--- kernel/kern/thread.c	2018/04/24 18:26:07	1.1
+++ kernel/kern/thread.c	2018/04/24 18:32:37	1.1.1.2
@@ -494,7 +494,7 @@ kern_return_t thread_create(
 	 */
 	new_thread->_uthread = (struct uthread *) zalloc(u_thread_zone);
 
-//	uarea_zero(new_thread);		/* XXX */
+	uarea_zero(new_thread->_uthread);
 //	uarea_init(new_thread);
 
 	/*
@@ -1807,7 +1807,21 @@ void reaper_thread_continue(void)
 
 void reaper_thread(void)
 {
-	current_thread()->vm_privilege = TRUE;
+	thread_t th = current_thread();
+
+	/*
+	 * make reaper a high priority thread
+	 * with fix priority scheduling policy
+	 */
+	th->priority = BASEPRI_SYSTEM + 3; 
+	th->sched_pri = BASEPRI_SYSTEM + 3;
+	th->policy = POLICY_FIXEDPRI;
+	th->vm_privilege = TRUE;
+	th->sched_data = min_quantum * 4;
+
+	/* Dedicate a stack for the reaper */
+	stack_privilege(th);
+
 	reaper_thread_continue();
 	/*NOTREACHED*/
 }