Index: sys/kern/vfs_mountroot.c
===================================================================
--- sys/kern/vfs_mountroot.c
+++ sys/kern/vfs_mountroot.c
@@ -166,9 +166,6 @@
 {
 	struct root_hold_token *h;
 
-	if (root_mounted())
-		return (NULL);
-
 	h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK);
 	h->who = identifier;
 	mtx_lock(&root_holds_mtx);
@@ -181,8 +178,8 @@
 root_mount_rel(struct root_hold_token *h)
 {
 
-	if (h == NULL)
-		return;
+	KASSERT(h != NULL, ("%s: NULL token", __func__));
+
 	mtx_lock(&root_holds_mtx);
 	LIST_REMOVE(h, list);
 	wakeup(&root_holds);