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IT26816: DB2 ABEND DUE TO MEMORY CORRUPTION USING COLUMN BASED TABLES

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APAR status

  • Closed as fixed if next.

Error description

  • When queries are executed with a high degree of parallelism
    while accessing column based tables, a rare timing hole may
    result in memory corruption, causing DB2 to abend.
    
    While the trapping function stack may vary, the most common
    function stack observed is :
    diagnoseMemoryCorruptionAndCrash__13SQLO_MEM_POOLFUlCPCcCb
    sqloDiagnoseFreeBlockFailure__FP8SMemFBlkCb
    sqlofmblkEx
    freeMem__Q3_7ibm_cde8services4HeapFCPCcCUlPv
    freeHeap__Q3_7ibm_cde8services15ManagedHeapBaseFv
    __dt__Q3_7ibm_cde8services15ManagedHeapBaseFv
    __dt__Q3_7ibm_cde8services11ManagedHeapXTUcSP0_Fv
    __dt__Q3_7ibm_cde5query14QueryResourcesFv
    __dt__Q3_7ibm_cde5query9SchedulerFv
    cleanAndDeleteScheduler__Q3_7ibm_cde5query9SchedulerFPQ3_7ibm_cd
    e5query9Scheduler
    

Local fix

  • reducing the maximum or default degree of parallelism will tend
    to avoid the problem, eg. to 4
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Systems processing columnar data.                            *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Issue is addressed in APAR IT26816 in version 11.1.          *
    * Upgrade to Version 11.1 Mod 3 Fix Pack 3 or higher           *
    ****************************************************************
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    IT26816

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    A50

  • Status

    CLOSED FIN

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-10-31

  • Closed date

    2019-06-04

  • Last modified date

    2019-06-04

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

    IT23941

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

Modules/Macros

  • cde
    

Fix information

Applicable component levels

[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"10.5","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
04 June 2019