diff -r bf5a899a5d7c Lib/inspect.py
--- a/Lib/inspect.py	Sun Apr 12 17:56:34 2015 -0400
+++ b/Lib/inspect.py	Mon Apr 13 12:39:31 2015 -0400
@@ -596,7 +596,7 @@
             if hasattr(object, '__file__'):
                 return object.__file__
         raise TypeError('{!r} is a built-in class'.format(object))
-    if ismethod(object):
+    while ismethod(object):
         object = object.__func__
     if isfunction(object):
         object = object.__code__
@@ -772,7 +772,7 @@
         else:
             raise OSError('could not find class definition')
 
-    if ismethod(object):
+    while ismethod(object):
         object = object.__func__
     if isfunction(object):
         object = object.__code__
diff -r bf5a899a5d7c Lib/test/test_inspect.py
--- a/Lib/test/test_inspect.py	Sun Apr 12 17:56:34 2015 -0400
+++ b/Lib/test/test_inspect.py	Mon Apr 13 12:39:31 2015 -0400
@@ -354,6 +354,11 @@
     def test_getfile(self):
         self.assertEqual(inspect.getfile(mod.StupidGit), mod.__file__)
 
+    def test_getfile_nested_methodtype(self):
+        m1 = types.MethodType((lambda self: self), object())
+        m2 = types.MethodType(m1, object())
+        inspect.getsource(m2)
+            
     def test_getfile_class_without_module(self):
         class CM(type):
             @property
@@ -497,6 +502,11 @@
             self.assertRaises(IOError, inspect.findsource, co)
             self.assertRaises(IOError, inspect.getsource, co)
 
+    def test_findsource_nested_methodtype(self):
+        m1 = types.MethodType((lambda self: self), object())
+        m2 = types.MethodType(m1, object())
+        inspect.findsource(m2)
+
 class TestNoEOL(GetSourceBase):
     def __init__(self, *args, **kwargs):
         self.tempdir = TESTFN + '_dir'