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IT36658: MON_GET_APPL_LOCKWAIT MIGHT HANG IN PURESCALE

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APAR status

  • Closed as program error.

Error description

  • This problem only occurs in 11.1.4.6, and only affects
    pureScale.
    
    In pureScale, the use of "mon_get_appl_lockwait" might cause
    a hang.   When the problem occurs, an agent can be found to
    be waiting on a latch called SQLO_LT_SQLP_LHSH__xhshlatch
    with the following stack:
    
    0x090000000D2D7C98 sqloXlatchConflict + 0x8F8
    0x090000000D9966C8
    sqlpLLMTryInstant__FP9sqeBsuEduP14SQLP_LOCK_INFOP9SQLP_LHSHPUcN2
    4Ps + 0xAA8
    0x090000000E30B554
    sqlplGetHoldingMemberForLock__FCP9sqeBsuEduCPC13SQLP_LOCKNAMEUl
    + 0x194
    0x0900000011FA6DA4
    execute__25sqlrwAgentLockWaitBuilderFP8sqeAgentT1 + 0xB44
    0x0900000011FA8A20
    execute__29sqlrwApplicationAgentIteratorFP14sqeApplication +
    0x2E0
    0x0900000011FAC954 execute__32sqlrwFilteredApplicationIteratorFv
    + 0x6D4
    0x0900000011FE122C
    sqlrwGetApplLockwait__FP8sqlrr_cbP24sqlrwGetApplLockwaitArgsPPvP
    l + 0x2AC
    0x0900000011FF9624
    sqlrwGetWLMTableFunctionResult__FP8sqlrr_cbP20sqlrw_rpc_tf_reque
    stPPvPlbP19SQLR_BDSREPLY_STATE + 0x364
    0x090000001478BB14 sqlrwGetWLMTableFunctionMergedResult__FUiPPv
    + 0x10B4
    0x090000000DFAF818 sqlerTrustedRtnCallbackRouter__FUiPPv + 0x378
    0x090000003F22EFC0 monGetApplLockwait + 0x1540
    0x090000000D23F414 sqloInvokeFnArgs + 0x5B94
    0x090000000F92A240
    IPRA.$sqlriInvokerTrusted__FP10sqlri_ufobP21sqlriRoutineErrorInt
    fb + 0xC60
    0x090000000F921E28 sqlriInvokeInvoker__FP10sqlri_ufobb + 0x2008
    

Local fix

  • Avoid the use of mon_get_appl_lockwait.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * AIX/LINUX                                                    *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Db2 v11.1.4.7                                     *
    ****************************************************************
    

Problem conclusion

  • Upgrade to Db2 v11.1.4.7
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT36658

  • 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

    2021-04-22

  • Closed date

    2022-04-17

  • Last modified date

    2022-04-17

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

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

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • RB10 PSY

       UP

[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSEPGG","label":"DB2 for Linux- UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
03 May 2022