Index: sys/vm/vm_meter.c
===================================================================
--- sys/vm/vm_meter.c
+++ sys/vm/vm_meter.c
@@ -111,14 +111,7 @@
 	 */
 	mtx_lock(&vm_object_list_mtx);
 	TAILQ_FOREACH(object, &vm_object_list, object_list) {
-		if (!VM_OBJECT_TRYWLOCK(object)) {
-			/*
-			 * Avoid a lock-order reversal.  Consequently,
-			 * the reported number of active pages may be
-			 * greater than the actual number.
-			 */
-			continue;
-		}
+		VM_OBJECT_WLOCK(object);
 		vm_object_clear_flag(object, OBJ_ACTIVE);
 		VM_OBJECT_WUNLOCK(object);
 	}
@@ -196,10 +189,9 @@
 	mtx_lock(&vm_object_list_mtx);
 	TAILQ_FOREACH(object, &vm_object_list, object_list) {
 		/*
-		 * Perform unsynchronized reads on the object to avoid
-		 * a lock-order reversal.  In this case, the lack of
-		 * synchronization should not impair the accuracy of
-		 * the reported statistics. 
+		 * Perform unsynchronized reads on the object.  In
+		 * this case, the lack of synchronization should not
+		 * impair the accuracy of the reported statistics.
 		 */
 		if ((object->flags & OBJ_FICTITIOUS) != 0) {
 			/*
Index: sys/vm/vm_object.c
===================================================================
--- sys/vm/vm_object.c
+++ sys/vm/vm_object.c
@@ -157,7 +157,6 @@
 
 static int vm_object_zinit(void *mem, int size, int flags);
 
-#ifdef INVARIANTS
 static void vm_object_zdtor(void *mem, int size, void *arg);
 
 static void
@@ -166,6 +165,8 @@
 	vm_object_t object;
 
 	object = (vm_object_t)mem;
+	KASSERT(object->ref_count == 0,
+	    ("object %p ref_count = %d", object, object->ref_count));
 	KASSERT(TAILQ_EMPTY(&object->memq),
 	    ("object %p has resident pages in its memq", object));
 	KASSERT(vm_radix_is_empty(&object->rtree),
@@ -187,8 +188,8 @@
 	KASSERT(object->shadow_count == 0,
 	    ("object %p shadow_count = %d",
 	    object, object->shadow_count));
+	object->type = OBJT_DEAD;
 }
-#endif
 
 static int
 vm_object_zinit(void *mem, int size, int flags)
@@ -199,6 +200,8 @@
 	rw_init_flags(&object->lock, "vm object", RW_DUPOK | RW_NEW);
 
 	/* These are true for any object that has been freed */
+	object->type = OBJT_DEAD;
+	object->ref_count = 0;
 	object->rtree.rt_root = 0;
 	object->rtree.rt_flags = 0;
 	object->paging_in_progress = 0;
@@ -206,6 +209,10 @@
 	object->shadow_count = 0;
 	object->cache.rt_root = 0;
 	object->cache.rt_flags = 0;
+
+	mtx_lock(&vm_object_list_mtx);
+	TAILQ_INSERT_TAIL(&vm_object_list, object, object_list);
+	mtx_unlock(&vm_object_list_mtx);
 	return (0);
 }
 
@@ -252,10 +259,6 @@
 #if VM_NRESERVLEVEL > 0
 	LIST_INIT(&object->rvq);
 #endif
-
-	mtx_lock(&vm_object_list_mtx);
-	TAILQ_INSERT_TAIL(&vm_object_list, object, object_list);
-	mtx_unlock(&vm_object_list_mtx);
 }
 
 /*
@@ -671,13 +674,6 @@
 {
 
 	/*
-	 * Remove the object from the global object list.
-	 */
-	mtx_lock(&vm_object_list_mtx);
-	TAILQ_REMOVE(&vm_object_list, object, object_list);
-	mtx_unlock(&vm_object_list_mtx);
-
-	/*
 	 * Release the allocation charge.
 	 */
 	if (object->cred != NULL) {
@@ -1803,6 +1799,7 @@
 			KASSERT(backing_object->ref_count == 1, (
 "backing_object %p was somehow re-referenced during collapse!",
 			    backing_object));
+			backing_object->ref_count = 0;
 			VM_OBJECT_WUNLOCK(backing_object);
 			vm_object_destroy(backing_object);