PI15304: DSNB1LDA ISSUING DSNVCNCL WITHOUT HOLDING THE VLCASAGT LATCH AND CAUSED THE SYSTEM DOWN WITH REASON CODE OF 00F30420

A fix is available

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APAR status

  • Closed as program error.

Error description

  • This is a serialization problem with DSNB1LDA issuing DSNVCNCL
    without holding the VLCASAGT latch when cancel the ACEEBA
    and then caused the system down with reason code of RC00F30420
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All DB2 users.                               *
    ****************************************************************
    * PROBLEM DESCRIPTION: MSGDSNV086E DB2 ABNORMAL TERMINATION    *
    *                      REASON=00F30420 running REORG utility   *
    *                      with FORCE option                       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    When REORG FORCE cancels a thread, the cancel operation picks up
    the EB control block address without holding a system latch.
    When the EB address is used for thread cancellation, the EB
    address may have been reused by a different thread. As a result,
    a wrong thread may get cancelled, and depending on the
    activities of the cancelled thread, DB2 may be brought down.
    

Problem conclusion

  • DB2 has been fixed to acquire a system latch before picking up
    the EB address for thread cancellation. The latch protects the
    EB address from getting freed and reused until the cancel
    operation is complete.
    

Temporary fix

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

Comments

APAR Information

  • APAR number

    PI15304

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    A10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-04-08

  • Closed date

    2014-06-10

  • Last modified date

    2014-07-01

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

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

    UI18723 UI18724

Modules/Macros

  •    DSNB1DRA DSNB1LDA DSNB1LDN DSNB1LRR
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • RA10 PSY UI18723

       UP14/06/25 P F406

  • RB10 PSY UI18724

       UP14/06/25 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


More support for:

DB2 for z/OS

Software version:

A10

Reference #:

PI15304

Modified date:

2014-07-01

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