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child_processes_test.test_fails_nonzero_with_bad_exec is flaky on CI #102

@chriskuehl

Description

@chriskuehl

This happened on CI during make test (not inside Docker):

21:49:33 py27 runtests: commands[0] | python -m pytest
21:49:33 ============================= test session starts ==============================
21:49:33 platform linux2 -- Python 2.7.6, pytest-2.9.2, py-1.4.31, pluggy-0.3.1
21:49:33 rootdir: /ephemeral/jenkins_prod_slave/workspace/mirrors-Yelp-dumb-init, inifile: pytest.ini
21:49:33 plugins: timeout-1.0.0
21:49:33 collected 173 items
21:49:33 
21:49:39 tests/child_processes_test.py ....................F...
21:49:39 tests/cli_test.py ......................................................................
21:49:39 tests/exit_status_test.py ................................................
21:49:40 tests/proxies_signals_test.py ..........................
21:49:41 tests/shell_background_test.py ....
21:49:41 tests/tty_test.py .
21:49:41 
21:49:41 =================================== FAILURES ===================================
21:49:41 _________________ test_fails_nonzero_with_bad_exec[0-0-args0] __________________
21:49:41 
21:49:41 args = ('/doesnotexist',)
21:49:41 
21:49:41     @pytest.mark.parametrize('args', [
21:49:41         ('/doesnotexist',),
21:49:41         ('--', '/doesnotexist'),
21:49:41         ('-c', '/doesnotexist'),
21:49:41         ('--single-child', '--', '/doesnotexist'),
21:49:41     ])
21:49:41     @pytest.mark.usefixtures('both_debug_modes', 'both_setsid_modes')
21:49:41     def test_fails_nonzero_with_bad_exec(args):
21:49:41         """If dumb-init can't exec as requested, it should exit nonzero."""
21:49:41         proc = Popen(('dumb-init',) + args, stderr=PIPE)
21:49:41 >       _, stderr = proc.communicate()
21:49:41 
21:49:41 tests/child_processes_test.py:141: 
21:49:41 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
21:49:41 /usr/lib/python2.7/subprocess.py:793: in communicate
21:49:41     stderr = _eintr_retry_call(self.stderr.read)
21:49:41 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
21:49:41 
21:49:41 func = <built-in method read of file object at 0x2a56f60>, args = ()
21:49:41 
21:49:41     def _eintr_retry_call(func, *args):
21:49:41         while True:
21:49:41             try:
21:49:41 >               return func(*args)
21:49:41 E               Failed: Timeout >5s
21:49:41 
21:49:41 /usr/lib/python2.7/subprocess.py:476: Failed
21:49:41 ===================== 1 failed, 172 passed in 7.75 seconds =====================

Not quite sure what could have caused this...

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