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PK52644: S0C4 IN DFHZLOC AT OFFSET 12B2 TRAN CLS1

A fix is available

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APAR status

  • Closed as program error.

Error description

  • DFHZCLS initiates CATD (label ZCLS_CATD_POS ) while DFHZGCN is
    waiting for the sessions to be unbound, causing the modegroup to
    be deleted beneath DFHZGCN's feet. When DFHZGCN wakes up out of
    its suspend, the value it has for TCATPTA is no longer valid, as
    it's been deleted already.
    Additional keywords:
    DFHZC0001 abend ASRA occurred at offset 852 in DFHZGCN.
    Also an ABEND0c4 in DFHZLOC offset 12B2.
    Failing instruction: CLI - 95D0 9004
    R9 contains ebcdic.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All CICS users.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: Abend 0C4 in DFHZLOC at offset x'12B2'  *
    *                      followed by ZC0001 abend from DFHZGCN   *
    *                      at offset x'852' when CNOS CLOSE ALL    *
    *                      MODENAME is received on a user session. *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    A CNOS CLOSE ALL MODENAME is received on a user session.
    After CNOSing to zero the subroutine CLOSE_SNASVCMG frees the
    user session before suspending itself for 1 second to allow the
    CLSDST of the other user sessions to occur.
    
    As this connection is marked for deletion when released
    (TCSE_IMPLICIT_DELETE) a CATD transaction is attached and
    deletes the connection, freemaining the storage used for the
    modegroups and sessions.
    
    When the CNOS task resumes from the 1 second delay it attempts
    to check for ACQuired sessions in the user modegroup but fails
    with an 0C4 in DFHZLOC at offset x'12B2' because the storage has
    been reused. After the 0C4 abend has been taken, the recovery
    routine in DFHZGCN produces a second abend, ZC0001.
    
    msgDFHAP0001 msgDFHZC0001 PROCESS_SESSION_LIMIT CLOSE_SNASVCMG
    CLS1 CLR1
    

Problem conclusion

  • The subroutine CLOSE_SNASVCMG in DFHZGCN has been amended to
    obtain the "TCT_NAMES.cccc" enqueue when it frees the user
    session, if the connection is due to be deleted when released
    (TCSE_IMPLICIT_DELETE).
    
    With the enqueue obtained CATD will not be able to start to
    delete the connection until the CNOS task completes.
    

Temporary fix

  • FIX AVAILABLE BY PTF ONLY
    

Comments

APAR Information

  • APAR number

    PK52644

  • Reported component name

    CICSTS V3 Z/OS

  • Reported component ID

    5655M1500

  • Reported release

    500

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2007-09-12

  • Closed date

    2007-10-03

  • Last modified date

    2008-05-28

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

    PK42456

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

    UK29746

Modules/Macros

  •    DFHZGCN
    

Fix information

  • Fixed component name

    CICSTS V3 Z/OS

  • Fixed component ID

    5655M1500

Applicable component levels

  • R500 PSY UK29746

       UP07/10/05 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.

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Document Information

Modified date:
28 May 2008