fp.bugs 2479: Solaris only: calling setMenuBar() show() twice causes SIGSEGV

###@###.### (Robert Uomini)

Solaris only: Calling setMenuBar() then show() twice causes SIGSEGV.

Steps to reproduce
Compile and run the following code
Select File | New
Select Edit | Copy
// note: receive following error:

SIGSEGV 11* segmentation violation
    si_signo [11]: SIGSEGV 11* segmentation violation
    si_errno [0]: Error 0
    si_code [1]: SEGV_ACCERR [addr: 0x1d]

stackbase=EF2BE000, stackpointer=EF2BCD28

Full thread dump:
    "Screen Updater" (TID:0xee300b28, sys_thread_t:0xef1bdde8) prio=4
java.lang.Object.wait(Object.java)
sun.awt.ScreenUpdater.nextEntry(ScreenUpdater.java:76)
sun.awt.ScreenUpdater.run(ScreenUpdater.java:96)
    "AWT-Motif" (TID:0xee3009c0, sys_thread_t:0xef2bdde8) prio=5 *current thread*
sun.awt.motif.MFramePeer.toFront(MFramePeer.java:103)
java.awt.Window.toFront(Window.java:120)
java.awt.Window.show(Window.java:98)
ChangeMenu.menuEvent(ChangeMenu.java:42)
AppFrame.action(AppFrame.java:41)
java.awt.Component.handleEvent(Component.java:886)
AppFrame.handleEvent(AppFrame.java:33)
java.awt.Component.postEvent(Component.java:832)
java.awt.MenuComponent.postEvent(MenuComponent.java:94)
java.awt.MenuComponent.postEvent(MenuComponent.java:94)
java.awt.MenuComponent.postEvent(MenuComponent.java:94)
sun.awt.motif.MMenuItemPeer.action(MMenuItemPeer.java:44)
java.lang.Thread.run(Thread.java)
    "AWT-Input" (TID:0xee3009a0, sys_thread_t:0xef47dde8) prio=5
    "Finalizer thread" (TID:0xee3002e8, sys_thread_t:0xef537de8) prio=1
    "Async Garbage Collector" (TID:0xee300298, sys_thread_t:0xef55ade8) prio=1
    "Idle thread" (TID:0xee300228, sys_thread_t:0xef57dde8) prio=0
    "clock handler" (TID:0xee300070, sys_thread_t:0xef63dde8) prio=11
    "main" (TID:0xee300030, sys_thread_t:0x81ad8) prio=5
Monitor Cache Dump:
    ChangeMenu@EE300448/EE334558 (key=0xee300448): monitor owner: "AWT-Motif"
    unknown key (key=0xef55ade8): unowned
Waiting to be notified:
"Async Garbage Collector"
    sun.awt.ScreenUpdater@EE300B28/EE335A40 (key=0xee300b28): unowned
Waiting to be notified:
"Screen Updater"
    sun.awt.motif.MToolkit@EE300988/EE335360 (key=0xee300988): monitor owner: "AWT-Motif"
Waiting to be notified:
"AWT-Input"
    unknown key (key=0xef2222a0): monitor owner: "main"
Registered Monitor Dump:
    Finalize me queue lock: unowned
Waiting to be notified:
"Finalizer thread"
    Thread queue lock: unowned
Waiting to be notified:
"main"
    Class lock: unowned
    Java stack lock: unowned
    Code rewrite lock: unowned
    Heap lock: unowned
    Has finalization queue 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 handler"
  Sbrk lock: unowned
    Monitor cache lock: unowned
    Monitor registry: monitor owner: "AWT-Motif"
Thread Alarm Q:
    sys_thread_t 0xef55ade8 [Timeout in 452 ms]
Segmentation Fault (core dumped)


****** Source Code here ******

/* Tests changing a menu bar */

import java.awt.*;

class ChangeMenu extends AppFrame
{
    private MenuBar fileMenu;
    private MenuBar editMenu;

    public ChangeMenu(String name)
    {
       super(name);
    
       // set new MenuBar
       fileMenu = new MenuBar();
       fileMenu.add(new FileMenu("File"));
       setMenuBar(fileMenu);

       editMenu = new MenuBar();
       editMenu.add( new EditMenu("Edit") );

       resize(200, 200);

    }
    

    public boolean menuEvent(Event evt, Object obj)
    {

       String label = (String) obj;
       if (label.equals("New") )
       {
          remove(fileMenu);
          setMenuBar(editMenu);
          show();
          return true;
       }
       else if (label.equals("Copy") )
       {
          remove(editMenu);
          setMenuBar(fileMenu);
          show();
          return true;
       }
       else
          return super.menuEvent(evt, obj);
    }


    public static void main(String args[])
    {
       ChangeMenu x = new ChangeMenu("Change Menu Test");
       x.show();
    }
}



/* Generic Full Application Frame
 * @(#)AppFrame.java 1.4 15 Nov 1995 15:48:24
 * @author Kevin A. Smith
 *
 * The class AppFrame provides an AWT Frame window for running
 * applications.
 *
 */

import java.awt.Frame;
import java.awt.Event;
import java.awt.MenuItem;

// Application Frame window
class AppFrame extends Frame
{
    // constructor needed to pass window title to class Frame
    public AppFrame(String name)
    {
       // call java.awt.Frame(String) constructor
       super(name);
    }

    // needed to allow window close
    public boolean handleEvent(Event e)
    {
       // Window Destroy event
       if (e.id == Event.WINDOW_DESTROY)
          return appExit(0);
       
       // it's good form to let the super class look at any
       // unhandled events
       return super.handleEvent(e);

    } // end handleEvent()

    // Generic Action event handler
    public boolean action(Event evt, Object obj)
    {
       if(evt.target instanceof MenuItem)
          return menuEvent(evt, obj);
       else
          // it is good form to let the super class look at any
          // unhandled events.
          return super.action(evt, obj);

    } // end action()

    // Generic Menu event handler
    public boolean menuEvent(Event evt, Object obj)
    {
       String menuLabel = obj.toString();

       if( menuLabel.equals("Exit") )
       {
          // This menu item is the same as Close
          return appExit(0);
       }

       else
          // menu event handler did nothing with this event.
          // In a fully written application, you should never
          // get to this line.
          return false;

    } // end menuEvent()

    // application exit code
    protected boolean appExit(int exitCode)
    {
       System.exit(exitCode);
       return true;
    }

} // end class AppFrame




/* Main Menu bar
 *
 */

import java.awt.MenuItem;
import java.awt.Menu;

public class FileMenu extends Menu
{
    // standard menu item labels
    public final String EXIT = "Exit";
    public final String NEW = "New";
    public final String OPEN = "Open";


    public FileMenu(String menuName)
    {
       super(menuName);
       add(new MenuItem(NEW));
       add(new MenuItem(OPEN));
       addSeparator();
       add(new MenuItem(EXIT));

    }

}

class EditMenu extends Menu
{
    public final String COPY = "Copy";
    
    public EditMenu(String menuName)
    {
       super(menuName);
       add(new MenuItem(COPY) );
       addSeparator();
    }
}