IZ55337: JAVA HANG WHILE THE JIT IS COMPILING A METHOD

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: The Java JIT compiler hangs and consumes 100%
    CPU during the compilation of a method.
    .
    Stack Trace:
    {libj9jit24.so}{walker__22TR_ByteCodeIlGeneratorFP8TR_Block}
    {libj9jit24.so}{genExceptionHandlers__22TR_ByteCodeIlGeneratorFP
    8TR_Block}
    {libj9jit24.so}{genILFromByteCodes__22TR_ByteCodeIlGeneratorFv}
    {libj9jit24.so}{internalGenIL__22TR_ByteCodeIlGeneratorFv}
    {libj9jit24.so}{genIL__22TR_ByteCodeIlGeneratorFv}
    {libj9jit24.so}{genIL__23TR_ResolvedMethodSymbolFP11TR_FrontEndP
    14TR_CompilationP23TR_SymbolReferenceTablebP8TR_ArrayXTP18TR_Sym
    bolReference_}
    .
    A JVMTI agent or some kind of bytecode manipulation software
    may be in use, to log or profile exceptions, or to instrument
    exception handling behaviour in some fashion.
    

Local fix

  • Disable any JVMTI agent or bytecode manipulation sofwtare that
    may be modifying the Java bytecodes. If the problem persists,
    the issues can be avoided by using the -Xjit:exclude={...}
    option to prevent the JIT compiler from compiling the offending
    method.
    

Problem summary

  • The JIT failed to handle a rare kind of method
    in which all the code reachable only by an exception handler
    was not contiguous in the bytecode stream. Normally, javac does
    not produce such methods; they are typically products of
    bytecode manipulation.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.0 SR6
    5.0.0 SR11
    .
    The JIT was modified to handle this case correctly.
    .
    To obtain the fix:
    Install build 20090806 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ55337

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    600

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2009-07-17

  • Closed date

    2009-11-25

  • Last modified date

    2009-11-30

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

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

    IZ66091

Fix information

  • Fixed component name

    JIT

  • Fixed component ID

    620700124

Applicable component levels

  • R600 PSN

       UP



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

6.0

Reference #:

IZ55337

Modified date:

2009-11-30

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