IZ72639: JAVA JIT CRASH ON WINDOWS WHILE USING -XRS OPTION

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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/GPF is received when a JIT-compiled
    Java method throws a NullPointerException, and the JVM is
    running with the -Xrs option set. The problem only occurs on
    Windows.
    .
    Stack Trace: N/A
    .
    

Local fix

  • The issue can be avoided by not using the -Xrs option, or by
    setting the environment variable TR_DisableEBPasGPR=1 prior to
    invoking the JVM.
    

Problem summary

  • The -Xrs option forces the JVM into "reduced signal" mode, which
    prevents the Java just-in-time compiler (JIT) from optimizing
    null checks. On Windows, this means that one of the hardware
    registers in the CPU must be reserved for a null check, but the
    JIT compiler was not correctly reserving this register.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.0 SR8
    5.0.0 SR12
    .
    The JIT compiler has been updated to prevent the crash from
    occurring during a null check.
    .
    To obtain the fix:
    Install build 20100323 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ72639

  • 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

    2010-03-17

  • Closed date

    2010-04-16

  • Last modified date

    2010-07-22

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

    IZ72629

  • 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 #:

IZ72639

Modified date:

2010-07-22

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