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PM50560: ABEND04E RC00E50002 FROM DSNSRSUP AFTER AN ABEND04E RC00E20016 FROM DSNSVSTK

A fix is available

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APAR status

  • Closed as program error.

Error description

  • ABEND04E RC00E50002 from DSNSRSUP after an ABEND04E RC00E20016
    from DSNSVSTK.
    .
    If there are multiple SMC RECOVERY STACKs allocated, this
    problem is possible and results in a recovery failure.
    DB2 terminates with DSNV086E RC00E50727
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of DB2.                            *
    ****************************************************************
    * PROBLEM DESCRIPTION: Following an ABEND04E RC00E20016 due    *
    *                      to a short on DBM1 storage situation,   *
    *                      a secondary ABEND04E RC00E50002         *
    *                      occurred during latch manager recovery  *
    *                      causing DB2 to terminate with           *
    *                      RC00E50727.                             *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    DB2 was running short on DBM1 virtual storage resulting in
    many storage abends (ie. ABEND04E RC00E20003 RC00E20016 etc).
    One thread had requested storage from a storage pool and
    DSNSVBK had invoked storage contraction in an attempt to
    free up unused storage.  While holding an LPVT latch,
    DSNSCON2 was attempting to release a PHB latch and received
    an ABEND04E RC00E20016 in DSNSVBK when resuming a latch
    waiter.  Due to the nested storage manager requests,
    abend recovery made two passes through recovery routine
    DSNSRSUP.  The LPVT latch was released on the first pass,
    but a latch tracking flag was not reset.  This caused the
    second pass to attempt to release the LPVT latch a second
    time which failed with ABEND04E RC00E50002 as the latch
    was not held.  This secondary abend during recovery caused
    DB2 to terminate with RC00E50727.
    

Problem conclusion

  • DSNSRSUP has been changed to reset the latch held tracking
    flag when a latch is released in case a second or subsequent
    pass is made through the recovery routine.  This APAR does not
    address the virtual storage shortage issue.
    

Temporary fix

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

Comments

APAR Information

  • APAR number

    PM50560

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    810

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-10-20

  • Closed date

    2011-11-02

  • Last modified date

    2011-12-02

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

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

    UK73473 UK73474 UK73475

Modules/Macros

  • DSNSRSUP
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • RA10 PSY UK73473

       UP11/11/18 P F111

  • R810 PSY UK73474

       UP11/11/18 P F111

  • R910 PSY UK73475

       UP11/11/18 P F111

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 December 2011