To reproduce, compile and run the attached Test.java. Tear off a menu, then
click the hide button. You should see the following violation:

SIGSEGV 11* segmentation violation
    si_signo [11]: SIGSEGV 11* segmentation violation
    si_errno [0]: Error 0
    si_code [1]: SEGV_ACCERR [addr: 0x6f6c6b7d]
 
        stackbase=EE0EF000, stackpointer=EE0ED418
 
Full thread dump:
    "AWT-Finalizer" (TID:0xee766090, sys_thread_t:0xee066de0, state:CW) prio=9
        java.lang.Object.wait(Object.java)
        sun.awt.AWTFinalizer.run(AWTFinalizer.java:48)
    "Screen Updater" (TID:0xee7657a8, sys_thread_t:0xee088de0, state:CW) prio=4
        java.lang.Object.wait(Object.java)
        sun.awt.ScreenUpdater.nextEntry(ScreenUpdater.java:78)
        sun.awt.ScreenUpdater.run(ScreenUpdater.java:98)
    "AWT-Motif" (TID:0xee763c38, sys_thread_t:0xee0aade0, state:CW) prio=5
        java.lang.Thread.run(Thread.java) "AWT-Input" (TID:0xee763c18, sys_thread_t:0xee0ccde0, state:R) prio=5
    "AWT-EventQueue-0" (TID:0xee763c00, sys_thread_t:0xee0eede0, state:R) prio=5 *current thread*
        sun.awt.motif.MFramePeer.setMenuBar(MFramePeer.java:99)
        java.awt.Frame.remove(Frame.java)
        Test.hide(Test.java:56)
        Test.actionPerformed(Test.java:43)
        java.awt.Button.processActionEvent(Button.java)
        java.awt.Button.processEvent(Button.java)
        java.awt.Component.dispatchEventImpl(Component.java)
        java.awt.EventDispatchThread.run(EventDispatchThread.java)
    "Finalizer thread" (TID:0xee75f220, sys_thread_t:0xee375de0, state:CW) prio=1
    "Async Garbage Collector" (TID:0xee75f1d8, sys_thread_t:0xee397de0, state:R) prio=1
    "Idle thread" (TID:0xee75f190, sys_thread_t:0xee3b9de0, state:R) prio=0
    "Clock" (TID:0xee75f0d0, sys_thread_t:0xee3dbde0, state:CW) prio=12
    "main" (TID:0xee75f0a8, sys_thread_t:0x6db38, state:CW) prio=5
Monitor Cache Dump:
         sun.awt.ScreenUpdater@EE7657A8/EE7B9CD0 (key=0xee7657a8): unowned
        Waiting to be notified:
            "Screen Updater"
         sun.awt.AWTFinalizer@EE766090/EE7B5F10 (key=0xee766090): unowned
        Waiting to be notified:
            "AWT-Finalizer"
         Test@EE7628F0/EE7ABCB8 (key=0xee7628f0): monitor owner ee0eede0: "AWT-EventQueue-0"
         sun.awt.motif.MToolkit@EE763BA0/EE7B1EB0 (key=0xee763ba0): monitor owner ee0eede0: "AWT-EventQueue-0"
        Waiting to be notified:
            "AWT-Motif"
Registered Monitor Dump:
    Thread queue lock: unowned
        Waiting to be notified:
            "main"
    Name and type hash table lock: unowned
    String intern lock: unowned
    JNI global reference lock: unowned
    BinClass lock: unowned
    Class loading lock: unowned
    Java stack lock: unowned
    Code rewrite lock: unowned
    Heap lock: unowned
    Has finalization queue lock: unowned
    Finalize me queue lock: unowned
        Waiting to be notified:
            "Finalizer thread"
    Monitor IO lock: unowned
    Child death monitor: unowned
    Event monitor: unowned
    I/O monitor: monitor owner ee0ccde0: "AWT-Input"
    Alarm monitor: unowned
        Waiting to be notified:
            "Clock"
    Sbrk lock: unowned
    Monitor cache expansion lock: unowned
    Monitor registry: monitor owner ee0eede0: "AWT-EventQueue-0"
Thread Alarm Q:
Abort
$ et/dist/sparc-S2/JDK1.1A/bin/java Test <
Note: Test.java uses a deprecated API. Recompile with "-deprecation" for details.
1 warning
SIGSEGV 11* segmentation violation
    si_signo [11]: SIGSEGV 11* segmentation violation
    si_errno [0]: Error 0
    si_code [1]: SEGV_ACCERR [addr: 0x4]
 
