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PI14647: ABEND04E RC00E20006 AT DSNJB006 DSNSVBK FROM FREEING STORAGE.

A fix is available

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APAR status

  • Closed as program error.

Error description

  • ABEND04E RC00E20006 at DSNJB006 DSNSFSTG when freeing storage.
    The abending service task is SSCEVN00. The storage pool is
    LOG MGR VAR LNGTH POOL and the block to be freed is RPLAREA.
    Storage manager discovered this block is already free.
    The problem is in DB2 11 for z/OS.
    
    Keywords: ExtendedRBA DB2EXTRBA/K
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of DB2 for zOS Version 11 that     *
    *                 have not converted the BSDS data sets        *
    *                 to the 10-byte RBA format with DSNJCNVT.     *
    ****************************************************************
    * PROBLEM DESCRIPTION: ABEND04E RC00E20006 in DSNSVBK as       *
    *                      DSNJB006 was attempting to free         *
    *                      buffer storage that was already         *
    *                      free.                                   *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    BSDS updates were being done as the result of an SCA rebuild
    request.  When the BSDS data sets have not been converted to
    the 10-byte format, some records must be converted to the
    pre-version 11 format before they are written to the BSDS.
    The conversion buffer may be freed, and the pointer to the
    buffer cleared, without holding the correct latch.  This can
    result in the wrong buffer being freed and various other
    problems in the BSDS update routines when the pointer to the
    conversion buffer gets cleared and there are multiple BSDS
    update requests being processed.  In the failing case, DSNJB006
    attempted to free buffer storage that was already free, which
    resulted in an ABEND04E RC00E20006.  Depending on the timing of
    the BSDS update requests, and storage requests from the LOG
    MGR VAR LNGTH POOL, there could be a possible storage overlay
    in the LOG MGR VAR LNGTH POOL. LMBVPHDR LMBVPHDRjr DB2OVRLAY/K
    

Problem conclusion

  • DSNJB002 has been changed so that the pointer to the conversion
    buffer will only be updated while holding the BSDS latch.
    

Temporary fix

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

Comments

APAR Information

  • APAR number

    PI14647

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    B10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-03-27

  • Closed date

    2014-04-17

  • Last modified date

    2014-11-12

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

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

    UI17152

Modules/Macros

  • DSNJB002
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • RB10 PSY UI17152

       UP14/05/02 P F405 ½

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 November 2014