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
@@ -375,6 +375,7 @@
 	 * Stop the real interval timer.  If the handler is currently
 	 * executing, prevent it from rearming itself and let it finish.
 	 */
+	p->p_flag2 &= ~P2_ITSTOPPED;
 	if (timevalisset(&p->p_realtimer.it_value) &&
 	    callout_stop(&p->p_itcallout) == 0) {
 		timevalclear(&p->p_realtimer.it_interval);
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
@@ -884,6 +884,8 @@
 {
 	sbintime_t prec;
 
+	if ((p->p_flag & P_WEXIT) != 0)
+		return;
 	prec = isbtp == NULL ? tvtosbt(p->p_realtimer.it_interval) : *isbtp;
 	callout_reset_sbt(&p->p_itcallout, tvtosbt(p->p_realtimer.it_value),
 	    prec >> tc_precexp, realitexpire, p, C_ABSOLUTE);