PM46674: DFHSO0002 (CODE X'0211') DFHSO0102 (CODE X'0263') FOLLOWED BY DFHSO0001 (CODE 0C4/AKEA) AT X'57EE' IN DFHSOCK

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Customer is experiencing a series of abends. Starting with
  DFHSO0002 A SEVERE ERROR (CODE X'0211') HAS OCCURRED in
  MODULE DFHSOCK, then followed by
  DFHSO0102 ERROR (CODE X'0263') HAS OCCURRED ON RECEIPT
  OF A SEVERE TCP/IP RETURN CODE; THE TCPIPSERVICE xxxxxxxx
  ON PORT nn AT IP ADDRESS xxx.xxx.xxx.xxx WILL BE CLOSED.
  Followed by
  DFHSO0001AN ABEND (CODE 0C4/AKEA) HAS OCCURRED at OFFSET
  X'57EE' IN MODULE DFHSOCK
  After message DFHSO0102 is issued, the TCP/IP service on
  port nn is taken down. Restart TCP/IP region and the closed
  TCPIPSERVICE is reopened. The normal work can't be resumed
  on the TCPIPSERVICE. Customer has to take both CICS and
  TCP/IP down and up to get it work again.
  It appears that CICS should not be issuing an ACCEPT if it
  has closed the TCPIPSERVICE. If CICS did so, then when TCP/IP
  decided to respond to the bad ACCEPT a bit later, and the bad
  LTE address could cause the S0C4.
  Customer's VSE version is at 820/4.2 and TCPIP version is at
  IBM APAR PK33472 (SP F).
  Additional Keywords: KIXREVRHC
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: DFHSO0001 An abend (code 0C4/AKEA) has  *
  *                      occurred at offset X'57EE' in module    *
  *                      DFHSOCK after enabling TCP/IP option    *
  *                      $OPTCHKR.                               *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  This error normally occurs when the customer has enabled the
  BSDCFG2=$OPTCHKR option in the TCP/IP SOCKOPT macro.
  
  After an EOPNOTSUPP (1,112) error on an ACCEPT call for a
  TCPIPSERVICE, CICS is supposed to perform an immediate close on
  the TCPIPSERVICE, which it does.
  
  However, a CICS logic error causes it to incorrectly issue a
  new ACCEPT on the TCPIPSERVICE, and it passes a bad parameter
  address.
  
  If TCP/IP does not reject this request, the later completion of
  the request causes CICS to use the bad parameter address, and it
  attempts to overlay the key zero storage that is addressed by
  GPR 11 when executing a STORE R9 instruction. This results in
  the protection exception S0C4 program check in DFHSOCK.
  
  The customer may see other error messages and abends before
  this one due to the EOPNOTSUPP, for example:
  
  DFHSO0002 A SEVERE ERROR (CODE X'0211') HAS OCCURRED IN MODULE
  DFHSOCK
  
  DFHSO0102 A LANGUAGE ENVIRONMENT CALLABLE SERVICE ERROR (CODE
  X'0263') HAS OCCURRED ON RECEIPT OF A SEVERE TCP/IP RETURN CODE;
  
  Additional keywords: ABEND0C4 ABENDS0C4 MSGDFHSO0001
                       MSGDFHSO0002 MSGDFHSO0102
  

Problem conclusion

• DFHSOCK has been corrected so that it no longer issues another
  ACCEPT request on the TCPIPSERVICE as it is being closed.
  
  In addition, DFHSOCK has been corrected to avoid an overlength
  trace entry SO 0263 that may occur for this problem.
  

Temporary fix

•             *********
              * HIPER *
              *********
  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:

  UK73939

Modules/Macros

•    DESSOCK  DESSOCM  DESSOSE  DFHSOCK  DFHSOSE
  

Fix information

• Fixed component name

  CICSTS FOR VSE

• Fixed component ID

  564805400

Applicable component levels

• RB0P PSY UK73939

     UP11/11/28 P E511

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.