IBM Support

IJ04429: A GPF EVENT IS THROWN FROM JAVA_COM_IBM_JIT_JITHELPERS_GETBACKFILLOFFSETFROMJ9CLASS64 OR A NULLPOINTEREXCEPTION IS THROWN

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APAR status

  • Closed as program error.

Error description

  • Error Message: A GPF event is received or a NullPointerException
    is received when method java/lang/Object.hashCode() is called.
    .
    Stack Trace: The native stack trace looks like this (if it is a
    crash):
    
    jclse7b_29!Java_com_ibm_jit_JITHelpers_getBackfillOffsetFromJ9Cl
    ass64
    The Java stack trace looks like this:
    
    com/ibm/jit/JITHelpers.getBackfillOffsetFromJ9Class64(J)J
    
    java/lang/J9VMInternals.fastIdentityHashCode(Ljava/lang/Object;)
    I
            java/lang/Object.hashCode()I
    .
    

Local fix

Problem summary

  • The problem is caused when a 32 bit class pointer is
    sign-extended to a 64-bit inaccessible address.
    

Problem conclusion

  • The JVM has been updated so that the 32 bit class pointer is
    properly extended to a 64 bit one.
    .
    This APAR will be fixed in the following Java Releases:
       8    SR5 FP11  (8.0.5.11)
    .
    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

    IJ04429

  • Reported component name

    J9 COMMON CODE

  • Reported component ID

    620700127

  • Reported release

    270

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-02-26

  • Closed date

    2018-03-01

  • Last modified date

    2018-06-05

  • 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



Document information

More support for: Runtimes for Java Technology
Virtual Machine

Software version: 270

Reference #: IJ04429

Modified date: 05 June 2018