The following program crashes during VM shutdown in about 5/1000 runs
with current main/baseline (03/21/02) on Linux:

-------------------------------------------------------
import java.io.*;

public class ShutdownTest extends Thread {
   public void run() {
     while (true) {
       ShutdownTest st = new ShutdownTest();
       if (st == null) {
         System.out.println("st == null");
       }
     }
   }

   public static void main(String args[]) {
     System.out.println("- ShutdownTest -");

     for(int i = 0; i < 4; i++) {
       ShutdownTest st = new ShutdownTest();
       st.setDaemon(true);
       st.start();
     }
   }
}
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Error message:

Unexpected Signal : 11 occurred at PC=0x402A945D during VM shutdown
Function=type__C4Item+0x9
Library=/home/huanghui/jdk1.4.1/jre/lib/i386/client/libjvm.so