IZ80935: JIT-COMPILED METHOD SHOWS INCORRECT BEHAVIOUR WITH -XQUICKSTART

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: The Apache Harmony method
    org/apache/harmony/jndi/internal/parser/RelaxedDnParser.parse
    (which is used by the javax/naming/ldap API) can behave
    incorrectly or return incorrect result, when it is compiled by
    the just-in-time compiler, and when the -Xquickstart option is
    in effect. The issue may affect other methods as well.
    .
    Stack Trace: N/A
    .
    

Local fix

  • This issue can be avoided with the -Xjit:disableGlobalVP option.
    Note however this will cause a significant performance
    degradation. Removing the -Xquickstart may or may not prevent
    the problem completely.
    

Problem summary

  • The problem is caused by a JIT compiler analysis that had
    ignored certain exception paths in the compiled method, leading
    to incorrect logic in the resulting code.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.0 SR8
    5.0.0 SR12
    .
    The JIT compiler has been updated to prevent the problem.
    .
    To obtain the fix:
    Install build 20100128 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ80935

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    600

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-07-26

  • Closed date

    2010-07-26

  • Last modified date

    2010-07-26

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

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

    IZ80936

Fix information

  • Fixed component name

    JIT

  • Fixed component ID

    620700124

Applicable component levels

  • R600 PSN

       UP



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

6.0

Reference #:

IZ80935

Modified date:

2010-07-26

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