This bug was found during I18N testing running TextEditor, one of Cindy's regression tools. I've isolated the code to the following lines:

import java.awt.*;
import java.awt.event.*;

public class Test {
    public static void main(String args[]) {
Frame f = new Frame("Test");
MenuBar mb = new MenuBar();
f.setMenuBar(mb);
f.show();
    }
}




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=EFFFE598

Full thread dump:
    "AWT-Motif" (TID:0xee303ec8, sys_thread_t:0x3f74c4, state:CW) prio=5
        at java.lang.Object.wait(Native Method)
        at sun.awt.motif.MToolkit.run(Native Method)
        at java.lang.Thread.run(Thread.java:484)
    "AWT-Input" (TID:0xee303ef0, sys_thread_t:0x3f0e2c, state:R) prio=5
        at sun.awt.motif.InputThread.run(Native Method)
    "AWT-EventQueue-0" (TID:0xee303ce8, sys_thread_t:0x3dc344, state:CW) prio=5
        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:309)
        at java.awt.EventQueue.getNextEvent(EventQueue.java:114)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:44)
    "CachedReference sweeper" (TID:0xee300d30, sys_thread_t:0x67c84, state:CW) prio=9
        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:309)
        at java.lang.Runtime.waitForMemoryAdvice(Runtime.java:569)
        at java.lang.ref.CachedReference$Sweeper.run(CachedReference.java:342)
        at java.lang.Thread.run(Thread.java:484)
    "Finalizer" (TID:0xee300368, sys_thread_t:0x4c7c4, state:CW) prio=8
        at java.lang.Object.wait(Native Method)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:86)
        at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:99)
        at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:131)
    "Reference handler" (TID:0xee300438, sys_thread_t:0x52d3c, state:CW) prio=10
        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:309)
        at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:198)
    "Async Garbage Collector" (TID:0xee3001f8, sys_thread_t:0x478a4, state:CW) prio=1
    "Idle thread" (TID:0xee300240, sys_thread_t:0x4779c, state:R) prio=0
    "Clock" (TID:0xee300088, sys_thread_t:0x48104, state:CW) prio=12
    "main" (TID:0xee3000b0, sys_thread_t:0x209fc, state:R) prio=5 *current thread*
        at sun.awt.motif.MFramePeer.pSetMenuBar(Native Method)
        at sun.awt.motif.MFramePeer.setMenuBar(MFramePeer.java:159)
        at java.awt.Frame.addNotify(Frame.java:173)
        at java.awt.Window.show(Window.java:167)
        at Test.main(Test.java:9)
Monitor Cache Dump:
    sun.awt.motif.MToolkit@EE303D68/EE36B9B0: owner "main" (0x209fc, 1 entry)
        Waiting to be notified:
            "AWT-Motif" (0x3f74c4)
Registered Monitor Dump:
    utf8 hash table: <unowned>
    JNI pinning lock: <unowned>
    JNI global reference lock: <unowned>
    BinClass lock: <unowned>
    Class linking lock: <unowned>
    Code rewrite lock: <unowned>
    Heap lock: <unowned>
    Monitor IO lock: <unowned>
    Child death monitor: <unowned>
    Event monitor: <unowned>
    I/O monitor: owner "AWT-Input" (0x3f0e2c, 1 entry)
    Alarm monitor: <unowned>
        Waiting to be notified:
            "Clock" (0x48104)
    Sbrk lock: <unowned>
    Monitor cache expansion lock: <unowned>
    Thread queue lock: <unowned>
    Monitor registry: owner "main" (0x209fc, 1 entry)
Thread Alarm Q:
    sys_thread_t 0x3f74c4 [Timeout in 56 ms]
    sys_thread_t 0x3f0e2c [Timeout in 202 ms]
    sys_thread_t 0x478a4 [Timeout in 426 ms]
Abort


The TextEditor (see Attachments) core dump still occurs (please see the attachment for the core file)