chosho.kyo@japan 1998-11-12
(1) Working environments
OS : Solaris2.5.1J, 2.6J
JRE : JRE1.1.6fcs

(2) Phenomenon
    Frame disposal on a repeated loop causes crashes.
    Running the following source Frame1.java can see the crash.
    Thread dump message and stack trace info are also attached below
    for analysis.
    
(3) Reproducible Source
//------------Frame1.java---------

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

public class Frame1 extends Frame {
    Button button1 = new Button();
    CheckboxGroup checkboxGroup1 = new CheckboxGroup();
    Checkbox checkbox1 = new Checkbox();
    Checkbox checkbox2 = new Checkbox();
    Choice choice1 = new Choice();
    Label label1 = new Label();
    List list1 = new List();
    MenuBar menuBar1 = new MenuBar();
    PopupMenu popupMenu1 = new PopupMenu("popup");
    MenuItem menuItem2 = new MenuItem("menuItem2");
    Panel panel1 = new Panel();
    Scrollbar scrollbar1 = new Scrollbar();
    TextArea textArea1 = new TextArea();
    TextField textField1 = new TextField();
    Label label2 = new Label();
    ScrollPane scrollPane1 = new ScrollPane();
    Panel panel2 = new Panel();
    Button button2 = new Button();
    Button button3 = new Button();
    Menu menu1 = new Menu("menu1");
    MenuItem menuItem1 = new MenuItem("menuItem1");
    Canvas canvas1 = new Canvas();
    BorderLayout borderLayout1 = new BorderLayout();
    Button button4 = new Button();


    public Frame1() {
        try {
            jbInit();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Frame1 frame11 = new Frame1();
        frame11.setVisible(true);
    }

    private void jbInit() throws Exception {
        this.setSize(new Dimension(464, 499));
        button1.setBounds(new Rectangle(23, 85, 49, 45));
        button1.setLabel("open");
        button1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(ActionEvent e) {
                button1_actionPerformed(e);
            }
        });
        checkbox1.setBounds(new Rectangle(24, 145, 88, 23));
        checkbox1.setLabel("checkbox1");
        checkbox1.setCheckboxGroup(checkboxGroup1);
        checkbox1.addItemListener(new java.awt.event.ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                checkbox1_itemStateChanged(e);
            }
        });
        checkbox2.setBounds(new Rectangle(128, 146, 88, 23));
        checkbox2.setLabel("checkbox2");
        checkbox2.setCheckboxGroup(checkboxGroup1);
        checkboxGroup1.setSelectedCheckbox(checkbox1);
        choice1.setBounds(new Rectangle(32, 190, 154, 25));
        choice1.addItemListener(new java.awt.event.ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                choice1_itemStateChanged(e);
            }
        });
        menuItem2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(ActionEvent e) {
                menuItem2_actionPerformed(e);
            }
        });
        scrollPane1.setBounds(new Rectangle(319, 352, 111, 77));
        panel2.setLayout(borderLayout1);
        button2.setBounds(new Rectangle(80, 86, 48, 45));
        button2.setLabel("close");
        button3.setBounds(new Rectangle(132, 85, 102, 47));
        button3.setLabel("System.gc()");
        button4.setBounds(new Rectangle(240, 87, 45, 44));
        button4.setLabel("auto");
        button4.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(ActionEvent e) {
                button4_actionPerformed(e);
            }
        });
        canvas1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(MouseEvent e) {
                canvas1_mouseClicked(e);
            }
        });
        menuItem1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(ActionEvent e) {
                menuItem1_actionPerformed(e);
            }
        });
        button3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(ActionEvent e) {
                button3_actionPerformed(e);
            }
        });
        button2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(ActionEvent e) {
                button2_actionPerformed(e);
            }
        });
        choice1.add("choice 1");
        choice1.add("choice 2");
        label1.setBounds(new Rectangle(33, 248, 162, 43));
        label1.setText("label1");
        list1.setBounds(new Rectangle(248, 245, 112, 68));
        list1.addItemListener(new java.awt.event.ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                list1_itemStateChanged(e);
            }
        });
        panel1.setBounds(new Rectangle(32, 364, 137, 64));
        scrollbar1.setBounds(new Rectangle(231, 357, 20, 76));
        scrollbar1.addAdjustmentListener(new java.awt.event.AdjustmentListener() {
            public void adjustmentValueChanged(AdjustmentEvent e) {
                scrollbar1_adjustmentValueChanged(e);
            }
        });
        textArea1.setBounds(new Rectangle(307, 87, 124, 110));
        textArea1.setText("textArea1");
        textField1.setBounds(new Rectangle(33, 302, 155, 27));
        textField1.setText("textField1");
        textField1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(ActionEvent e) {
                textField1_actionPerformed(e);
            }
        });
        label2.setText("this is panel");
        this.setLayout(null);
        this.add(button1, null);
        this.add(checkbox1, null);
        this.add(checkbox2, null);
        this.add(choice1, null);
        this.add(label1, null);
        list1.add("list1");
        list1.add("list2");
        this.add(list1, null);
        this.add(panel1, null);
        panel1.add(label2, null);
        this.add(scrollbar1, null);
        this.add(textArea1, null);
        this.add(textField1, null);
        this.add(scrollPane1, null);
        scrollPane1.add(panel2, null);
        panel2.add(canvas1);
        this.add(button2, null);
        this.add(button3, null);
        this.add(button4, null);
        menu1.add(menuItem1);
        menuBar1.add(menu1);
        this.setMenuBar(menuBar1);
        this.add(popupMenu1);
        popupMenu1.add(menuItem2);
    }
    public void finalize(){
        //System.out.println("finalize called");

