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PI92571: ABEND04E RC00E3000E DSNSVSFB +08A2 FOLLOWING AN ABEND13E PER LOGREC

A fix is available

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APAR status

  • Closed as program error.

Error description

  • An ABEND13E occurred for a connected user while the instruction
    at DSNVEUS1 +446 was being executed.  The ABEND13E caused the
    CCB control block to be freed, but DSNVEUS1 was in the middle of
    manipulating it.  This is a very rare timing window that has
    existed from the beginning when this code was written and its
    chance of occurring again are very rare.
    **************************************************************
    Additional Symptoms and Keywords:
     ABEND04E AB04E S004E 04E
      04E-00E2000E 00E2000E RC00E2000E
       DSN3AUCM.DSNSVSFB+08A2 DSN3AUCM DSNSVSFB
        +08A2 08A2 OFFSET08A2
     ABEND0C4 AB0C4 S00C4 0C4
      0C4-00000038 00000038 RC00000038
       DSNSLD4.DSNSVSFB+03D4 DSNSLD4 DSNSVSFB
        +03D4 03D4 OFFSET03D4
     Overlay overlaid SMCOVRLY DB2OVRLAY DB2OVRLAY/K
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All Db2 for z/OS users.                                      *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * Unpredictable symptoms including:                            *
    *  o ABEND04E RC00E2000E                                       *
    *    DSN3AUCM.DSNSVSFB+08A2                                    *
    *  o ABEND0C4 DSNSLD4.DSNSVSFB+03D4                            *
    *  o DDF Abnormal termination as                               *
    *    indicated by message DSNL033I.                            *
    * The symptoms occur due to an overlay                         *
    * and Db2 must be recycled in order to                         *
    * correct the condition.                                       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Apply corrective PTF when available                          *
    ****************************************************************
    In order to satisfy a user's SQL request, it was necessary
    for Db2 processing to spawn another (SRB related) thread.
    The user generated an abend 13E condition in order to
    interrupt the SQL processing, which is a common event,
    but happened to cause the abend 13E in Db2 while it was
    in a very small and sensitive window of the spawning process.
    The 13E abend interruption of the spawning process, during
    the short instruction window, ultimately leads to a one byte
    binary zero overlay of a "CCB" control block free chain.
    The nature of the one byte CCB free chain overlay leads
    to unpredictable symptoms. Known symptoms include:
     o Abend 04E-00E2000E DSN3AUCM.DSNSVSFB+08A2
     o Abend 0C4-00000038 DSNSLD4 .DSNSVSFB+03D4
     o DDF Abnormal termination as indicated by message DSNL033I.
    The overlay can impact all subsequent processing including
    local application work as well as work that originates from
    remote systems via DDF. The only solution for the overlay
    is to recycle Db2.
    

Problem conclusion

  • Db2 spawning processing has been changed to eliminate the short
    instruction window such that a 13E abend can no longer cause
    a damaged CCB free chain.
    

Temporary fix

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

Comments

APAR Information

  • APAR number

    PI92571

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    C10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-01-17

  • Closed date

    2018-06-27

  • Last modified date

    2018-07-12

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

    PI85876

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

    UI56906

Modules/Macros

  • DSNVEUS1
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • RC10 PSY UI56906

       UP18/07/12 I 1000 ¢

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.



Document information

More support for: DB2 for z/OS

Software version: C10

Reference #: PI92571

Modified date: 12 July 2018


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