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PM86461: DFHFC0001 0C4 ABEND IN IAMCOMPO DUE TO THE RPLAREA BEING ZEROES

A fix is available

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APAR status

  • Closed as program error.

Error description

  • The DFHFC0001 dump is taken as a result of an 0C4 in IAM module
    IAMCOMPO + x'0A26'. The cause of the 0C4 is that field RPLAREA
    (or VSWAREA) is zeroes when a GET request is issued against a
    file with an alternate index. The RPLAREA (VSWAREA) should be
    set up from FRT_DATA_BUFFER in DFHFCVS. However, it does not
    appear that DFHFCVS has properly set up FRT_DATA_BUFFER prior
    to the call to proc ACCMTEST and subsequent call to DFHFCDTS.
    At the time the dump is taken, there is an ongoing browse in
    progress, and CICS has determined that the browse needs to be
    repositioned in order to satisfy the current READ PREVIOUS
    request. During the reposition, we test to see if the key is
    all x'FF's. In this case it is, and we issue a READ NEXT SET
    command to help position the browse pointer correctly. The
    original user request was for a READ PREVIOUS INTO, so no SET
    storage area is available (this is normally addressed from
    FRT_DATA_BUFFER, but is only initialised for a SET command.)
    Herein lies the problem.
    During a READPREV INTO, CICS has issued an extra READNEXT SET,
    in order to reposition the browse. Nothing has been set up in
    the FRT_DATA_BUFFER address, so when the request ultimately
    gets into the file manager system (VSAM/IAM) the RPLAREA
    contains zeros, and we get the 0C4 in IAMCOMPO.
    Additional Symptom(s) Search Keyword(s): FOR , AOR, HANG,
    FC0001, S0C4, IAM, KIXREVJJW
    

Local fix

  • n/a
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All CICS users.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: An abend S0C4 occurs during a READPREV  *
    *                      INTO request against a CICS maintained  *
    *                      data table.                             *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    An abend 0C4 occured during a READPREV INTO for a CICS
    maintained data table. In the reported instance of the
    problem, the file system being used was IAM.
    The S0C4 occured at offset x'0A26' in module IAMCOMPO.
    The problem also occurs using VSAM, in which case it is
    reported at offset x'FFFF' in DFHFCVR.
    .
    During a BROWSE operation, a READPREV INTO was issued for a
    record, with a key of all x'FF's. CICS determined that the
    browse needed to be repositioned. An attempt to read from the
    data table was made, but returned a DTP_EXCEPTION for reason
    DTP_NOT_IN_TABLE.
    This caused SOURCE_BROWSE_REPOSITION to be driven. Because the
    key was FFF..., it is necessary to issue an intervening READNEXT
    SET. The original request was an READPREV INTO, which meant that
    no SET storage had ever been created. On the call to VSAM/IAM,
    the RPLAREA passed was all zeros, leading to the 0C4.
    .
    The user transaction is abended AFCZ.
    .
    Additional Keywords: abendS0C4 abend0C4 abendAFCZ
    

Problem conclusion

  • DFHFCDTS has been changed to ensure that SET storage is
    initialised prior to the intervening READNEXT SET.
    

Temporary fix

  • FIX AVAILABLE BY PTF ONLY
    

Comments

APAR Information

  • APAR number

    PM86461

  • Reported component name

    CICS TS Z/OS V4

  • Reported component ID

    5655S9700

  • Reported release

    600

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-04-05

  • Closed date

    2013-07-01

  • Last modified date

    2013-08-02

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

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

    PM86711 UK95609 UK95610

Modules/Macros

  •    DFHFCDTS
    

Fix information

  • Fixed component name

    CICS TS Z/OS V4

  • Fixed component ID

    5655S9700

Applicable component levels

  • R600 PSY UK95609

       UP13/07/13 P F307

  • R700 PSY UK95610

       UP13/07/13 P F307

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:
02 August 2013