diff -ruN kozos08/telnetd.c kozos09/telnetd.c
--- kozos08/telnetd.c	Sun Nov  4 11:27:46 2007
+++ kozos09/telnetd.c	Sun Nov  4 11:27:46 2007
@@ -13,6 +13,7 @@
 #define PORT 20001
 
 int telnetd_id;
+int telnetd_dummy;
 
 static int command_main(int s, char *argv[])
 {
@@ -41,6 +42,9 @@
 
     if (!strncmp(buffer, "echo", 4)) {
       write(s, buffer + 4, strlen(buffer + 4));
+    } else if (!strncmp(buffer, "break", 5)) {
+      int *nullp = NULL;
+      *nullp = 1;
     } else if (!strncmp(buffer, "date", 4)) {
       time_t t;
       t = time(NULL);
@@ -51,7 +55,7 @@
       int i;
       for (i = 0; i < THREAD_NUM; i++) {
 	thp = &threads[i];
-	if (!thp->id) break;
+	if (!thp->id) continue;
 	write(s, thp->name, strlen(thp->name));
 	write(s, "\n", 1);
       }
diff -ruN kozos08/thread.c kozos09/thread.c
--- kozos08/thread.c	Sun Nov  4 11:27:46 2007
+++ kozos09/thread.c	Sun Nov  4 11:27:46 2007
@@ -398,9 +398,12 @@
   case SIGTRAP:
   case SIGILL:
     {
-      fprintf(stderr, "error %s\n", current->name);
+      fprintf(stderr, "error thread \"%s\"\n", current->name);
       /* ダウン要因発生により継続不可能なので，スリープ状態にする*/
       getcurrent();
+#if 1 /* スレッド終了する */
+      thread_exit();
+#endif
     }
     break;
   default:
@@ -434,6 +437,10 @@
   signal(SIGSYS, thread_intr);
   signal(SIGHUP, thread_intr);
   signal(SIGALRM, thread_intr);
+  signal(SIGBUS, thread_intr);
+  signal(SIGSEGV, thread_intr);
+  signal(SIGTRAP, thread_intr);
+  signal(SIGILL, thread_intr);
 
   /*
    * current 未定のためにシステムコール発行はできないので，