try to initalize all builtin types with PyType_Ready to avoid problems like #5787

Lib/test/test_descr.py

+import __builtin__
 import types
 import unittest
 import warnings
@@ -3895,6 +3896,17 @@ order (MRO) for bases """
         else:
             self.fail("new-style class must have a new-style base")
 
+    def test_builtin_bases(self):
+        # Make sure all the builtin types can have their base queried without
+        # segfaulting. See issue #5787.
+        builtin_types = [tp for tp in __builtin__.__dict__.itervalues()
+                         if isinstance(tp, type)]
+        for tp in builtin_types:
+            object.__getattribute__(tp, "__bases__")
+            if tp is not object:
+                self.assertEqual(len(tp.__bases__), 1, tp)
+
+
     def test_mutable_bases_with_failing_mro(self):
         # Testing mutable bases with failing mro...
         class WorkOnce(type):

Misc/NEWS

@@ -12,6 +12,9 @@ What's New in Python 2.7 alpha 1
 Core and Builtins
 -----------------
 
+- Issue #5787: object.__getattribute__(some_type, "__bases__") segfaulted on
+  some builtin types.
+
 - Issue #1869: fix a couple of minor round() issues.  round(5e15+1)
     was giving 5e15+2; round(-0.0) was losing the sign of the zero.
 

Objects/frameobject.c

@@ -606,14 +606,6 @@ int _PyFrame_Init()
 	builtin_object = PyString_InternFromString("__builtins__");
 	if (builtin_object == NULL)
 		return 0;
-	/* 
-	   Traceback objects are not created the normal way (through calling the
-	   type), so PyType_Ready has to be called here.
-	*/
-	if (PyType_Ready(&PyTraceBack_Type)) {
-		Py_DECREF(builtin_object);
-		return 0;
-	}
 	return 1;
 }
 

Objects/object.c

@@ -2033,28 +2033,88 @@ void
 _Py_ReadyTypes(void)
 {
 	if (PyType_Ready(&PyType_Type) < 0)
-		Py_FatalError("Can't initialize 'type'");
+		Py_FatalError("Can't initialize type type");
 
 	if (PyType_Ready(&_PyWeakref_RefType) < 0)
-		Py_FatalError("Can't initialize 'weakref'");
+		Py_FatalError("Can't initialize weakref type");
 
 	if (PyType_Ready(&PyBool_Type) < 0)
-		Py_FatalError("Can't initialize 'bool'");
+		Py_FatalError("Can't initialize bool type");
 
 	if (PyType_Ready(&PyString_Type) < 0)
-		Py_FatalError("Can't initialize 'str'");
+		Py_FatalError("Can't initialize str type");
 
 	if (PyType_Ready(&PyByteArray_Type) < 0)
-		Py_FatalError("Can't initialize 'bytes'");
+		Py_FatalError("Can't initialize bytearray");
 
 	if (PyType_Ready(&PyList_Type) < 0)
-		Py_FatalError("Can't initialize 'list'");
+		Py_FatalError("Can't initialize list");
 
 	if (PyType_Ready(&PyNone_Type) < 0)
-		Py_FatalError("Can't initialize type(None)");
+		Py_FatalError("Can't initialize None type");
 
 	if (PyType_Ready(&PyNotImplemented_Type) < 0)
-		Py_FatalError("Can't initialize type(NotImplemented)");
+		Py_FatalError("Can't initialize NotImplemented type");
+
+	if (PyType_Ready(&PyTraceBack_Type) < 0)
+		Py_FatalError("Can't initialize traceback type");
+
+	if (PyType_Ready(&PySuper_Type) < 0)
+		Py_FatalError("Can't initialize super type");
+
+	if (PyType_Ready(&PyBaseObject_Type) < 0)
+		Py_FatalError("Can't initialize object type");
+
+	if (PyType_Ready(&PyRange_Type) < 0)
+		Py_FatalError("Can't initialize xrange type");
+
+	if (PyType_Ready(&PyDict_Type) < 0)
+		Py_FatalError("Can't initialize dict type");
+
+	if (PyType_Ready(&PySet_Type) < 0)
+		Py_FatalError("Can't initialize set type");
+
+	if (PyType_Ready(&PyUnicode_Type) < 0)
+		Py_FatalError("Can't initialize unicode type");
+
+	if (PyType_Ready(&PySlice_Type) < 0)
+		Py_FatalError("Can't initialize slice type");
+
+	if (PyType_Ready(&PyStaticMethod_Type) < 0)
+		Py_FatalError("Can't initialize static method type");
+
+	if (PyType_Ready(&PyComplex_Type) < 0)
+		Py_FatalError("Can't initalize complex type");
+
+	if (PyType_Ready(&PyFloat_Type) < 0)
+		Py_FatalError("Can't initalize float type");
+
+	if (PyType_Ready(&PyBuffer_Type) < 0)
+		Py_FatalError("Can't initialize buffer type");
+
+	if (PyType_Ready(&PyLong_Type) < 0)
+		Py_FatalError("Can't initialize long type");
+
+	if (PyType_Ready(&PyInt_Type) < 0)
+		Py_FatalError("Can't initialize int type");
+
+	if (PyType_Ready(&PyFrozenSet_Type) < 0)
+		Py_FatalError("Can't initialize frozenset type");
+
+	if (PyType_Ready(&PyProperty_Type) < 0)
+		Py_FatalError("Can't initialize property type");
+
+	if (PyType_Ready(&PyMemoryView_Type) < 0)
+		Py_FatalError("Can't initialize memoryview type");
+
+	if (PyType_Ready(&PyTuple_Type) < 0)
+		Py_FatalError("Can't initalize tuple type");
+
+	if (PyType_Ready(&PyEnum_Type) < 0)
+		Py_FatalError("Can't initalize enumerate type");
+
+	if (PyType_Ready(&PyReversed_Type) < 0)
+		Py_FatalError("Can't initalize reversed type");
 }