IZ65800: INCORRECT DISTRIBUTION OF LMUL WITH LCONST OVER ISUB/IADD

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: A GPF/SIGSEGV was raised in compiled Java code
    due to the use of an incorrectly computed long value.
    .
    Stack Trace: N/A
    .
    Besides crashing, the affected application can also fail in
    other ways, e.g. producing incorrect output.
    

Local fix

  • This issue can be avoided by excluding the affected Java method
    with the -Xjit:exclude={class.method*} option.
    

Problem summary

  • The problem occurs when the compiled code converts a negative
    int value into a long value, and treats the value as if it was
    positive. This is caused by a bug in the JIT compiler which
    initializes certain internal flags to wrong values, leadingthe
    compiler to assume that the int variable will be positive.
    

Problem conclusion

  • This defect will be fixed in:
    5.0.0 SR12
    6.0.0 SR7
    .
    The JIT compiler has been updated to correct the problem.
    .
    To obtain the fix:
    Install build 20091127 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ65800

  • Reported component name

    JAVA 5 JIT

  • Reported component ID

    620500124

  • Reported release

    500

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2009-11-26

  • Closed date

    2010-01-21

  • Last modified date

    2010-01-21

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

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

    IZ65833

Fix information

  • Fixed component name

    JAVA 5 JIT

  • Fixed component ID

    620500124

Applicable component levels

  • R500 PSN

       UP



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

5.0

Reference #:

IZ65800

Modified date:

2010-01-21

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