test_with_ephemeral_hidden_services_basic_auth [FAILURE]

get this with 0.2.9.x series :

Running tests...

  control.controller.test_with_ephemeral_hidden_services_basic_auth... failed (0.02s)
test_with_ephemeral_hidden_services_basic_auth               [FAILURE]

======================================================================
FAIL: test_with_ephemeral_hidden_services_basic_auth
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/tfoerste/devel/stem/test/runner.py", line 127, in wrapped
    return func(self, *args, **kwargs)
  File "/home/tfoerste/devel/stem/test/runner.py", line 144, in wrapped
    return func(self, *args, **kwargs)
  File "/home/tfoerste/devel/stem/test/integ/control/controller.py", line 688, in test_with_ephemeral_hidden_services_basic_auth
    self.assertEqual(['bob'], response.client_auth.keys())  # newly created credentials were only created for bob
AssertionError: ['bob'] != dict_keys(['bob'])

----------------------------------------------------------------------
Ran 1 test in 0.019s

FAILED (failures=1)

at a hardened 64bit stable Gentoo desktop. The hardened feature shouldn't play a big role here, neither in pax.log nor in grsec.log are any suspicious entries.

A 1st attempt to bisect gives tor-0.2.9.0-root-769-g70fd23f - and I checked twice that that the previous commit is good and that commit is bad - but I don't have any clue how that commit id should harm the test case.