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IV85347: JIT COMPILER CRASHES OR HANGS DURING IDIOM TRANSFORMATION

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
    .
    Stack Trace: TR_TreeTop::getEnclosingBlock(bool)
    CISCTransform2CopyingTROx(TR_CISCTransformer*)
    ...
    .
    The JVM receives a segmentation fault. On AIX the JIT compiler
    hangs with high
    CPU usage instead.
    In Java 7, 6.1, and 6, this problem only occurs on
    z/Architecture.
    

Local fix

  • The issue can be avoided with -Xjit:disableIdiomRecognition.
    This option has
    some performance impact, but it may be restricted to the
    problematic method.
    

Problem summary

  • An optimization in the JIT compiler recognized a loop and
    attempted to
    transform it into a specialized sequence of instructions. The
    particular loop
    had a highly specific unanticipated sequence of intermediate
    code that caused
    the transformation to fail.
    

Problem conclusion

  • The compiler has been modified so that it will identify loops
    that are
    problematic in this way and avoid transforming them.
    .
    This APAR will be fixed in the following Java Releases:
       8    SR3 FP10  (8.0.3.10)
       6    SR16 FP30 (6.0.16.30)
       6 R1 SR8 FP30  (6.1.8.30)
       7 R1 SR3 FP50  (7.1.3.50)
       7    SR9 FP50  (7.0.9.50)
    .
    Contact your IBM Product's Service Team for these Service
    Refreshes and Fix Packs.
    For those running stand-alone, information about the available
    Service Refreshes and Fix Packs can be found at:
               https://www.ibm.com/developerworks/java/jdk/
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV85347

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    130

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-05-31

  • Closed date

    2016-05-31

  • Last modified date

    2016-05-31

  • 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

  • R130 PSY

       UP

  • R600 PSY

       UP

  • R260 PSY

       UP

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Document Information

Modified date:
31 May 2016