IV19962: Incorrect output when using balanced or metronome GC policies

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APAR status

  • Closed as program error.

Error description

  • Array data may be incorrectly processed when using the
    'balanced' or 'metronome' garbage collection policies. This may
    cause incorrect application behaviour such as incorrect output
    or unexpected exceptions.
    

Local fix

  • The problem may be avoided by using a different garbage
    collector, or by disabling a specific optimisation with the
    command-line option
    
    -Xjit:disableBlockVersioner
    

Problem summary

  • Problem may affect SRT and Balanced.
    It was introduced in Java7GA when switched to Hybrid arrays.
    Problem is in handling bndchkwithspinechk within VPhandler,
    causing the code to take a wrong path (believing it needs to
    take the exception).
    

Problem conclusion

  • This defect will be fixed in:
    7.0.0 SR1
    6.0.1 SR2
    WRT-V3 SR1
    .
    Add necessary guard to make sure we are looking at the right
    value for the node when deciding on the path.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV19962

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-04-20

  • Closed date

    2012-05-19

  • Last modified date

    2012-05-19

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    IV21493

Fix information

  • Fixed component name

    JIT

  • Fixed component ID

    620700124

Applicable component levels

  • R260 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

260

Reference #:

IV19962

Modified date:

2012-05-19

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