IBM Support

IV32314: EXCEPTIONS OR INCORRECT RESULTS DUE TO JIT COMPILER ISSUE

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APAR status

  • Closed as program error.

Error description

  • Error Message: Segmentation fault, unexpected exception, or
    incorrect results in compiled code.
    .
    Stack Trace: N/A
    .
    
    Problem is specific to PPC.
    

Local fix

  • The failing method(s) can be excluded from JIT compilation. For
    example if methods package1.Class1.method1 and
    package2.Class2.method2 are failing the following option could
    be used:
    
    -Xjit:exclude={package1/Class1.method1(*|package2/Class2.method2
    (*}
    
    Alternatively, the problem can be avoided for all methods by
    setting the following environment variable before starting the
    VM:
    export TR_DisableOOLcheckcast=1
    
    If set correctly the JIT will output the following text to
    stderr:
    
    JIT: env var TR_DisableOOLcheckcast is set to 1
    

Problem summary

  • The problem is caused by a JIT compilation bug that can be
    encountered in certain cases.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.1 SR5
    7.0.0 SR4
    .
    The bug has been fixed such that the JIT will generate correct
    code in these cases.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV32314

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-11-19

  • Closed date

    2012-11-19

  • Last modified date

    2013-05-24

  • 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

Modified date:
24 May 2013