IV11693: JIT COMPILATION CRASH ON SYSTEM Z

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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 or S0C4 ABEND is raised during the
    compilation of a method containing loops that process byte
    arrays. This problem is only seen with Java 6 (or above) running
    on z/OS or z/Linux.
    .
    Stack Trace: TR_CFG::addSuccessorEdges
    TR_CISCTransformer::insertBeforeNodes
    CISCTransform2BitOpMem
    TR_CISCTransformer::computeTopologicalEmbedding
    TR_CISCTransformer::perform
    TR_OptimizerImpl::performOptimization
    TR_OptimizerImpl::optimize
    TR_Compilation::compile
    .
    

Local fix

  • This issue can be worked around using the
    -Xjit:disableIdiomRecognition option. This may cause a
    negligible to moderate impact on the performance of the Java
    application.
    

Problem summary

  • The problem is caused by an incorrect code transformation by an
    optimization in the JIT compiler. The method being compiled
    contains a for loop or while loop that iterates over two byte
    arrays, computes the exclusive-or of successive elements, and
    stores the results into a third byte array. This particular code
    pattern triggers a program bug which leads to the crash.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.0 SR10
    6.0.1 SR1
    7.0.0 SR1
    .
    The JIT compiler has been updated to correct the algorithm used
    for this optimization.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV11693

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    600

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-12-10

  • Closed date

    2011-12-11

  • Last modified date

    2012-05-28

  • 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

  • R600 PSY

       UP

  • R260 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

6.0

Reference #:

IV11693

Modified date:

2012-05-28

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