Index: bpf.c
===================================================================
RCS file: /cvs/src/sys/net/bpf.c,v
retrieving revision 1.203
diff -u -p -r1.203 bpf.c
--- bpf.c	21 Jan 2021 12:33:14 -0000	1.203
+++ bpf.c	22 Apr 2021 03:09:27 -0000
@@ -1690,8 +1690,10 @@ bpfsdetach(void *p)
 		if (cdevsw[maj].d_open == bpfopen)
 			break;
 
-	while ((bd = SMR_SLIST_FIRST_LOCKED(&bp->bif_dlist)))
+	while ((bd = SMR_SLIST_FIRST_LOCKED(&bp->bif_dlist))) {
 		vdevgone(maj, bd->bd_unit, bd->bd_unit, VCHR);
+		klist_invalidate(&bd->bd_sel.si_note);
+	}
 
 	for (tbp = bpf_iflist; tbp; tbp = tbp->bif_next) {
 		if (tbp->bif_next == bp) {