IBM Support

IT33367: PRIVATE MEMORY LEAK IN DB2SYSC SERVICE ON WINDOWS CAUSED BY DB2PD -MEMBLOCKS.

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APAR status

  • Closed as program error.

Error description

  • Private memory leak might be observed in db2sysc (db2syscs.exe)
    process after executing db2pd -memblock command.
    Possible leaking stack is like as below.
    
        ntdll!RtlAllocateHeap+4079
        ntdll!RtlAllocateHeap+767
        MSVCR120!malloc+5B
        DB2OSSE64!ossMemAlloc+1C4
        DB2PDLIB!UniqAndSort::add+1AB
        DB2PDLIB!pdPrintBlockInfoForPool+AF5
        DB2PDLIB!pdPrintMemoryBlockList+26E
        DB2PDLIB!pdMemoryBlockList+8CB
        DB2PDLIB!db2pdbeInt+E0F
        DB2PDLIB!db2pdbe+A1
        DB2SYS64!sqloRemThread+189
        KERNEL32!BaseThreadInitThunk+14
        ntdll!RtlUserThreadStart+21
    
    Note: db2pd command cannot capture this memory leak symptom.
    

Local fix

  • Please do not run db2pd -memblock command frequently.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * all                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Db2 11.1.4.6 or higher                            *
    ****************************************************************
    

Problem conclusion

  • Upgrade to Db2 11.1.4.6 or higher
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT33367

  • 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

    2020-06-29

  • 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:

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