Here is a (new?) failure of test_asynchat with Python 3.1b1 on MacOS X 
10.4.11 (Intel).

% make test
....
test test_asynchat produced unexpected output:
**********************************************************************
*** lines 2-16 of actual output doesn't appear in expected output after 
line 1:
+ error: uncaptured python exception, closing channel 
<test.test_asynchat.echo_client at 0x21dcc30> (<class 'socket.error'
>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-3
.1b1/Lib/asyncore.py|handle_expt_event|440])
+ error: uncaptured python exception, closing channel 
<test.test_asynchat.echo_client at 0x21dcb90> (<class 'socket.error'
>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-3
.1b1/Lib/asyncore.py|handle_expt_event|440])
+ error: uncaptured python exception, closing channel 
<test.test_asynchat.echo_client at 0x21dcf90> (<class 'socket.error'
>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-3
.1b1/Lib/asyncore.py|handle_expt_event|440])
+ error: uncaptured python exception, closing channel 
<test.test_asynchat.echo_client at 0x21dcd50> (<class 'socket.error'
>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-3
.1b1/Lib/asyncore.py|handle_expt_event|440])
+ error: uncaptured python exception, closing channel 
<test.test_asynchat.echo_client at 0x21dcc30> (<class 'socket.error'
>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-3
.1b1/Lib/asyncore.py|handle_expt_event|440])
+ error: uncaptured python exception, closing channel 
<test.test_asynchat.echo_client at 0x21dcb90> (<class 'socket.error'
>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-3
.1b1/Lib/asyncore.py|handle_expt_event|440])
+ error: uncaptured python exception, closing channel 
<test.test_asynchat.echo_client at 0x21dcf90> (<class 'socket.error'
>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-3
.1b1/Lib/asyncore.py|handle_expt_event|440])
+ error: uncaptured python exception, closing channel 
<test.test_asynchat.echo_client at 0x21dcd50> (<class 'socket.error'
>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-3
.1b1/Lib/asyncore.py|handle_expt_event|440])
+ error: uncaptured python exception, closing channel 
<test.test_asynchat.echo_client at 0x21dcc30> (<class 'socket.error'
>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-3
.1b1/Lib/asyncore.py|handle_expt_event|440])
+ error: uncaptured python exception, closing channel 
<test.test_asynchat.echo_client at 0x21dcb90> (<class 'socket.error'
>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-3
.1b1/Lib/asyncore.py|handle_expt_event|440])
+ error: uncaptured python exception, closing channel 
<test.test_asynchat.echo_client at 0x21dc2d0> (<class 'socket.error'
>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-3
.1b1/Lib/asyncore.py|handle_expt_event|440])
+ error: uncaptured python exception, closing channel 
<test.test_asynchat.echo_client at 0x21dcc30> (<class 'socket.error'
>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-3
.1b1/Lib/asyncore.py|handle_expt_event|440])
+ error: uncaptured python exception, closing channel 
<test.test_asynchat.echo_client at 0x21dcbb0> (<class 'socket.error'
>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-3
.1b1/Lib/asyncore.py|handle_expt_event|440])
+ error: uncaptured python exception, closing channel 
<test.test_asynchat.echo_client at 0x21dcb90> (<class 'socket.error'
>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-3
.1b1/Lib/asyncore.py|handle_expt_event|440])
+ error: uncaptured python exception, closing channel 
<test.test_asynchat.echo_client at 0x21dcd50> (<class 'socket.error'
>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-3
.1b1/Lib/asyncore.py|handle_expt_event|440])
**********************************************************************
....

