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Ok, some news about this bug (I tested the ftp test account): the 
problem is that the data socket is not closed when self.voidresp() is 
called. I can't see close() syscall before the call to 
self.voidresp(). SocketIO.close() does nothing: it does not really 
close the socket, just the file. And socket.close() does also nothing 
because there is still an io reference... the closed file :-/ The io 
reference counter is only updated when the file is destroyed.
 conn = <create a socket>
 # conn._io_refs=0
 fp = conn.makefile('r', encoding=self.encoding)
 # conn._io_refs=1
 ...
 fp.close() # only set fp.closed to True
 conn.close() # only set conn._closed to True
 # conn._io_refs=1 and the socket (file descriptor) is still open
 del fp
 # conn._io_refs=0 -> the socket is finally closed!