        stackbase=EE0EF000, stackpointer=EE0EE7E8
 
Full thread dump:
    "AWT-Finalizer" (TID:0xee765800, sys_thread_t:0xee066de0, state:CW) prio=9
        java.lang.Object.wait(Object.java)
        sun.awt.AWTFinalizer.run(AWTFinalizer.java:48)
    "Screen Updater" (TID:0xee764ef0, sys_thread_t:0xee088de0, state:CW) prio=4
        java.lang.Object.wait(Object.java)
        sun.awt.ScreenUpdater.nextEntry(ScreenUpdater.java:78)
        sun.awt.ScreenUpdater.run(ScreenUpdater.java:98)
    "AWT-Motif" (TID:0xee7639e0, sys_thread_t:0xee0aade0, state:CW) prio=5
        java.lang.Thread.run(Thread.java)
    "AWT-Input" (TID:0xee763a50, sys_thread_t:0xee0ccde0, state:R) prio=5
    "AWT-EventQueue-0" (TID:0xee763a98, sys_thread_t:0xee0eede0, state:R) prio=5 *current thread*
        sun.awt.motif.MFramePeer.setMenuBar(MFramePeer.java:99)
        java.awt.Frame.remove(Frame.java)
        Test.hide(Test.java:56)
        Test.actionPerformed(Test.java:43)
        java.awt.Button.processActionEvent(Button.java)
        java.awt.Button.processEvent(Button.java)
        java.awt.Component.dispatchEventImpl(Component.java)
        java.awt.EventDispatchThread.run(EventDispatchThread.java)
    "Finalizer thread" (TID:0xee75f220, sys_thread_t:0xee375de0, state:CW) prio=1
    "Async Garbage Collector" (TID:0xee75f1d8, sys_thread_t:0xee397de0, state:CW) prio=1
    "Idle thread" (TID:0xee75f190, sys_thread_t:0xee3b9de0, state:R) prio=0
    "Clock" (TID:0xee75f0d0, sys_thread_t:0xee3dbde0, state:CW) prio=12
    "main" (TID:0xee75f0a8, sys_thread_t:0x6db38, state:CW) prio=5
Monitor Cache Dump:
         Test@EE7628F0/EE7AC6F8 (key=0xee7628f0): monitor owner ee0eede0: "AWT-EventQueue-0"
         sun.awt.AWTFinalizer@EE765800/EE7B5EF8 (key=0xee765800): unowned
        Waiting to be notified:
            "AWT-Finalizer"
         sun.awt.ScreenUpdater@EE764EF0/EE7B9CB8 (key=0xee764ef0): unowned
        Waiting to be notified:
            "Screen Updater"
         unknown key (key=0xee397de0): unowned
        Waiting to be notified:
            "Async Garbage Collector"
         sun.awt.motif.MToolkit@EE763BA0/EE7B0A90 (key=0xee763ba0): monitor owner ee0eede0: "AWT-EventQueue-0"
        Waiting to be notified:
            "AWT-Motif"
Registered Monitor Dump:
    Thread queue lock: unowned
        Waiting to be notified:
            "main"
    Name and type hash table lock: unowned
    String intern lock: unowned
    JNI global reference lock: unowned
    BinClass lock: unowned
    Class loading lock: unowned
    Java stack lock: unowned
    Code rewrite lock: unowned
    Heap lock: unowned
    Has finalization queue lock: unowned
    Finalize me queue lock: unowned
        Waiting to be notified:
            "Finalizer thread"
    Monitor IO lock: unowned
    Child death monitor: unowned
    Event monitor: unowned
    I/O monitor: monitor owner ee0ccde0: "AWT-Input"
    Alarm monitor: unowned
        Waiting to be notified:
            "Clock"
    Sbrk lock: unowned
    Monitor cache expansion lock: unowned
    Monitor registry: monitor owner ee0eede0: "AWT-EventQueue-0"
Thread Alarm Q:
    sys_thread_t 0xee397de0 [Timeout in 415 ms]
Abort