SUMMARY:

The following JDK 1.1.1 application will stop with a segmentation violation.

TO REPRODUCE:

javac Popup.java
java Popup

Then press a key twice with the mouse pointer above the
application will then SEGV.

The stack trace is as follows:

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

        stackbase=EFFFEA00, stackpointer=EFFFE530

Full thread dump:
    "AWT-Finalizer" (TID:0xee306238, sys_thread_t:0xede70de0, state:CW) prio=9
        java.lang.Object.wait(Object.java)
        sun.awt.AWTFinalizer.run(AWTFinalizer.java:48)
    "Screen Updater" (TID:0xee306010, sys_thread_t:0xedea0de0, 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:0xee304b40, sys_thread_t:0xedf20de0, state:MW) prio=5
        java.lang.Thread.run(Thread.java)
    "AWT-Input" (TID:0xee304b60, sys_thread_t:0xedf50de0, state:MW) prio=5
    "AWT-EventQueue-0" (TID:0xee304b70, sys_thread_t:0xef040de0, state:CW) prio=5
        java.lang.Object.wait(Object.java)
        java.awt.EventQueue.getNextEvent(EventQueue.java:113)
        java.awt.EventDispatchThread.run(EventDispatchThread.java:55)
    "Finalizer thread" (TID:0xee300220, sys_thread_t:0xef2e0de0, state:CW) prio=1
    "Async Garbage Collector" (TID:0xee3001d8, sys_thread_t:0xef310de0, state:CW) prio=1
    "Idle thread" (TID:0xee300190, sys_thread_t:0xef340de0, state:R) prio=0
    "Clock" (TID:0xee3000d0, sys_thread_t:0xef370de0, state:CW) prio=12
    "main" (TID:0xee3000a8, sys_thread_t:0x40e60, state:R) prio=5 *current thread*
        sun.awt.motif.MComponentPeer.initialize(MComponentPeer.java:66)
        sun.awt.motif.MComponentPeer.<init>(MComponentPeer.java:99)
        sun.awt.motif.MCanvasPeer.<init>(MCanvasPeer.java:39)
        sun.awt.motif.MPanelPeer.<init>(MPanelPeer.java:33)
        sun.awt.motif.MFramePeer.<init>(MFramePeer.java:47)
        sun.awt.motif.MToolkit.createFrame(MToolkit.java:120)
        java.awt.Frame.addNotify(Frame.java:139)
        java.awt.Dialog.show(Dialog.java:178)
        Popup.main(Popup.java:9)
Monitor Cache Dump:
    sun.awt.ScreenUpdater@EE306010/EE356FA0: <unowned>
        Waiting to be notified:
            "Screen Updater"
    <unknown key> (0xef310de0): <unowned>
        Waiting to be notified:
            "Async Garbage Collector"
    java.awt.EventQueue@EE304B20/EE3509B0: <unowned>
        Waiting to be notified:
            "AWT-EventQueue-0"
    java.lang.Object@EE303B50/EE34D390: owner "main" (0x40e60, 1 entry)
    sun.awt.AWTFinalizer@EE306238/EE3572A0: <unowned>
        Waiting to be notified:
            "AWT-Finalizer"
    sun.awt.motif.MToolkit@EE304AF0/EE3508C0: owner "main" (0x40e60, 1 entry)
        Waiting to enter:
            "AWT-Input"
            "AWT-Motif"
Registered Monitor Dump:
    Thread queue lock: <unowned>
    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"
    Monitor IO lock: <unowned>
    Child death monitor: <unowned>
    Event monitor: <unowned>
    I/O monitor: <unowned>
    Alarm monitor: <unowned>
        Waiting to be notified:
            "Clock"
    Sbrk lock: <unowned>
    Monitor cache expansion lock: <unowned>
    Monitor registry: owner "main" (0x40e60, 1 entry)
Thread Alarm Q:
    sys_thread_t 0xef310de0 [Timeout in 454 ms]
Abort (core dumped)

CODE:
 
        import java.awt.*;
        import java.awt.event.*;

        public class Popup extends Dialog implements KeyListener {
            public static void main(String[] a) {
                Popup p = new Popup();
                p.show();
                p = new Popup();
                p.show(); // This causes a segmentation fault.
            }
            Popup() {
                super(new Frame(), true );
                enableEvents(AWTEvent.KEY_EVENT_MASK);
                addKeyListener(this);
            }
            public void keyPressed(KeyEvent ke) {
                dispose();
            }
            public void keyReleased(KeyEvent e) {}
            public void keyTyped(KeyEvent e) {}
        }


stephen.fitch@UK 1998-03-30