Revision 1.246 should have also included

- Weaken the assertion in vm_page_insert() to require Giant only if the
   vm_object isn't locked.

Reported by:	 "Ilmar S. Habibulin" <ilmar@watson.org>

sys/vm/vm_page.c

@@ -532,6 +532,8 @@ vm_page_insert(vm_page_t m, vm_object_t object, vm_pindex_t pindex)
 {
 	vm_page_t root;
 
+	if (!VM_OBJECT_LOCKED(object))
+		GIANT_REQUIRED;
 	if (m->object != NULL)
 		panic("vm_page_insert: already inserted");
 
@@ -541,7 +543,6 @@ vm_page_insert(vm_page_t m, vm_object_t object, vm_pindex_t pindex)
 	m->object = object;
 	m->pindex = pindex;
 
-	mtx_assert(object == kmem_object ? &object->mtx : &Giant, MA_OWNED);
 	/*
 	 * Now link into the object's ordered list of backed pages.
 	 */