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IT31866: FODC_TRAP IN MEMCOPY IS POSSIBLE WHEN EXECUTING A COMPLEX QUERY WITH RID FUNCTION WHEN INTERNAL OPTIMIZATIONS ARE DONE

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APAR status

  • Closed as program error.

Error description

  • Instance could go down with a NULL pointer access during
    execution of the query in a very rare specific case, when
    internal optimization is done.
    Stacks could vary, but most likely
    - RID function is used in the query
    - Plan has a TEMP or a SORT and there are operations above it.
    - Stack will have sqldEvalDataPred executing sqlri* function
    
    Support needs to be contacted and dumps must be provided for
    examination
    to be sure that this issue is hit.
    
    One of possible stacks:
    
    memcpy
    sqlri_max_Complete_Bigint
    sqlriaggNoGroup2
    sqldEvalDataPred
    sqlsfetc
    sqlriNljnPiped
    sqlriSectInvoke
    sqlrr_subagent_router
    ...
    

Local fix

  • db2stop
    db2set DB2_TCG_DEFAULT_OPTIONS="set disable_pushdown on"
    db2start
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * RID function and SORT                                        *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * See Error Description                                        *
    ****************************************************************
    

Problem conclusion

  • See Error Description
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT31866

  • 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

    2020-02-14

  • Closed date

    2021-03-19

  • Last modified date

    2021-03-19

  • 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