Index: sys/kern/kern_event.c
===================================================================
RCS file: /cvsroot/src/sys/kern/kern_event.c,v
retrieving revision 1.109
diff -u -p -r1.109 kern_event.c
--- sys/kern/kern_event.c	11 Dec 2020 03:00:09 -0000	1.109
+++ sys/kern/kern_event.c	18 Dec 2020 11:08:20 -0000
@@ -1575,6 +1575,8 @@ kqueue_scan(file_t *fp, size_t maxevents
 			}
 		}
  done:
+		if (kq->kq_count)
+			cv_broadcast(&kq->kq_cv);
 		mutex_spin_exit(&kq->kq_lock);
 		mutex_exit(&fdp->fd_lock);
 	}