tested:

Python 2.5.2 (r252:60911, Jun 24 2008, 16:40:26) 
[GCC 4.2.1 20070719  [FreeBSD]] on freebsd7

FreeBSD tomcat 7.0-RELEASE FreeBSD 7.0-RELEASE #0: Sun Feb 24 19:59:52
UTC 2008     root@logan.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386

expt -> o
read -> fo
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/local/lib/python2.5/threading.py", line 486, in
__bootstrap_inner
    self.run()
  File "/usr/local/lib/python2.5/threading.py", line 446, in run
    self.__target(*self.__args, **self.__kwargs)
  File "test.py", line 13, in server
    data = conn.recv(1024, socket.MSG_OOB)
error: (22, 'Invalid argument')

and:
Python 2.5 (r25:51908, Jun 25 2007, 16:00:15) 
[GCC 3.4.2 [FreeBSD] 20040728] on freebsd5

FreeBSD timcat 5.4-RELEASE FreeBSD 5.4-RELEASE #0: Sat Sep  9 03:32:05
MSD 2006     root@timcat:/usr/obj/usr/src/sys/SMP  i386

expt -> o
read -> fo
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/local/lib/python2.5/threading.py", line 460, in __bootstrap
    self.run()
  File "/usr/local/lib/python2.5/threading.py", line 440, in run
    self.__target(*self.__args, **self.__kwargs)
  File "test.py2", line 13, in server
    data = conn.recv(1024, socket.MSG_OOB)
error: (22, 'Invalid argument')

and:

Python 2.4.3 (#1, Jun 23 2006, 10:54:52) 
[GCC 2.95.4 20020320 [FreeBSD]] on freebsd4

FreeBSD comanchee-girl 4.9-RELEASE-CMN-1.1 FreeBSD 4.9-RELEASE-CMN-1.1
#4: Mon Apr 26 02:11:27 MSD 2004    
root@comanchee-girl:/usr/obj/usr/src/sys/CMN  i386

expt -> o
read -> fo
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/local/lib/python2.4/threading.py", line 442, in __bootstrap
    self.run()
  File "/usr/local/lib/python2.4/threading.py", line 422, in run
    self.__target(*self.__args, **self.__kwargs)
  File "test.py", line 13, in server
    data = conn.recv(1024, socket.MSG_OOB)
error: (22, 'Invalid argument')


All versions are stable and working in production. Except 7th version
the servers are loaded (la 0.2 to 3) with http/mysql/mail daemons.
Seems like a bug in python socket usage of freebsd for long time.