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LI72583: POSSIBLE CRASH/SEGMENTATION-FAULT USING SMP SORTS AND STMM.

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • When SMP parallelism is enable, and STMM for SORTHEAP is enabled
    if some operation requests mutiple smp-sorts to satisfy its
    sorting requirements, a timing hole may expose an uninitialized
    pointer when reserving memory for these smp-sorts. The result is
    typically a segmentation fault/crash.
    Preventive...if the APAR is not applied, and you have SMP
    parallelism enable and have SORTHEAP managed by STMM (AUTOMATIC)
    and invoke operation which may requires smp-sorts under the
    covers, you may be exposed to this segmentation fault.
    Reactive...Typical symptoms are a trap file containing functions
    like:
        stmmSimulateSortCreate
        stmmCreateVirtualSorts
        stmmStartSortListMonitorIfNecessary
        sqlsCreateSort
    Workaround...Disable SMP parallelism (this may hinder
    performance) or disable STMM for SORTHEAP.
    

Local fix

  • Disable SMP parallelism (may hinder performance), or, disable
    STMM for SORTHEAP.
    

Problem summary

  • Users Affected : All
    Problem Description :
       Possible crash/segmentation fault using SMP SORTS and STMM.
    

Problem conclusion

  • Problem was fixed in V9.1 FP5 (s080512).
    

Temporary fix

  • Disable SMP parallelism or disable STMM for SORTHEAP.
    

Comments

APAR Information

  • APAR number

    LI72583

  • Reported component name

    DB2 UDE ESE LIN

  • Reported component ID

    5765F4104

  • Reported release

    910

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2007-09-17

  • Closed date

    2009-04-27

  • Last modified date

    2009-04-27

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

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

    IZ18582

Modules/Macros

  • ENGN_SQD
    

Fix information

  • Fixed component name

    DB2 UDE ESE LIN

  • Fixed component ID

    5765F4104

Applicable component levels

  • R910 PSN

       UP

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Document Information

Modified date:
16 October 2021