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PK62921: AN ABEND0C4 OCCURS IN DFHFCFS. THE PSW IS IN 24 BIT MODE, BUT DFHFCFS IS IN 31 BIT MODE AND RESIDES ABOVE THE LINE.

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APAR status

  • Closed as program error.

Error description

  • After migrating to CICS TS R3.2, an abend0C4 occurs with
    DFHFCFS in control.  The PSW address is in 24 bit mode, but
    DFHFCFS resides above the line.  Control just left DFHFCFR and
    due to an overlay in the File Control Static area, FCS, an
    incomplete address was picked up for DFHFCFS and the program
    check occurred.
      Just above the FCS, there were File Control Table Entries for
    BDAM files.  These entries are x'A8' in length, while VSAM FCTEs
    are x'1D8' in length.  DFHFCFS has updated some threadsafe
    fields in the FCTE for the file being opened.  These fields are
    beyond the x'A8' length in the BDAM FCTE, and a bit was turned
    off beyond the end of the FCTE control block.  This caused an
    overlay in the FCS that resided just below the BDAM FCTE.
      Before updating new threadsafe fields in the FCTEs, we need to
    check if the file is VSAM or BDAM.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All.                                         *
    ****************************************************************
    * PROBLEM DESCRIPTION: DFHFC0001 "An abend (code 0C4/AKEA) has *
    *                      occured at offset X'FFFF' in module     *
    *                      DFHFCVS" after an open of a BDAM file.  *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    During open processing for a BDAM file, DFHFCFS sets off an
    indicator bit (FCT_THREADSAFE_WORK) in the VSAM extension of the
    FCT. However FCT entries for BDAM files do not have a VSAM
    extension, so this results in an overlay of storage beyond the
    FCT entry. In this case the field that was corrupted was the
    x'80' bit in the top byte of the address of DFHFCVS in FCSTATIC
    storage. This resulted in the reported abend0C4 when DFHFCVR was
    later called via this address, because it was called in 24 bit
    mode instead of 31 bit, however other unpredictable results may
    occur.
    
    Additional Keywords: S0C4 abendS0C4 msgDFHFC0001 FC0001
                         abendASRA ASRA 0C4
    

Problem conclusion

  • DFHFCFS has been altered so that the bit corresponding to
    FCT_THREADSAFE_WORK is not set off for BDAM files.
    

Temporary fix

  •             *********
                * HIPER *
                *********
    FIX AVAILABLE BY PTF ONLY
    

Comments

APAR Information

  • APAR number

    PK62921

  • Reported component name

    CICSTS V3 Z/OS

  • Reported component ID

    5655M1500

  • Reported release

    500

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2008-03-18

  • Closed date

    2008-04-28

  • Last modified date

    2008-05-02

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

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

    UK35923

Modules/Macros

  •    DFHFCFS
    

Fix information

  • Fixed component name

    CICSTS V3 Z/OS

  • Fixed component ID

    5655M1500

Applicable component levels

  • R500 PSY UK35923

       UP08/04/30 P F804

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 May 2008