Intermittent test failures in twisted.conch.test.test_cftp

New submission from ivank <[email protected]>:

After running twisted.conch.test.test_cftp a few hundred times (with an script running trial twisted.conch.test.test_cftp), I see one of these on Ubuntu 9.04 server 64 bit (with its default Python 2.6.2 install): 

{{{
===============================================================================
[ERROR]: twisted.conch.test.test_cftp.TestOurServerCmdLineClient.testGet

Traceback (most recent call last):
Failure: twisted.internet.defer.TimeoutError: <twisted.conch.test.test_cftp.TestOurServerCmdLineClient testMethod=testGet> 
(testGet) still running at 120.0 secs
-------------------------------------------------------------------------------
Ran 24 tests in 129.291s

FAILED (errors=1, successes=23)
}}}

OR

{{{

===============================================================================
[ERROR]: twisted.conch.test.test_cftp.TestOurServerCmdLineClient.testPut

Traceback (most recent call last):
Failure: twisted.internet.defer.TimeoutError: <twisted.conch.test.test_cftp.TestOurServerCmdLineClient testMethod=testPut> 
(testPut) still running at 120.0 secs
-------------------------------------------------------------------------------
Ran 24 tests in 127.929s

FAILED (errors=1, successes=23)
}}}


This happens with the select, epoll, and libevent reactors.

Twisted version: trunk, svn r26968

----------
Type     : defect
Component: conch
Keywords : 
Priority : normal
Nosy     : 
----------
http://twistedmatrix.com/trac/ticket/3873