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PM17827: ABEND04E RC00E2000E FROM DSNVGACE DSNSFBK OFFSET11B6 CAUSED DB2 TO CRASH WITH RC00E50705 DB2OVRLAY/K

A fix is available

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APAR status

  • Closed as program error.

Error description

  • ABEND04E RC00E2000E from DSNVGACE DSNSFBK OFFSET11B6
    caused DB2 to crash with RC00E50705
    .
    In this customer's case CICS was shutting down.
    It is possible to overlay FREE keyword for the fixed storage
    block as ACECHNA was pointing to the wrong place.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All CICS users of DB2.                       *
    ****************************************************************
    * PROBLEM DESCRIPTION: ABEND04E RC00E2000E in DSNSFBK after    *
    *                      shutting down the DB2 threads from a    *
    *                      CICS region when there were multiple    *
    *                      dissociated threads in the CICS         *
    *                      address space.  Depending on where      *
    *                      the abend occurs, DB2 may terminate     *
    *                      with RC00E50705.                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    When the CICS commit coordinator thread terminates, DSN3ID80
    will queue any dissociated threads left behind for termination.
    DSN3ID80 will take the ACEs off the VLCA chain but the ACEPACE
    pointer is not reset.  This can cause the 'FREE' character
    string in a free ACE to be overlaid with zeros due to the
    residual ACEPACE pointer.  When the overlaid ACE is later taken
    off the free chain, it will fail the validity check and result
    in an ABEND04E RC00E2000E in DSNSFBK.  SMCOVERLAY
    

Problem conclusion

  • The ACE de-chaining code in DSN3ID80 has been corrected.
    

Temporary fix

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

Comments

APAR Information

  • APAR number

    PM17827

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    910

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-07-02

  • Closed date

    2010-07-16

  • Last modified date

    2011-02-19

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

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

    UK58879 UK58880

Modules/Macros

  • DSN3ID80
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • R810 PSY UK58879

       UP10/07/31 P F007

  • R910 PSY UK58880

       UP10/07/31 P F007

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:
19 February 2011