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IZ58251: INVARIANT ARGUMENT PREEXISTENCE OPTIMIZATION IN JIT CAUSES UNEXPECTED NPE

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: Customer provided a testcase which generated NPE
    at a point in the code where the object as ascertained to be non
    NULL
    .
    Stack Trace: N/A
    .
    

Local fix

  • -Xjit:disableInvariantArgumentPreexistence
    

Problem summary

  • Th problem occurs because particular part o he JIT optimization
    code was incorrectly transforming the code into another internal
    pattern. This resulted in losing of the preconceived information
    hat a variable cannot be NULL at a point and a NULL value got
    percolated leading to the invalid NPE
    

Problem conclusion

  • This defect will be fixed in:
    5.0.0 SR11
    6.0.0 SR6
    .
    JIT has been fixed to ensure that this incorrect transformation
    does not happen
    .
    To obtain the fix:
    Install build 20090806 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ58251

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    600

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2009-08-17

  • Closed date

    2009-08-18

  • Last modified date

    2009-08-18

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

    IZ58227

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

Fix information

  • Fixed component name

    JIT

  • Fixed component ID

    620700124

Applicable component levels

  • R600 PSN

       UP



Document information

More support for: Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version: 6.0

Reference #: IZ58251

Modified date: 18 August 2009


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