IV27928: INCONSISTENT -XTLHPREFETCH USAGE CAUSES CRASH IN JIT

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
    .
    Stack Trace: N/A
    .
    An AOT compiled method crashes when the shared classes cache is
    populated using a different mode from a second run, e.g. the
    shared cache is populated with -XtlhPrefetch but the subsequent
    run does not have -XtlhPrefetch on the command line or vice
    versa.
    

Local fix

  • Always run with the same TLHPrefetch mode.
    

Problem summary

  • Running a subsequent run with a different TLHPrefetch mode is
    incompatible with the previous mode because the AOT code is
    generated with the assumption that the mode is either ON or OFF,
    but is incorrect if the mode is changed.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.1 SR4
    7.0.0 SR3
    .
    The JVM has been modified to perform AOT compatibility checks to
    ensure that the AOT code is used only when we are running with
    compatible THLPrefetch modes.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV27928

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-09-13

  • Closed date

    2012-09-17

  • Last modified date

    2012-11-11

  • 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



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

260

Reference #:

IV27928

Modified date:

2012-11-11

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