diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
--- a/sys/kern/kern_exit.c
+++ b/sys/kern/kern_exit.c
@@ -369,15 +369,14 @@
 	 * executing, prevent it from rearming itself and let it finish.
 	 */
 	if (timevalisset(&p->p_realtimer.it_value) &&
-	    _callout_stop_safe(&p->p_itcallout, CS_EXECUTING, NULL) == 0) {
+	    callout_stop(&p->p_itcallout) == 0) {
 		timevalclear(&p->p_realtimer.it_interval);
-		msleep(&p->p_itcallout, &p->p_mtx, PWAIT, "ritwait", 0);
-		KASSERT(!timevalisset(&p->p_realtimer.it_value),
-		    ("realtime timer is still armed"));
+		PROC_UNLOCK(p);
+		callout_drain(&p->p_itcallout);
+	} else {
+		PROC_UNLOCK(p);
 	}
 
-	PROC_UNLOCK(p);
-
 	if (p->p_sysent->sv_onexit != NULL)
 		p->p_sysent->sv_onexit(p);
 	seltdfini(td);
diff --git a/sys/kern/kern_time.c b/sys/kern/kern_time.c
--- a/sys/kern/kern_time.c
+++ b/sys/kern/kern_time.c
@@ -950,8 +950,6 @@
 	kern_psignal(p, SIGALRM);
 	if (!timevalisset(&p->p_realtimer.it_interval)) {
 		timevalclear(&p->p_realtimer.it_value);
-		if (p->p_flag & P_WEXIT)
-			wakeup(&p->p_itcallout);
 		return;
 	}