IBM Support

IV72217: VERY LARGE METHODS MAY BE MISCOMPILED ON POWERPC PLATFORMS

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APAR status

  • Closed as program error.

Error description

  • Error Message: Errors may include SIGSEGV/GPF, assertions, or
    incorrect output or behaviour. This problem only affects PowerPC
    platforms. This problem will likely only be seen in Java 8, or
    Java 6.1, Java 7, and Java 7.1 only when using the balanced or
    metronome GC policies.
    .
    Stack Trace: N/A
    .
    

Local fix

  • This issue can be worked around by disabling the JIT compiler
    via the -Xint option. Disabling the JIT compiler will have a
    major impact on performance.
    

Problem summary

  • Certain very large methods that require the JIT compiler to emit
    a large number of machine instructions may result in incorrect
    code being generated. This problem only affects PowerPC
    platforms. This problem will likely only be seen in Java 8, or
    Java 6.1, Java 7, and Java 7.1 only when using the balanced or
    metronome GC policies.
    

Problem conclusion

  • The JIT has been fixed to generate correct code when a large
    number of machine instructions has been emitted.
    .
    This APAR will be fixed in the following Java Releases:
       7 R1 SR3       (7.1.3.0)
       7    SR9       (7.0.9.0)
       6 R1 SR9       (6.1.9.0)
    .
    Contact your IBM Product's Service Team for these Service
    Refreshes and Fix Packs.
    For those running stand-alone, information about the available
    Service Refreshes and Fix Packs can be found at:
               https://www.ibm.com/developerworks/java/jdk/
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV72217

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    130

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2015-04-14

  • Closed date

    2015-04-14

  • Last modified date

    2015-04-21

  • 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

  • R130 PSY

       UP

  • R260 PSY

       UP



Document information

More support for: Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version: 130

Reference #: IV72217

Modified date: 21 April 2015