This program sets up a grid of buttons and repeatedly sets the labels on them.
It runs perfectly on Windows 95; I have run it for days at a time.

On a much more powerful Solaris Ultra system it pauses, freezes, and appears to
hang, sometimes within as few as 5 seconds. (always within 60 secs).
Sometimes it recovers from the hang, usually not. It's awful that it works
on Windows but bombs on Solaris.
If you think a 9x9 grid of buttons is unreasonable (why?) you can see the
same behavior on smaller grids with "java d 5"

    compile with javac d.java

    run with java d

// test case for bug NNNNNNN - Peter van der Linden ###@###.###

import java.awt.*;

public class d extends Panel {
    static Button l[][];
    static int i=9, j=9; // size of grid, i is rows, j is cols

    public static boolean changeLabels() {
       for ( ;; )
           for (int row=0; row < i; row++)
               for (int m=0; m < j; m++)
                  l[row][m].setLabel( "A" );
    }


    public static void main(String args[]) {
        if (args.length == 1) { // grid of a different size
           i = j = Integer.parseInt(args[0].trim());
        }

        d f = new d();
        f.setLayout( new GridLayout(i,j) );
        f.setSize(400,400);
        f.setVisible(true);
        l = new Button[i][j];

        for (i=0; i<l.length; i++) {
            for (j=0; j<l[0].length; j++) {
                f.add( l[i][j] = new Button("") );
                l[i][j].setBackground(Color.white);
                l[i][j].setForeground(Color.black);
            }
        }
        Frame holder = new Frame(" ");
        holder.setSize(410,410);
        holder.setVisible(true);
        holder.add(f);
        holder.invalidate();
        holder.validate();

        f.changeLabels();
    }
}