IBM Support

IV79832: UNEXPECTED NULLPOINTEREXCEPTION ON X86 AND SEGMENTATION ERROR ON OTHER PLATFORMS

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APAR status

  • Closed as program error.

Error description

  • Error Message: Unexpected java.lang.NullPointerException is
    thrown from Java program on X86. On other platforms, a
    segmentation error can be seen.
    .
    Stack Trace: N/A
    .
    

Local fix

  • This issue can be worked around using the
    -Xjit:disableGuardedCallArgumentRemat option.
    

Problem summary

  • When performing optimizations, the JIT compiler erroneously
    duplicated a load from an object's field. This was invalid
    because the reference pointing to the original object was
    reassigned in between the original and duplicated loads. When we
    try to load the field again, we can get a NullPointerException.
    

Problem conclusion

  • The JIT compiler has been improved to gather enough information
    to avoid duplicating loads whose value might be changed after
    the original load.
    .
    This APAR will be fixed in the following Java Releases:
       8    SR2 FP10  (8.0.2.10)
    .
    Contact your IBM Product's Service Team for these Service
    Refreshes and Fix Packs.
    For those running stand-alone, information about the available
    Service Refreshes and Fix Packs can be found at:
               https://www.ibm.com/developerworks/java/jdk/
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV79832

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    130

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2015-12-16

  • Closed date

    2015-12-16

  • Last modified date

    2015-12-16

  • 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

  • R130 PSY

       UP

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Document Information

Modified date:
16 December 2015