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IT30569: Db2 Administrative Task Scheduler stops executing scheduled tasks

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APAR status

  • Closed as program error.

Error description

  • Db2 ATS ("administrative task scheduler") might stop executing
    scheduled task after running ADMIN_TASK_UPDATE routine under
    specific timing conditions.
    SYSTOOLS.ADMINTASKSTATUS administrative view report no new
    execution entries as the result. A backtrace from db2acd process
    (its process ID is reported e.g. in "db2pd -edus") will show one
    thread with db2HmonAtsPollDatabase on the stack waiting in
    AtsList::lockIt -> ossLockGetConflict
    
    ossLockGetConflict
    AtsList::lockIt
    AtsDaemon::removeTaskFromPending
    AtsDbInfo::refreshTasks
    db2HmonAtsPollDatabase
    
    and another in a stack with AtsTask::lockIt ->
    ossLockGetConflict:
    
    ossLockGetConflict
    AtsTask::lockIt
    AtsDaemon::run
    AtsThread::entryPoint
    
    Backtrace can be obtained using OS tools (e.g. gstack on Linux
    or procstack on AIX).
    

Local fix

  • Killing db2acd process will restart ATS as db2acd will be
    automatically respawned:
    $ kill <pid_of_db2acd>
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Update to Db2 version 11.1 Mod 4 Fix Pack 6 or higher.       *
    ****************************************************************
    

Problem conclusion

  • Problem first fixed in Db2 version 11.1 Mod 4 Fix Pack 6
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT30569

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    B10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-10-10

  • Closed date

    2021-03-31

  • Last modified date

    2021-03-31

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

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

    IT34534

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

[{"Line of Business":{"code":"LOB10","label":"Data and AI"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1"}]

Document Information

Modified date:
01 April 2021