IV19226: CRASH IN JIT-COMPILED CODE ON Z196

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APAR status

  • Closed as program error.

Error description

  • Error Message: The Java virtual machine (JVM) crashes with a
    SIGSEGV (or S0C4 ABEND) while attempting to load a class, or
    load a value from an object, within a JIT-compiled method. This
    only happens with Java 6.0.1 or Java 7 on a z196 system.
    .
    Stack Trace: When the ABEND occurs during class loading, the
    native call stack is as follows:
    .
    SENDLOADCLASS+0x835ca090
    callLoadClass+0x835b39c8
    arbitratedLoadClass+0x835b2548
    internalFindClassUTF8+0x835b0c48
    internalFindClassString+0x835af6c0
    SENDLOADCLASS+0x835ca090
    callLoadClass+0x835b39c8
    arbitratedLoadClass+0x835b2548
    internalFindClassUTF8+0x835b0c48
    resolveStaticMethodRef+0x8355c7b0
    RUNJAVATHREAD+0x835cd978
    javaProtectedThreadProc+0x83545108
    j9sig_protect+0x836d1d90
    javaThreadProc+0x83542598
    thread_wrapper+0xefa50ad8
    .
    If the JIT-compiled code is loading a value from an object,
    the instruction that causes the ABEND typically tries to load
    from a register that has been corrupted by an earlier LFH
    instruction, e.g.
    .
    E320 2008 00CA    LFH R2,8(,R2)
    .
    

Local fix

  • The -Xjit:disableHighWordRA,disableHighWordGRA option will
    work around the problem.
    

Problem summary

  • The problem is caused by an issue in the high-word register
    allocator which result in incorrect register spills and reloads
    in the JIT-compiled code.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.1 SR2
    7.0.0 SR1
    .
    The JIT compiler has been updated to fix the register allocation
    algorithm.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV19226

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-04-09

  • Closed date

    2012-04-09

  • Last modified date

    2012-11-06

  • 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

  • R260 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

260

Reference #:

IV19226

Modified date:

2012-11-06

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