The JCK package Versioning tests causes the VM to crash on the latest prmoted JDK1.2 build ( JDK1.2beta3-D ). The tests that fail are in 
java_lang/versioning/PkgVersioning.html. The thread sump is as follows:-

SIGSEGV   11*  segmentation violation
    si_signo [11]: SIGSEGV   11*  segmentation violation
    si_errno [0]: Error 0
    si_code [1]: SEGV_MAPERR [addr: 0x0]

        stackbase=F0000000, stackpointer=EFFFEA90

Full thread dump:
    "CachedReference sweeper" (TID:0xee300e18, sys_thread_t:0x5ba98, state:CW) prio=9
        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:315)
        at java.lang.Runtime.waitForMemoryAdvice(Runtime.java:569)
        at java.lang.ref.CachedReference$Sweeper.run(CachedReference.java:346)
        at java.lang.Thread.run(Thread.java:490)
    "Finalizer" (TID:0xee3004f0, sys_thread_t:0x519d8, state:CW) prio=8
        at java.lang.Object.wait(Native Method)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:86)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:99)
        at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:131)
    "Reference handler" (TID:0xee3005b0, sys_thread_t:0x42360, state:CW) prio=10        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:315)
        at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:198)
    "Async Garbage Collector" (TID:0xee300398, sys_thread_t:0x4b7d8, state:R) prio=1
    "Idle thread" (TID:0xee3003e0, sys_thread_t:0x48400, state:R) prio=0
    "Clock" (TID:0xee300270, sys_thread_t:0x40d38, state:CW) prio=12
    "main" (TID:0xee3002a0, sys_thread_t:0x20a08, state:R) prio=5 *current d*
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:329)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:303)
        at javasoft.sqe.tests.api.java.lang.versioning.AltClassLoader.findMyAppClass(AltClassLoader.java:69)
        at javasoft.sqe.tests.api.java.lang.versioning.AltClassLoader.loadClass(AltClassLoader.java:34)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:176)
        at javasoft.sqe.tests.api.java.lang.versioning.PackageVersioning.main(PackageVersioning.java:44)
Monitor Cache Dump:
Registered Monitor Dump:
    utf8 hash table: <unowned>
    JNI pinning lock: <unowned>
    JNI global reference lock: <unowned>
    BinClass lock: <unowned>
    Class linking lock: <unowned>
    System class loader lock: <unowned>
    Code rewrite lock: <unowned>
    Heap lock: <unowned>
    Monitor IO lock: <unowned>
    Child death monitor: <unowned>
    Event monitor: <unowned>
    I/O monitor: <unowned>
    Alarm monitor: <unowned>
        Waiting to be notified:
            "Clock" (0x40d38)
    Sbrk lock: <unowned>
    Monitor cache expansion lock: <unowned>
    Thread queue lock: <unowned>
    Monitor registry: owner "main" (0x20a08, 1 entry)