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IT27078: MEMORY ALLOCATED BY A MONITOR FUNCTION ON STANDBY MIGHT NOT BE FREED UP AND MIGHT LEAK AFTER DATABASE IS DEACTIVATED/TAKEOVER

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APAR status

  • Closed as program error.

Error description

  • The fix for APAR IT19483 is incomplete, as a result, even with
    its fix, the memory allocated by the monitor function on a HADR
    standby database might not be freed up properly and might leak
    after the database is deactivated/takeover.
    
    It can be checked by the following command for monh pool (PoolID
    11). Memory allocated by File:2241390729 and LOC:905 is not
    freed for a long time. (LOC 905 might be changed depending on
    the Fix Pack.)
    
    > db2pd -memblocks 11 sort
    
    <skipped>
    Memory blocks sorted by size for monh subpool: (PoolID: 11,
    SecondID: 0, PoolAddr: 0x078000000002F328)
    PoolID     PoolName   TotalSize(Bytes)     TotalCount LOC   File
    
    11         monh       27488322             138356     1162
    2241390729
    Total size for monh subpool: 27488322 bytes (PoolID: 11,
    SecondID: 0, PoolAddr: 0x078000000002F328)
    <skipped>
    

Local fix

  • Have to restart the instance to free up the leaked memory.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ALL                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Db2 11.1 Mod 4 Fixpack 5 or higher                *
    ****************************************************************
    

Problem conclusion

  • First fixed in Db2 11.1 Mod 4 Fixpack 5
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT27078

  • 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

    2018-11-26

  • Closed date

    2020-01-16

  • Last modified date

    2020-01-16

  • 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 PSN

       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:
04 May 2022