IV26343: JIT INLINE GUARD ELIMINATION CAUSING FAILURES

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APAR status

  • Closed as program error.

Error description

  • Error Message: An exception occurs while executing a
    JIT-compiled Java method that gets an incorrect object address
    due to executing the inlined code of the wrong method.  The
    actual failure symptoms may vary depending on what incorrect
    inlined method gets executed.
    .
    Stack Trace: N/A
    .
    

Local fix

Problem summary

  • The problem is caused by a internal JIT optimization that
    incorrectly eliminates inline guards in a particular scenario in
    which class hierarchy optimizations is disabled, but the inline
    guard should not be eliminated when class hierarchy
    optimizations is disabled.
    In very rare cases where the JIT compiler fails compilation of
    the method multiple times due to class hierarchy table changing,
    this problem can occur. It could also occur if a user explicitly
    uses the -Xjit:disableCHOpts option.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.0 SR11
    6.0.1 SR2 FP1
    7.0.0 SR2
    .
    The JIT compiler has been updated to ensure that the inline
    guard does not get eliminated when class hierarchy optimizations
    is disabled.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV26343

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    600

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-08-16

  • Closed date

    2012-08-16

  • Last modified date

    2012-09-07

  • 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

  • R600 PSY

       UP

  • R260 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

6.0

Reference #:

IV26343

Modified date:

2012-09-07

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