New submission from Antoine Pitrou:

It looks like this may be the symptom of a buglet in Thread.join:

======================================================================
ERROR: test_communicate_timeout (test.test_subprocess.ProcessTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File 
"E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\test\test_subprocess.py",
 line 672, in test_communicate_timeout
    timeout=0.3)
  File 
"E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\unittest\case.py",
 line 689, in assertRaises
    return context.handle('assertRaises', callableObj, args, kwargs)
  File 
"E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\unittest\case.py",
 line 158, in handle
    callable_obj(*args, **kwargs)
  File 
"E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\subprocess.py",
 line 947, in communicate
    stdout, stderr = self._communicate(input, endtime, timeout)
  File 
"E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\subprocess.py",
 line 1193, in _communicate
    self.stdout_thread.join(self._remaining_time(endtime))
  File 
"E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\threading.py",
 line 1062, in join
    self._wait_for_tstate_lock(timeout=timeout)
  File 
"E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\threading.py",
 line 1074, in _wait_for_tstate_lock
    elif lock.acquire(block, timeout):
ValueError: timeout value must be strictly positive

----------
components: Library (Lib)
messages: 201296
nosy: pitrou, tim.peters
priority: normal
severity: normal
status: open
title: sporadic test_subprocess failure
versions: Python 3.4

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19399>
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