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IV66991: CLASS REDEFINITION CAUSES INCORRECT CODE PATCHING ON POWER

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Error Message: A SIGSEGV is raised by the JVM in the JIT
    compiler module when HCR (hot code replace) mode is enabled.
    .
    Stack Trace:
    resolveClassRefresolveSpecialMethodRefIntoresolveSpecialMethodRe
    f
    .
    

Local fix

  • This issue can be worked around using the -Xnoaot option.
    

Problem summary

  • The problem is trigger by a class redefinition, which forces the
    JIT compiler to update all related compiled methods in the code
    cache. If one of those methods was AOT-compiled, the JIT
    compiler could introduce an incorrect patch to a constant pool
    pointer within the method, leading to a crash.
    

Problem conclusion

  • The JIT has been updated to produce correct AOT-compiled code to
    prevent the issue.
    .
    This APAR will be fixed in the following Java Releases:
       7    SR8 FP10  (7.0.8.10)
       6 R1 SR8 FP3   (6.1.8.3)
    .
    Contact your IBM Product's Service Team for these Service
    Refreshes and Fix Packs.
    For those running stand-alone, information about the Service
    Refreshes and Fix Packs can be found at:
               https://www.ibm.com/developerworks/java/jdk/
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV66991

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-11-17

  • Closed date

    2014-11-17

  • Last modified date

    2015-01-06

  • 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

Modified date:
08 January 2022