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PH00551: DFHFC0001 AN ABEND (CODE 0C4/AKEA) HAS OCCURRED AT OFFSET D7FA IN MODULE DFHFCVS TRANSACTION 18/07/25 PTF PECHANGE

A fix is available

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APAR status

  • Closed as program error.

Error description

  • You receive the following error messages in your CICS
    transaction server 5.2 region, that is running with
    storage protection and transaction isolation active:
    
    DFHFC0001 An abend (code 0C4/AKEA) has occurred at
              offset X'D7FA' in module DFHFCVS
    .
    DFHAC2236 Transaction xxxx abend AFCZ in program progxxxx
              term yyyy.
              Updates to local recoverable resources will be
              backed out.
    
    
    This message is repeated multiple times per second, until
    the region was recycled.
    The failing instruction is:
       L        R14,FREE_CHAIN_PTR(,@10)
    Due to R10 pointing to another task's storage, and with
    transaction isolation active, causes the program check.
    Additional Symptom(s) Search Keyword(s): KIXREVRJL
    abendafcz 0C4 traniso
    Program checks may also show up as:
    DFHFC0001 (CODE 0C4/AKEA) at offset X'DBD8' in module DFHFCFR.
    DFHFC0001 (CODE 0C4/AKEA) at offset X'5FCC' in module DFHFCRS.
    CDS instruction R2 Reg2 FCTDSBFP dfhfclms_to_free_chain
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All CICS users.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: FC0001 abend in DFHFCVS, accessing      *
    *                      task-level storage which belonged to    *
    *                      a previous task.                        *
    ****************************************************************
    A CICS transaction issues an EXEC CICS READ SET followed
    by an EXEC CICS READ UPDATE SET command. The task then
    abends. It enters HANDLE ABEND processing which issues an
    EXEC CICS SYNCPOINT ROLLBACK command.
    When DFHFCFR is called to prepare to backout, CICS puts the
    address of the task's File Control SET storage
    (which is task-level storage) into a File Control
    FC_BUFFER_BASE FCPH_CHAIN element (which is a chain of
    shared region-level storage). Later, another transaction takes
    the address from the FC_BUFFER_BASE FCPH_CHAIN and
    suffers an 0C4 abend.
    Additional Keywords: DFHFC0001 FC0001 FCSS SET
    FCB_256 FCB_512 FCB_1K  FCB_2K
    FCB_4K  FCB_8K  FCB_16K FCB_32K
    FCB_64K FCB_128 FCB_256 FCB_512
    FCB_1M  FCB_2M  FCB_4M  FCB_8M FCB_16M
    

Problem conclusion

  • UI56669  UI56670  UI56671  UI56672
    DFHFCFR has been changed to prevent it from putting task-level
    storage onto the region-level chain.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH00551

  • Reported component name

    CICS TS Z/OS V5

  • Reported component ID

    5655Y0400

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    YesPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-07-16

  • Closed date

    2018-08-28

  • Last modified date

    2019-08-07

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

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

    UI58121 UI58122 UI58123 UI58125

Modules/Macros

  • DFHFCFR
    

Fix information

  • Fixed component name

    CICS TS Z/OS V5

  • Fixed component ID

    5655Y0400

Applicable component levels

  • R000 PSY UI58125

       UP18/08/29 P F808 {

  • R100 PSY UI58123

       UP18/08/29 P F808 {

  • R800 PSY UI58121

       UP18/08/29 P F808 {

  • R900 PSY UI58122

       UP18/08/30 P F808 {

Fix is available

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Document Information

Modified date:
07 August 2019