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PI16377: ABEND0C4 RC00000038 IN DSNLXREL+0330 DUE TO OVERLAY IN EDMPOOL, AND DB2 TERMINATES WITH RC00D94001 14/04/25 PTF PECHANGE

A fix is available

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APAR status

  • Closed as program error.

Error description

  • ABND=0C4-00000038 in DSNLXGLM.DSNLXREL+0330 and DB2 got abnormal
    termination with 00D94001.
    
    After APAR PM94696, there may be a potential serialization
    issue when RDS sections are allocated in EDM pool, this creates
    a small time window that different threads may obtain the same
    block and causes overlay problem.
    
    Other possible abends after applying PI09147:
    ABEND04E RC00E70005 AT DSNXACIN OFFSET07CA
    ABEND04E RC00C90101 AT DSNGESFR location 5003
    
    
    Additional keyword: DB2OVRLAY/K SMCOVERLAY
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All DB2 users of plan authorization cache    *
    ****************************************************************
    * PROBLEM DESCRIPTION: There could be an overlay in SKCT       *
    *                      EDMPOOL. The corrupted SKCT causes      *
    *                      variable ABENDs                         *
    *                                                              *
    *                      ABEND0C4 RC00000038 IN DSNLXREL+0330    *
    *                      ABEND04E RC00E70005 DSNXELX :M124       *
    *                                                              *
    *                      which is followed by                    *
    *                      DB2 TERMINATES WITH 00D94001.           *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    After applying PTF UK98135/UK98136 (PM94696), with plan
    authorization cache, there could be a small timing window
    where the same SKCT pool storage could be allocated to two
    different internal control block. When this happens, the above
    abend could be received.
    
    The plan authorization cache can be disabled with
    BIND option CACHESIZE(0).
    

Problem conclusion

  • DB2 code has been changed to fix the above timing window.
    

Temporary fix

  • *********
    * HIPER *
    *********
    

Comments

APAR Information

  • APAR number

    PI16377

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    A10

  • Status

    CLOSED PER

  • PE

    YesPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-04-20

  • Closed date

    2014-05-13

  • Last modified date

    2015-03-12

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

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

    UI17928 UI17929 UI17930

Modules/Macros

  • DSNGEGSK
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • RA10 PSY UI17929

       UP14/05/30 P F405 ®

  • RB10 PSY UI17930

       UP14/05/30 P F405 ®

  • R910 PSY UI17928

       UP14/06/06 P F406 ®

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:
12 March 2015