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

A fix is available

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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 number

    PM46674

  • Reported component name

    CICSTS FOR VSE

  • Reported component ID

    564805400

  • Reported release

    B0P

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-08-29

  • Closed date

    2011-11-17

  • Last modified date

    2012-05-15

  • 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.

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Document Information

Modified date:
15 May 2012