% ./python.exe Lib/test/test_asynchat.py
test_close_when_done (__main__.TestAsynchat) ... ok
test_empty_line (__main__.TestAsynchat) ... ok
test_line_terminator1 (__main__.TestAsynchat) ... ok
test_line_terminator2 (__main__.TestAsynchat) ... ok
test_line_terminator3 (__main__.TestAsynchat) ... ok
test_none_terminator (__main__.TestAsynchat) ... ok
test_numeric_terminator1 (__main__.TestAsynchat) ... ok
test_numeric_terminator2 (__main__.TestAsynchat) ... ok
test_simple_producer (__main__.TestAsynchat) ... ok
test_string_producer (__main__.TestAsynchat) ... ok
test_close_when_done (__main__.TestAsynchat_WithPoll) ... ok
test_empty_line (__main__.TestAsynchat_WithPoll) ... error: uncaptured 
python exception, closing channel <__main__.echo_client at 0x107cf30> 
(<class 'socket.error'>:[Errno 9] Bad file descriptor [../Python-
3.1b1/Lib/asyncore.py|readwrite|106] [../Python-
3.1b1/Lib/asyncore.py|handle_expt_event|440])
ok
test_line_terminator1 (__main__.TestAsynchat_WithPoll) ... error: 
uncaptured python exception, closing channel <__main__.echo_client at 
0x107c3f0> (<class 'socket.error'>:[Errno 9] Bad file descriptor 
[../Python-3.1b1/Lib/asyncore.py|readwrite|106] [../Python-
3.1b1/Lib/asyncore.py|handle_expt_event|440])
error: uncaptured python exception, closing channel 
<__main__.echo_client at 0x107ceb0> (<class 'socket.error'>:[Errno 9] 
Bad file descriptor [../Python-3.1b1/Lib/asyncore.py|readwrite|106] 
[../Python-3.1b1/Lib/asyncore.py|handle_expt_event|440])
error: uncaptured python exception, closing channel 
<__main__.echo_client at 0x107cf50> (<class 'socket.error'>:[Errno 9] 
Bad file descriptor [../Python-3.1b1/Lib/asyncore.py|readwrite|106] 
[../Python-3.1b1/Lib/asyncore.py|handle_expt_event|440])
ok
test_line_terminator2 (__main__.TestAsynchat_WithPoll) ... error: 
uncaptured python exception, closing channel <__main__.echo_client at 
0x107ce70> (<class 'socket.error'>:[Errno 9] Bad file descriptor 
[../Python-3.1b1/Lib/asyncore.py|readwrite|106] [../Python-
3.1b1/Lib/asyncore.py|handle_expt_event|440])
error: uncaptured python exception, closing channel 
<__main__.echo_client at 0x107ced0> (<class 'socket.error'>:[Errno 9] 
Bad file descriptor [../Python-3.1b1/Lib/asyncore.py|readwrite|106] 
[../Python-3.1b1/Lib/asyncore.py|handle_expt_event|440])
error: uncaptured python exception, closing channel 
<__main__.echo_client at 0x107cf30> (<class 'socket.error'>:[Errno 9] 
Bad file descriptor [../Python-3.1b1/Lib/asyncore.py|readwrite|106] 
[../Python-3.1b1/Lib/asyncore.py|handle_expt_event|440])
ok
test_line_terminator3 (__main__.TestAsynchat_WithPoll) ... error: 
uncaptured python exception, closing channel <__main__.echo_client at 
0x107ceb0> (<class 'socket.error'>:[Errno 9] Bad file descriptor 
[../Python-3.1b1/Lib/asyncore.py|readwrite|106] [../Python-
3.1b1/Lib/asyncore.py|handle_expt_event|440])
error: uncaptured python exception, closing channel 
<__main__.echo_client at 0x107cf50> (<class 'socket.error'>:[Errno 9] 
Bad file descriptor [../Python-3.1b1/Lib/asyncore.py|readwrite|106] 
[../Python-3.1b1/Lib/asyncore.py|handle_expt_event|440])
error: uncaptured python exception, closing channel 
<__main__.echo_client at 0x107cef0> (<class 'socket.error'>:[Errno 9] 
Bad file descriptor [../Python-3.1b1/Lib/asyncore.py|readwrite|106] 
[../Python-3.1b1/Lib/asyncore.py|handle_expt_event|440])
ok
test_none_terminator (__main__.TestAsynchat_WithPoll) ... error: 
uncaptured python exception, closing channel <__main__.echo_client at 
0x107cf50> (<class 'socket.error'>:[Errno 9] Bad file descriptor 
[../Python-3.1b1/Lib/asyncore.py|readwrite|106] [../Python-
3.1b1/Lib/asyncore.py|handle_expt_event|440])
ok
test_numeric_terminator1 (__main__.TestAsynchat_WithPoll) ... error: 
uncaptured python exception, closing channel <__main__.echo_client at 
0x107ce10> (<class 'socket.error'>:[Errno 9] Bad file descriptor 
[../Python-3.1b1/Lib/asyncore.py|readwrite|106] [../Python-
3.1b1/Lib/asyncore.py|handle_expt_event|440])
ok
test_numeric_terminator2 (__main__.TestAsynchat_WithPoll) ... error: 
uncaptured python exception, closing channel <__main__.echo_client at 
0x107ce50> (<class 'socket.error'>:[Errno 9] Bad file descriptor 
[../Python-3.1b1/Lib/asyncore.py|readwrite|106] [../Python-
3.1b1/Lib/asyncore.py|handle_expt_event|440])
ok
test_simple_producer (__main__.TestAsynchat_WithPoll) ... error: 
uncaptured python exception, closing channel <__main__.echo_client at 
0x107cdb0> (<class 'socket.error'>:[Errno 9] Bad file descriptor 
[../Python-3.1b1/Lib/asyncore.py|readwrite|106] [../Python-
3.1b1/Lib/asyncore.py|handle_expt_event|440])
ok
test_string_producer (__main__.TestAsynchat_WithPoll) ... error: 
uncaptured python exception, closing channel <__main__.echo_client at 
0x107cf50> (<class 'socket.error'>:[Errno 9] Bad file descriptor 
[../Python-3.1b1/Lib/asyncore.py|readwrite|106] [../Python-
3.1b1/Lib/asyncore.py|handle_expt_event|440])
ok
test_find_prefix_at_end (__main__.TestHelperFunctions) ... ok
test_basic (__main__.TestFifo) ... ok
test_given_list (__main__.TestFifo) ... ok

----------------------------------------------------------------------
Ran 23 tests in 7.712s

OK