PK53253: RECEIVING DFHWB0001 CODE 0C4/AKEA AT OFFSET X'3F4' IN MODULE DFHWBXM FOR TRANSACTION CSAC, DUE TO BAD CLIENT REQUEST BLOCK.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CSAC gets run in place of the alias task when the alias is
  disabled.  This still goes through WBXM for INIT_XM_CLIENT
  processing.  This references fields in the wrb (which is the
  client attach block).  One of those is wrb_userid.  In the
  failing case the userid picked out of the reused storage is
  unknown to RACF so you get the error.
  .
  CSAC should not be attempting to reference the wrb which will
  have already been freemained by DFHWBXN.
  .
  You may see some of the following Trace Entries when this
  problem occurs:
  .
  1102 XMAT  EXIT - FUNCTION(ATTACH) RESPONSE(EXCEPTION)
                    REASON(DISABLED) TRANNUM(0012345C)
  .
  451C WBXN  *EXC* - ATTACH_ALIAS_ERROR
  .
  0600 WBXM  ENTRY - FUNCTION(INIT_XM_CLIENT) CLIENT_REQUEST
                     _BLOCK(2DE63030 , 00000360)
  .
  0604 WBXM  *EXC* - RECOVERY_ENTERED FUNCTION(INIT_XM_CLIENT)
                     CLIENT_REQUEST_BLOCK(2DE63030 , 00000360)
  .
  This is due to another TASK owning the piece of Storage that
  2DE63030 is now a part of.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS Users                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: If the Web alias transaction CWBA or    *
  *                      its replacement (as specified in a      *
  *                      URIMAP or Analyzer program) is          *
  *                      disabled, unpredictable errors occur    *
  *                      in the INIT_XM_CLIENT function of       *
  *                      DFHWBXM.                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  If the attach of Web alias transaction by CWXN fails because the
  alias is disabled, CWXN abends with code AWB2 and the Web
  Primary Client Request Block (WRB) is freemained during abend in
  Webrequest_tidyup. Meanwhile the failing attached task continues
  as transaction CSAC and references the freed WRB in DFHWBXM
  INIT_XM_CLIENT. The CSAC task eventually suffers a 0C4 abend
  because it references fields in the freed WRB that have since
  been overlaid.
  
  Additional keywords:
  DFHWB0001 msgDFHWB0001 WB0001 ABEND0C4 ABENDS0C4 S0C4  ABENDAWB2
  

Problem conclusion

• The DFHWBXM INIT_XM_CLIENT function has been modified to take no
  action if it is running for transaction CSAC, and it no longer
  references the freed WRB.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

  PK48781

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

  UK30623

Modules/Macros

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

Fix information

• Fixed component name

  CICSTS V3 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R500 PSY UK30623

     UP07/10/31 P F710

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.