IZ60577: GLOBALINCORRECT GVP OPTIMIZATION IN THE JIT CAUSES UNEXPECTED EX CEPTION AND CRASH

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: Unexpected exception an crash in compiled code
    due to bad compiled code
    .
    Stack Trace: N/A
    .
    The value being checked is ensured to be non null at a point in
    the java code. Yet we get NPE o crash
    

Local fix

  • -Xjit:disableGlobalVP
    

Problem summary

  • Incorrect JIT Value Propagation Optimization within the loops
    resulted in discarding of values that got upated within loops.
    

Problem conclusion

  • This defect will be fixed in:
    5.0.0 SR11
    6.0.0 SR7
    .
    The JIT library has been modified to handle such scenarios
    effeciently.
    .
    To obtain the fix:
    Install build 20090922 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ60577

  • 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

    2009-09-18

  • Closed date

    2009-09-23

  • Last modified date

    2009-09-30

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

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

    IZ60729

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 #:

IZ60577

Modified date:

2009-09-30

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