[Python-Dev] Pervasive socket failures on Windows (original) (raw)

Tim Peters tim.peters at gmail.com
Fri Feb 10 04:17:02 CET 2006

Noticed that various socket tests are failing today, WinXP, Python trunk:

test_socket_ssl Exception in thread Thread-27: Traceback (most recent call last): File "C:\Code\python\lib\threading.py", line 444, in __bootstrap self.run() File "C:\Code\python\lib\threading.py", line 424, in run self.__target(*self.__args, **self.__kwargs) File "C:\Code\python\lib\test\test_socket_ssl.py", line 50, in listener s.accept() File "C:\Code\python\lib\socket.py", line 169, in accept sock, addr = self._sock.accept() error: unable to select on socket

test test_socket_ssl crashed -- socket.error: (10061, 'Connection refused')

test test_urllibnet failed -- errors occurred; run in verbose mode for details Running that in verbose mode shows 2 "ok" and 8 "ERROR". A typical ERROR:

ERROR: test_basic (test.test_urllibnet.urlopenNetworkTests)

Traceback (most recent call last): File "C:\Code\python\lib\test\test_urllibnet.py", line 43, in test_basic open_url = urllib.urlopen("http://www.python.org/") File "C:\Code\python\lib\urllib.py", line 82, in urlopen return opener.open(url) File "C:\Code\python\lib\urllib.py", line 190, in open return getattr(self, name)(url) File "C:\Code\python\lib\urllib.py", line 325, in open_http h.endheaders() File "C:\Code\python\lib\httplib.py", line 798, in endheaders self._send_output() File "C:\Code\python\lib\httplib.py", line 679, in _send_output self.send(msg) File "C:\Code\python\lib\httplib.py", line 658, in send self.sock.sendall(str) File "", line 1, in sendall IOError: [Errno socket error] unable to select on socket

test_logging appears to consume 100% of a CPU now, and never finishes. This may be an independent error.

test_asynchat Exception in thread Thread-1: Traceback (most recent call last): File "C:\Code\python\lib\threading.py", line 444, in __bootstrap self.run() File "C:\Code\python\lib\test\test_asynchat.py", line 18, in run conn, client = sock.accept() File "C:\Code\python\lib\socket.py", line 169, in accept sock, addr = self._sock.accept() error: unable to select on socket

test_socket is a long-winded disaster.

test_socketserver test test_socketserver crashed -- socket.error: (10061, 'Connection refused')

There are others, but tests that use sockets hang a lot now & it's tedious to worm around that.

I suspect that rev 42253 introduced these problems. For example, that added:

to _ssl.c, and added

+/* Can we call select() with this socket without a buffer overrun? */ +#define IS_SELECTABLE(s) ((s)->sock_fd < FD_SETSIZE)

to socketmodule.c, but those appear to make no sense. FD_SETSIZE is the maximum number of distinct fd's an fdset can hold, and the numerical magnitude of any specific fd has nothing to do with that in general (they may be related in fact on Unix systems that implement an fdset as "a big bit vector" -- but Windows doesn't work that way, and neither do all Unix systems, and nothing in socket specs requires an implementation to work that way).

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