IV19704: CRASH WHEN USING SHARED CLASSES

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: Crash when using shared classes
    .
    Stack Trace: Javacore stack trace of failing thread:
    1XMCURTHDINFO  Current thread
    NULL           ----------------------
    3XMTHREADINFO      "Default Executor-thread-0"
    J9VMThread:0x08BA4300, j9thread_t:0x00E4EF98,
    java/lang/Thread:0x0F4CA570, state:R, prio=5
    3XMTHREADINFO1            (native thread ID:0x1844, native
    priority:0x5, native policy:UNKNOWN)
    3XMTHREADINFO3           Java callstack:
    4XESTACKTRACE                at
    com/ibm/oti/shared/SharedClassURLHelperImpl.findSharedClassImpl3
    (Native Method)
    4XESTACKTRACE                at
    com/ibm/oti/shared/SharedClassURLHelperImpl.findSharedClass(Shar
    edClassURLHelperImpl.java:78(Compiled Code))
    5XESTACKTRACE                   (entered lock:
    com/ibm/oti/shared/SharedClassURLHelperImpl@0x10640AA0, entry
    count: 1)
    4XESTACKTRACE                at
    com/ibm/oti/shared/SharedClassURLHelperImpl.findSharedClass(Shar
    edClassURLHelperImpl.java:43(Compiled Code))
    4XESTACKTRACE                at
    com/ibm/cds/CDSBundleFile.getClassBytes(CDSBundleFile.java:207(C
    ompiled Code))
    4XESTACKTRACE                at
    com/ibm/cds/CDSBundleFile.getEntry(CDSBundleFile.java:90(Compile
    d Code))
    ...snip...
    3XMTHREADINFO3           Native callstack:
    4XENATIVESTACK
    Java_com_ibm_oti_shared_SharedClassURLHelperImpl_findSharedClass
    Impl3+0xd7 (shared.c:1184, 0x68039787
    <OSB>jclscar_26+0x29787<CSB>)
    ...snip...
    .
    

Local fix

  • Issue can be worked around by disabling shared classes using
    -Xshareclasses:none.
    

Problem summary

  • The shared classes code was accessing a garbage-collected
    ClassLoader and crashing when null was passed to one of the
    native methods.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.1 SR2
    7.0.0 SR1
    6.0.0 SR11
    .
    The shared classes code has been updated to check for
    garbage-collected ClassLoaders before every access and handle
    this condition internally, or throw an exception if the use is
    in error.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV19704

  • Reported component name

    J9 COMMON CODE

  • Reported component ID

    620700127

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-04-13

  • Closed date

    2012-04-13

  • Last modified date

    2012-04-13

  • 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

  • R260 PSY

       UP

  • R600 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Virtual Machine

Software version:

260

Reference #:

IV19704

Modified date:

2012-04-13

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