IZ96936: COMPILED CODE PATCHING DURING CLASS UNLOADING LEADS TO INVALID J UMP TARGET.

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: A SEGSEGV/GPF is received when the application
    attempts to executed invalid code.
    .
    Stack Trace: N/A
    .
    

Local fix

  • The workaround for this issue is to exclude the method in which
    the crash is occurring through:
    -Xjit:exclude={*Class.method*}
    

Problem summary

  • To parts of the JIT generated code were registered as targets of
    dynamic patching. A jmp instruction was patched in at a target
    address, however a class unloading mechanism would come in an
    patch a -1 over the same target.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.0 SR9FP1
    5.0.0 SR12FP5
    .
    The issue has been resolved in the JIT and the two patching
    sites no longer overlap.
    .
    To obtain the fix:
    Install build 20110405 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ96936

  • Reported component name

    JAVA 5 JIT

  • Reported component ID

    620500124

  • Reported release

    500

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-03-21

  • Closed date

    2011-05-25

  • Last modified date

    2011-05-25

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

    IZ96935

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

Fix information

  • Fixed component name

    JAVA 5 JIT

  • Fixed component ID

    620500124

Applicable component levels

  • R500 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

5.0

Reference #:

IZ96936

Modified date:

2011-05-25

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