diff --exclude=.svn --exclude=.hg -I '$Id:.*$' -r -u Python-3.2.orig/Lib/asyncore.py Python-3.2/Lib/asyncore.py
--- Python-3.2.orig/Lib/asyncore.py    2011-02-11 15:01:46.000000000 +0100
+++ Python-3.2/Lib/asyncore.py 2011-10-05 12:50:23.000000000 +0200
@@ -406,6 +406,11 @@
     # cheap inheritance, used to pass all other attribute
     # references to the underlying socket object.
     def __getattr__(self, attr):
+        # Avoid infinite recursion. The 'socket' attribute may be missing
+        # when doing a copy of, or when unpickling, a dispatcher instance.
+        if attr == 'socket':
+            raise AttributeError("%s instance has no attribute 'socket'"
+                                 % self.__class__.__name__)
         try:
             retattr = getattr(self.socket, attr)
         except AttributeError:
diff --exclude=.svn --exclude=.hg -I '$Id:.*$' -r -u Python-3.2.orig/Lib/test/test_asyncore.py Python-3.2/Lib/test/test_asyncore.py
--- Python-3.2.orig/Lib/test/test_asyncore.py  2010-12-01 03:32:32.000000000 +0100
+++ Python-3.2/Lib/test/test_asyncore.py       2011-10-05 12:54:05.000000000 +0200
@@ -7,6 +7,7 @@
 import time
 import warnings
 import errno
+import copy
 
 from test import support
 from test.support import TESTFN, run_unittest, unlink
@@ -331,6 +332,18 @@
         err = asyncore._strerror(-1)
         self.assertIn("unknown error", err.lower())
 
+    def test_issue_13103 (self):
+        # Check that a 'copy' of a dispatcher instance, does not cause
+        # infinite recursion.
+        try:
+            d = copy.copy(asyncore.dispatcher())
+        except RuntimeError:
+            # Trap RuntimeError to avoid cluttering the screen with
+            # error messages.
+            self.assertTrue(False)
+        else:
+            self.assertEqual(repr(d), '<asyncore.dispatcher at %#x>' % id(d))
+
 
 class dispatcherwithsend_noread(asyncore.dispatcher_with_send):
     def readable(self):