diff -r fd8dc3746992 Lib/asyncore.py
--- a/Lib/asyncore.py	Sat Jul 02 14:43:11 2011 +0200
+++ b/Lib/asyncore.py	Tue Jul 05 20:49:17 2011 +0200
@@ -132,7 +132,8 @@
             is_w = obj.writable()
             if is_r:
                 r.append(fd)
-            if is_w:
+            # accepting sockets should not be writable
+            if is_w and not obj.accepting:
                 w.append(fd)
             if is_r or is_w:
                 e.append(fd)
@@ -179,7 +180,8 @@
             flags = 0
             if obj.readable():
                 flags |= select.POLLIN | select.POLLPRI
-            if obj.writable():
+            # accepting sockets should not be writable
+            if obj.writable() and not obj.accepting:
                 flags |= select.POLLOUT
             if flags:
                 # Only check for exceptions if object was either readable