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`tox -e parallel` sometimes fails in sync's test_processing_order

In "this branch":!8 (merged):

0 20160801 20:34:34 drebs@ppto:~/dev/leap/soledad/testing (feature/various-couch-fixes) $ tox -e parallel
GLOB sdist-make: /home/drebs/dev/leap/repos/soledad/testing/setup.py
parallel create: /home/drebs/dev/leap/repos/soledad/testing/.tox/parallel
parallel installdeps: pytest, pytest-twisted, mock, testscenarios, setuptools-trial, pep8, pdbp
parallel inst: /home/drebs/dev/leap/repos/soledad/testing/.tox/dist/test_soledad-0.0.0.zip
parallel installed: apipkg==1.4,Beaker==1.6.3,cffi==1.7.0,configparser==3.5.0,CouchDB==1.0.1,
cryptography==1.4,decorator==4.0.10,enum34==1.1.6,execnet==1.4.1,extras==1.0.0,
fancycompleter==0.5,fixtures==3.0.0,funcsigs==1.0.2,functools32==3.2.3.post2,
greenlet==0.4.10,idna==2.1,ipaddress==1.0.16,jsonschema==2.5.1,leap.common==0.5.2,
-e git+ssh://code.leap.se/soledad.git@25dae02dfa00d95215dea597a128b2163b88c24d#egg=leap.soledad.client
&subdirectory=client,-e git+ssh://code.leap.se/soledad.git@25dae02dfa00d95215dea597a128b2163b88c24d#egg=leap.soledad.common
&subdirectory=common,-e git+ssh://code.leap.se/soledad.git@25dae02dfa00d95215dea597a128b2163b88c24d#egg=leap.soledad.server
&subdirectory=server,linecache2==1.0.0,mock==2.0.0,ordereddict==1.1,Paste==2.0.3,
pathlib2==2.1.0,pbr==1.10.0,pdbpp==0.8.3,pep8==1.7.0,py==1.4.31,pyasn1==0.1.9,
pycparser==2.14,Pygments==2.1.3,pyOpenSSL==16.0.0,pyrepl==0.8.4,pysqlcipher==2.6.5,
pytest==2.9.2,pytest-twisted==1.5,pytest-xdist==1.14,python-dateutil==2.5.3,
python-mimeparse==1.5.2,pyzmq==15.3.0,repoze.lru==0.6,requests==2.10.0,Routes==2.3.1,
scrypt==0.7.1,setuptools-trial==0.6.0,six==1.10.0,test-soledad==0.0.0,testscenarios==0.5.0,testtools==2.2.0,traceback2==1.4.0,
Twisted==16.3.0,txZMQ==0.7.4,unittest2==1.1.0,wmctrl==0.3,zope.interface==4.2.0,
zope.proxy==4.2.0
parallel runtests: PYTHONHASHSEED='2731363281'
parallel runtests: commands[0] | py.test -n 4
===================================== test session starts =====================================
platform linux2 -- Python 2.7.9, pytest-2.9.2, py-1.4.31, pluggy-0.3.1
rootdir: /home/drebs/dev/leap/repos/soledad/testing/tests, inifile: pytest.ini
plugins: twisted-1.5, xdist-1.14
gw0 [629] / gw1 [629] / gw2 [629] / gw3 [629]
scheduling tests via LoadScheduling
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========================================== FAILURES ===========================================
_________________________ TestSyncDecrypterPool.test_processing_order _________________________
[gw3] linux2 -- Python 2.7.9 /home/drebs/dev/leap/repos/soledad/testing/.tox/parallel/bin/python2
result = None, g = 
deferred = 

    def _inlineCallbacks(result, g, deferred):
        """
        See L{inlineCallbacks}.
        """
        # This function is complicated by the need to prevent unbounded recursion
        # arising from repeatedly yielding immediately ready deferreds.  This while
        # loop and the waiting variable solve that by manually unfolding the
        # recursion.
    
        waiting = [True, # waiting for result?
                   None] # result
    
        while 1:
            try:
                # Send the last result back as the result of the yield expression.
                isFailure = isinstance(result, failure.Failure)
                if isFailure:
                    result = result.throwExceptionIntoGenerator(g)
                else:
>                   result = g.send(result)

../.tox/parallel/local/lib/python2.7/site-packages/twisted/internet/defer.py:1128: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
sync/test_encdecpool.py:251: in test_processing_order
    self.assertEqual(3, self._pool._processed_docs)
../.tox/parallel/local/lib/python2.7/site-packages/twisted/trial/_synctest.py:425: in assertEqual
    super(_Assertions, self).assertEqual(first, second, msg)
E   FailTest: 3 != 5
===================== 1 failed, 609 passed, 19 skipped in 102.78 seconds ======================
ERROR: InvocationError: '/home/drebs/dev/leap/repos/soledad/testing/.tox/parallel/bin/py.test -n 4'
___________________________________________ summary ____________________________________________
ERROR:   parallel: commands failed

(from redmine: created on 2016-08-02, closed on 2016-08-19)