using the EXEC CICS WEB API to make
  outbound HTTP requests.  When DFHWBCL builds the HTTP request it
  uses an area of storage in the WBOUTBND subpool.  It is possible
  for certain lengths of HTTP headers to cause DFHWBCL to overlay
  storage past the end of this storage area with x'40's.
  
  The effect of the overlay depends on which subpool owns the page
  that follows the WBOUTBND page in memory.  It is possible to
  observe DFHSM0002, DFHSO0002, DFHWB0002, DFHMN0002 and even
  DFHRM0001 and termination of the CICS region.
  
  Additional Keywords: SM0002 WB0002 RM0001 MN0002
                       MSGDFHSM0002 MSGDFHWB0002
                       MSGDFHRM0001 MSGDFHMN0002
  

Problem conclusion

• DFHWBCL has been changed to no longer cause a storage overlay
  when building the HTTP request.
  

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:

  UI55736

Modules/Macros

• DFHWBCL
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R100 PSY UI55736

     UP18/06/04 P F805 ¢

Fix is available

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