Index: Objects/tupleobject.c
===================================================================
--- Objects/tupleobject.c	(revision 76743)
+++ Objects/tupleobject.c	(working copy)
@@ -875,7 +875,8 @@
 
 	/* XXX UNREF/NEWREF interface should be more symmetrical */
 	_Py_DEC_REFTOTAL;
-	_PyObject_GC_UNTRACK(v);
+	if (_PyObject_GC_IS_TRACKED(v))
+		_PyObject_GC_UNTRACK(v);
 	_Py_ForgetReference((PyObject *) v);
 	/* DECREF items deleted by shrinkage */
 	for (i = newsize; i < oldsize; i++) {
Index: Lib/test/test_tuple.py
===================================================================
--- Lib/test/test_tuple.py	(revision 76743)
+++ Lib/test/test_tuple.py	(working copy)
@@ -146,6 +146,9 @@
             pass
         self.check_track_dynamic(MyTuple, True)
 
+    def test_bug7466(self):
+        # Tuple may be untracked while not finished
+        self._not_tracked(tuple(gc.collect() for i in range(101)))
 
 def test_main():
     test_support.run_unittest(TupleTest)