    }

    void button1_actionPerformed(ActionEvent e) {
        Frame1 frame1 = new Frame1();
        frame1.setVisible(true);

    }

    void button2_actionPerformed(ActionEvent e) {
        this.dispose();
        System.gc();
    }

    void button3_actionPerformed(ActionEvent e) {
        System.gc();
    }

    void menuItem1_actionPerformed(ActionEvent e) {
        System.out.println("menuItem1_actionPerformed");
    }

    void canvas1_mouseClicked(MouseEvent e) {
        popupMenu1.show(canvas1, e.getX(), e.getY());
    }

    void menuItem2_actionPerformed(ActionEvent e) {
        System.out.println("menuItem2_actionPerformed");
    }

    void choice1_itemStateChanged(ItemEvent e) {
        System.out.println("choice1_itemStateChanged");
    }

    void checkbox1_itemStateChanged(ItemEvent e) {
        System.out.println("checkbox1_itemStateChanged");
    }

    void list1_itemStateChanged(ItemEvent e) {
        System.out.println("list1_itemStateChanged");
    }

    void textField1_actionPerformed(ActionEvent e) {
        System.out.println("textField1_actionPerformed");
    }

    void scrollbar1_adjustmentValueChanged(AdjustmentEvent e) {
        System.out.println("scrollbar1_adjustmentValueChanged");
    }

    void button4_actionPerformed(ActionEvent e) {

        new AutoExec();
    }
}

class AutoExec extends Thread{
    public AutoExec(){
        this.start();
    }
    public void run(){
        for(int i = 0; i < 2002; i++){
            Frame1 f = new Frame1();
            f.setVisible(true);
            f.dispose();
            System.gc();
            if(i % 200 == 0){
                System.out.println(Integer.toString(i+1));
            }

        }
    }

}

//-----------------Frame1.java End-----------------------

(4) Thread Dump & Stack Trace
-----------------Thread Dump Begin-------------------------------------------
SIGSEGV 11* segmentation violation
    si_signo [11]: SIGSEGV 11* segmentation violation
    si_errno [0]: Error 0
    si_code [1]: SEGV_MAPERR [addr: 0x15]

        stackbase=EF0D2000, stackpointer=EF0D1668

Full thread dump:
    "Thread-4" (TID:0xee307690, sys_thread_t:0xef041db8, state:MW) prio=5
        sun.awt.motif.MFramePeer.setMenuBar(MFramePeer.java:112)
        java.awt.Frame.remove(Frame.java:349)
        java.awt.Frame.dispose(Frame.java:378)
        AutoExec.run(Frame1.java:232)
    "AWT-Finalizer" (TID:0xee307b20, sys_thread_t:0xef071db8, state:CW) prio=9
        java.lang.Object.wait(Object.java)
        sun.awt.AWTFinalizer.run(AWTFinalizer.java:48)
    "Screen Updater" (TID:0xee3076e8, sys_thread_t:0xef0a1db8, 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:0xee305908, sys_thread_t:0xef0d1db8, state:R) prio=5 *current thread*
        java.lang.Thread.run(Thread.java)
    "AWT-Input" (TID:0xee305928, sys_thread_t:0xef101db8, state:CW) prio=5
    "AWT-EventQueue-0" (TID:0xee305940, sys_thread_t:0xef131db8, state:MW) prio=5
        sun.awt.motif.MComponentPeer.handleEvent(MComponentPeer.java:185)
        java.awt.Component.dispatchEventImpl(Component.java:1834)
        java.awt.Component.dispatchEvent(Component.java:1708)
        java.awt.EventDispatchThread.run(EventDispatchThread.java:81)
    "Finalizer thread" (TID:0xee300208, sys_thread_t:0xef341db8, state:CW) prio=1
    "Async Garbage Collector" (TID:0xee300250, sys_thread_t:0xef371db8, state:CW) prio=1
    "Idle thread" (TID:0xee300298, sys_thread_t:0xef471db8, state:R) prio=0
    "Clock" (TID:0xee300088, sys_thread_t:0xef541db8, state:CW) prio=12
    "main" (TID:0xee3000b0, sys_thread_t:0x38c00, state:CW) prio=5
Monitor Cache Dump:
    java.lang.Object@EE303FA0/EE34D9F0: owner "Thread-4" (0xef041db8, 2 entries)
        Waiting to enter:
            "AWT-EventQueue-0" (0xef131db8)
    sun.awt.motif.MToolkit@EE305708/EE352EF8: owner "AWT-Motif" (0xef0d1db8, 1 entry)
        Waiting to enter:
            "Thread-4" (0xef041db8)
        Waiting to be notified:
            "AWT-Input" (0xef101db8)
    sun.awt.AWTFinalizer@EE307B20/EE35B0F8: <unowned>
        Waiting to be notified:
            "AWT-Finalizer" (0xef071db8)
    <unknown key> (0xef371db8): <unowned>
        Waiting to be notified:
            "Async Garbage Collector" (0xef371db8)
    sun.awt.ScreenUpdater@EE3076E8/EE35AD38: <unowned>
        Waiting to be notified:
            "Screen Updater" (0xef0a1db8)
Registered Monitor Dump:
    Thread queue lock: <unowned>
        Waiting to be notified:
            "main" (0x38c00)
    Name and type hash table lock: <unowned>
    String intern lock: <unowned>
    JNI pinning 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" (0xef341db8)
    Monitor IO lock: <unowned>
    Child death monitor: <unowned>
    Event monitor: <unowned>
    I/O monitor: <unowned>
    Alarm monitor: <unowned>
        Waiting to be notified:
            "Clock" (0xef541db8)
    Sbrk lock: <unowned>
    Monitor registry: owner "AWT-Motif" (0xef0d1db8, 1 entry)
Thread Alarm Q:
    sys_thread_t 0xef371db8 [Timeout in 480 ms]
Abort (core dumped)
-----------------Thread Dump End-------------------------------------------

