IBM Support

IV92360: BYTE ARRAY COPY TERMINATES UNEXPECTEDLY

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APAR status

  • Closed as program error.

Error description

  • Error Message: The copying of one byte array to another
    unexpectedly terminates when 0xFF is read from the source array.
    .
    Stack Trace: N/A
    .
    This problem can only happen on z Systems.
    

Local fix

  • The problem can be avoided using the following Java option:
    -Xjit:disableIdiomRecognition
    Note that this may impact performance.
    

Problem summary

  • As part of the JIT compiler's attempts to optimize loops, it is
    possible that the compiler may not properly recognize a byte
    array copy and mistakenly insert a stopping condition. This
    causes the copy to terminate when the value 0xFF is read from
    the source array when the copying should have continued for the
    entire length of the source array.
    

Problem conclusion

  • The JIT compiler has been updated to prevent incorrectly
    inserting a stopping condition into byte array copying loops.
    .
    This APAR will be fixed in the following Java Releases:
       6 R1 SR8 FP40  (6.1.8.40)
       8    SR4       (8.0.4.0)
       6    SR16 FP40 (6.0.16.40)
       7 R1 SR4       (7.1.4.0)
       7    SR10      (7.0.10.0)
    .
    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

    IV92360

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-01-17

  • Closed date

    2017-01-17

  • Last modified date

    2017-01-17

  • 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

  • R130 PSY

       UP

  • R600 PSY

       UP



Document information

More support for: Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version: 260

Reference #: IV92360

Modified date: 17 January 2017