IBM Support

IT32855: ON BUSY WINDOWS SYSTEMS, IF WLM DISPATCHER IS ON, SOMETIMES THE WHOLE INSTANCE CAN HANG

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APAR status

  • Closed as fixed if next.

Error description

  • On busy Windows systems and WLM Dispatcher is turned ON,
    sometimes the whole system can hang. The main stacks show that
    they are waiting for a CPU slice from the WLM Dispatcher. A
    typical stacks having the following:
    
    00007FFC0F57829C <sqloWaitInterrupt>
    <S:\db2_v111m4fp5\ntx64\s1911120100\engn\sqo\sqloedu.C:643>
      00007FFC0F3FB113 <sqloWaitIPCWaitPost>
    <S:\db2_v111m4fp5\ntx64\s1911120100\engn\sqo\sqlowaitpost.C:2326
    >
      00007FFBDCD063D8 <sqeWLScheduler::StartInterval>
    <any code path below....>
    

Local fix

  • Turn OFF WLM_DISPATCHER
    db2 update dbm cfg using WLM_DISPATCHER OFF immediate
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Db2 v11.1m4fp6                                    *
    ****************************************************************
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    IT32855

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    B10

  • Status

    CLOSED FIN

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-05-13

  • Closed date

    2021-03-12

  • Last modified date

    2021-03-12

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

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

Fix information

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:
13 March 2021