IZ73769: JAVA JIT ON PPC - PASSING INCORRECT RETURN ADDRESS TO INTERPRETE R

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: SIGSEGV with the $IAR and $LR set to NULL. The
    $CTR is pointing to jitExitInterpreter0().
    .
    Stack Trace: N/A
    .
    The problem results in an random value (but NULL is the most
    likely) in the $IAR, $LR and $R0. All three registers will
    contain the same value if this problem is encountered. The $CTR
    will mostly likely contain a pointer to jitExitInterpreter#().
    No accurate stack trace will be provided by any tools (dbx, kca,
    javacore, etc.) for the crashing thread.
    

Local fix

  • The problem can be avoided by disabling one JIT optimization
    using the following java command line argument:
    -Xjit:disableInvariantArgumentPreexistence
    Using this option will cause a 1-5% performance regression
    depending on properties of the application that is running.
    

Problem summary

  • The JIT would pass an incorrect return address when invoking the
    Interpreter to execute a Java method that contains at least one
    long argument. The problem only occurs when a very rare and
    complex set of runtime conditions exist.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.0 SR9
    5.0.0 SR12
    .
    The JIT was modified so that this problem will no longer occur.
    .
    To obtain the fix:
    Install build 20100410 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ73769

  • 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

    2010-04-01

  • Closed date

    2010-05-27

  • Last modified date

    2010-05-27

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

    IZ73768

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

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 #:

IZ73769

Modified date:

2010-05-27

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