Index: sys/vm/vm_page.c
===================================================================
--- sys/vm/vm_page.c
+++ sys/vm/vm_page.c
@@ -3862,9 +3862,8 @@
 {
 	u_int old;
 
-	KASSERT(m->object != NULL,
-	    ("vm_page_wire: page %p does not belong to an object", m));
-	if (!vm_page_busied(m) && !vm_object_busied(m->object))
+	if (m->object != NULL && !vm_page_busied(m) &&
+	    !vm_object_busied(m->object))
 		VM_OBJECT_ASSERT_LOCKED(m->object);
 	KASSERT((m->flags & PG_FICTITIOUS) == 0 ||
 	    VPRC_WIRE_COUNT(m->ref_count) >= 1,