IZ84492: COMPILED JAVA METHOD CRASHES IN LOOP USING SHIFTED ARRAY INDEX

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: A SIGSEGV/GPF is raised by the JVM during the
    execution of a JIT-compiled method that contains a loop which
    uses a shifted index (i.e. multiplied by a power of 2) to access
    an array. This problem affects Java 5 and Java 6 on 64-bit z/OS
    or z/Linux only.
    .
    Stack Trace: N/A
    .
    

Local fix

  • This issue can be worked around with the -Xjit:disableGRA
    option. Note that this will cause a significant performance
    impact on the Java application. Alternatively the offending
    method can be excluded from JIT compilation with the
    -Xjit:exclude= option.
    

Problem summary

  • The problem is caused by an incorrect LR instruction in the
    compiled code generated by the z/Architecture code generator in
    the JIT compiler.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.0 SR9
    5.0.0 SR13
    .
    The JIT compiler has been updated to generate the correct LGR
    instruction in methods with similar uses of shifted loop
    indices.
    .
    To obtain the fix:
    Install build 20100918 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ84492

  • 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

    2010-09-09

  • Closed date

    2010-09-24

  • Last modified date

    2010-09-24

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

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

    IZ84493

Fix information

  • Fixed component name

    JAVA 5 JIT

  • Fixed component ID

    620500124

Applicable component levels

  • R500 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

5.0

Reference #:

IZ84492

Modified date:

2010-09-24

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