IZ74022: JAVA CLASS WITH MANY METHODS CAUSES CRASH IN JIT-COMPILED CODE

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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 5 or Java 6 JVM on z/OS or z/Linux
    receives a SIGSEGV, SIGILL, or ABEND while executing a method
    that has been compiled by the just-in-time compiler. The crash
    is triggered by a branch to a memory location that does not
    contain executable code.
    .
    Stack Trace: N/A
    .
    

Local fix

  • This issue can be worked around by preventing the JIT from
    compiling the affected method, using the -Xjit:exclude={...}
    option. If the affected method is not known, the only workaround
    is to disable the JIT compiler using the -Xint option. Note that
    the latter will cause severe performance degradation.
    

Problem summary

  • The crash occurs when a JIT-compiled method attempts to call a
    virtual method in a very large class (e.g. one that has more
    than 4096 methods on 64-bit z/OS or z/Linux). On some 390
    hardware, the JIT compiler generates incorrect instructions for
    such method calls, resulting in a wild jump.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.0 SR8 FP1
    5.0.0 SR12
    .
    The JIT compiler has been updated to generate correct
    instructions for calls to method in very large classes on all
    hardware types.
    .
    To obtain the fix:
    Install build 20100421 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ74022

  • 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

    2010-04-07

  • Closed date

    2010-04-20

  • Last modified date

    2010-07-22

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

    IZ74021

  • 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 #:

IZ74022

Modified date:

2010-07-22

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