IBM Support

IV43394: -XLOCKWORD:NOLOCKWORD MAY CAUSE MISALIGNED LONG/DOUBLE FIELDS IN 32 BIT AND COMPRESSEDREFS JVMS

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APAR status

  • Closed as program error.

Error description

  • Error Message: n/a
    .
    Stack Trace:
    .
    

Local fix

  • Remove the?-Xlockword:nolockword=<class> option from the
    affected classes.
    

Problem summary

  • Using the -Xlockword:nolockword=<class> option with classes that
    have long/double fields may cause misalignment of the
    long/double fields, causing loads and stores to these fields to
    not be atomic, which can result in undefined behavior.
    

Problem conclusion

  • This defect will be fixed in:
    7.0.0 SR5
    6.0.1 SR6
    .
    The JVM is fixed so the fields are properly aligned in all
    cases.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV43394

  • Reported component name

    J9 COMMON CODE

  • Reported component ID

    620700127

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-05-29

  • Closed date

    2013-05-29

  • Last modified date

    2013-05-29

  • 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

    J9 COMMON CODE

  • Fixed component ID

    620700127

Applicable component levels

  • R260 PSY

       UP



Document information

More support for: Runtimes for Java Technology
Virtual Machine

Software version: 260

Reference #: IV43394

Modified date: 29 May 2013