IBM Support

IV50589: JAVA JIT OPTIMIZATIONS BASED ON UNINITIALIZED CLASSES CAUSE INCO RRECT PROGRAM BEHAVIOUR

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APAR status

  • Closed as program error.

Error description

  • Error Message: A Java program exhibits unexpected behaviour, or
    causes the JVM to crash.
    .
    Stack Trace: N/A
    .
    N/A
    

Local fix

  • -Xjit:disableGlobalVP,disableLocalVP
    

Problem summary

  • The problem is caused by a JIT compiler optimization known as
    value propagation. When a Java method which uses a class that
    has been loaded but not yet initialized is compiled, the
    optimization transforms its code incorrectly, leading to
    incorrect program behaviour.
    

Problem conclusion

  • This defect will be fixed in:
    7.0.0 SR6
    6.0.1 SR7
    6.0.0 SR15
    .
    The JIT compiler has been updated to ensure that classes are
    loaded and initialized before the optimizer uses them in value
    propagation.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV50589

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-10-08

  • Closed date

    2013-10-08

  • Last modified date

    2013-10-21

  • 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

    JIT

  • Fixed component ID

    620700124

Applicable component levels

  • R260 PSY

       UP

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Document Information

Modified date:
21 October 2013