diff --git a/sys/kern/tty.c b/sys/kern/tty.c
--- a/sys/kern/tty.c
+++ b/sys/kern/tty.c
@@ -403,6 +403,11 @@
 	cv_broadcast(&tp->t_bgwait);
 	cv_broadcast(&tp->t_dcdwait);
 
+	if (fflag & FREVOKE) {
+		knlist_delete(&tp->t_inpoll.si_note, curthread, 1);
+		knlist_delete(&tp->t_outpoll.si_note, curthread, 1);
+	}
+
 	ttydev_leave(tp);
 
 	return (0);