------------------Stack Trace Begin---------------------------------------
=>[1] _lwp_kill(0x0, 0x6, 0x7d, 0xef0d1668, 0xef40df88, 0x0), at 0xef3b952c
  [2] sysAbort(0x0, 0xef0d2000, 0xef0d0f80, 0xb, 0x0, 0x0), at 0xef70c924
  ---- called from signal handler with signal 11 (SIGSEGV) ------
  [3] XtGetValues(), at 0xef1b2748
  [4] XtVaGetValues(0x19fb30, 0xef1f016c, 0x0, 0x241f78, 0x0, 0xef0d141c), at 0xef1daa94
  [5] setMbAndWwHeightAndOffsets(0xef1df2f5, 0x2190d8, 0xef1df184, 0xef1df1f2, 0xee30ef20, 0x6c), at 0xef232c48
  [6] reshape(0xee30ef20, 0x2190d8, 0x0, 0x0, 0x1d0, 0x1), at 0xef234738
  [7] shellEH(0xfffffffe, 0x0, 0xef0d1744, 0x5, 0xee391af0, 0x2190d8), at 0xef2333e4
  [8] XtDispatchEventToWidget(0x0, 0xef0d1744, 0xef0d15f4, 0xef0d1604, 0x0, 0x2), at 0xef1ace98
  [9] _XtDefaultDispatcher(0xef0d1744, 0x0, 0x15, 0xee3d4, 0x0, 0x22f6f8), at 0xef1ad9b4
  [10] XtDispatchEvent(0xef0d1744, 0x0, 0xef1ad7f4, 0xef1f016c, 0x0, 0x1), at 0xef1ade3c
  [11] XtAppProcessEvent(0xf1140, 0x0, 0xef228b70, 0x1, 0xef1f016c, 0x0), at 0xef1bbc4c
  [12] awt_MToolkit_loop(0x972b0, 0xef26cc94, 0xef2600e8, 0xef264684, 0xef26cc14, 0x1), at 0xef228dac
  [13] sun_awt_motif_MToolkit_run(0xef26cc94, 0xef2600f8, 0xef736808, 0x10, 0x2, 0x49), at 0xef228e6c
  [14] Java_sun_awt_motif_MToolkit_run_stub(0x109298, 0xef0d1c6c, 0x0, 0x0, 0x58b70, 0x0), at 0xef24a934
  [15] invokeNativeMethod(0x109270, 0xfa9f0, 0x109298, 0xef0d1c6c, 0xef6d5ae4, 0xee3000b8), at 0xef6d5f7c
  [16] finish_invokevirtual(0x5a913, 0xef0d1c6c, 0x109298, 0x10926c, 0x587a0, 0x109270), at 0xef7162e0
  [17] do_execute_java_method_vararg(0xef0d1c6c, 0xef733c21, 0x0, 0x0, 0x0, 0x109230), at 0xef6e7688
  [18] execute_java_dynamic_method(0xef0d1c6c, 0xee305908, 0xef733c1c, 0xef733c20, 0xef737000, 0x0), at 0xef6e6d2c
  [19] ThreadRT0(0xee305908, 0xef733c20, 0x0, 0x0, 0x0, 0x0), at 0xef701a34
  [20] start_func(0xef71e800, 0xee305908, 0xef7019dc, 0x0, 0x0, 0x0), at 0xef714a94
------------------Stack Trace end-------------------------------------