Index: head/sys/kern/vfs_default.c
===================================================================
--- head/sys/kern/vfs_default.c
+++ head/sys/kern/vfs_default.c
@@ -1100,10 +1100,10 @@
 		if (vp->v_object != NULL) {
 			start = trunc_page(ap->a_start);
 			end = round_page(ap->a_end);
-			VM_OBJECT_WLOCK(vp->v_object);
+			VM_OBJECT_RLOCK(vp->v_object);
 			vm_object_page_noreuse(vp->v_object, OFF_TO_IDX(start),
 			    OFF_TO_IDX(end));
-			VM_OBJECT_WUNLOCK(vp->v_object);
+			VM_OBJECT_RUNLOCK(vp->v_object);
 		}
 
 		bo = &vp->v_bufobj;
Index: head/sys/vm/vm_object.c
===================================================================
--- head/sys/vm/vm_object.c
+++ head/sys/vm/vm_object.c
@@ -1978,7 +1978,7 @@
 	struct mtx *mtx, *new_mtx;
 	vm_page_t p, next;
 
-	VM_OBJECT_ASSERT_WLOCKED(object);
+	VM_OBJECT_ASSERT_LOCKED(object);
 	KASSERT((object->flags & (OBJ_FICTITIOUS | OBJ_UNMANAGED)) == 0,
 	    ("vm_object_page_noreuse: illegal object %p", object));
 	if (object->resident_page_count == 0)