Index: head/sys/fs/nullfs/null_subr.c
===================================================================
--- head/sys/fs/nullfs/null_subr.c
+++ head/sys/fs/nullfs/null_subr.c
@@ -222,9 +222,6 @@
 	 * provide ready to use vnode.
 	 */
 	if (VOP_ISLOCKED(lowervp) != LK_EXCLUSIVE) {
-		KASSERT((MOUNTTONULLMOUNT(mp)->nullm_flags & NULLM_CACHE) != 0,
-		    ("lowervp %p is not excl locked and cache is disabled",
-		    lowervp));
 		vn_lock(lowervp, LK_UPGRADE | LK_RETRY);
 		if ((lowervp->v_iflag & VI_DOOMED) != 0) {
 			vput(lowervp);
Index: head/sys/fs/nullfs/null_vnops.c
===================================================================
--- head/sys/fs/nullfs/null_vnops.c
+++ head/sys/fs/nullfs/null_vnops.c
@@ -893,11 +893,7 @@
 		return (ENOENT);
 	}
 
-	/*
-	 * Exclusive lock is required by insmntque1 call in
-	 * null_nodeget()
-	 */
-	error = vn_lock(ldvp, LK_EXCLUSIVE);
+	error = vn_lock(ldvp, LK_SHARED);
 	if (error != 0) {
 		vrele(ldvp);
 		vn_lock(vp, locked | LK_RETRY);