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IV90105: JAVA IMPROPERLY REUSES STACK LOCATION

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
    .
    Stack Trace: N/A
    .
    A local variable or temporary on the stack holds an incorrect
    value, including possibly a reference to an object of unexpected
    type, during execution of a method body compiled for profiling.
    

Local fix

  • The problem can be avoided by using -Xjit:disableCompactLocals,
    at the cost of additional stack usage. If this option is
    restricted to the problematic method, the increase in stack
    usage should generally be small.
    

Problem summary

  • The JIT compiler performs an analysis in order to share stack
    space between local variables and temporaries with
    nonoverlapping lifetimes. When compiling for profiling, further
    optimization could be performed after this analysis,
    invalidating the result. In this case, variables with
    overlapping lifetimes could be assigned the same storage
    location.
    

Problem conclusion

  • The compiler has been modified to ensure that conflicting
    variables are assigned distinct stack locations when compiling
    for profiling.
    .
    This APAR will be fixed in the following Java Releases:
       7 R1 SR3 FP60  (7.1.3.60)
       8    SR3 FP20  (8.0.3.20)
       7    SR9 FP60  (7.0.9.60)
       6 R1 SR8 FP35  (6.1.8.35)
       6    SR16 FP35 (6.0.16.35)
    .
    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

    IV90105

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    130

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-10-18

  • Closed date

    2016-10-18

  • Last modified date

    2016-10-18

  • 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

  • R260 PSY

       UP

  • R600 PSY

       UP



Document information

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

Software version: 130

Reference #: IV90105

Modified date: 18 October 2016