Antoine Pitrou added the comment:
I think I've found the answer: the thread is sometimes already stopped by the
time the child is forked, so it doesn't appear in _enumerate() anymore (it left
the _active dict). Therefore its locks are not reset in _after_fork().
Oh, I also get the following sporadic failure which is triggered by slight
change in semantics with Thread.join(timeout) :-)
======================================================================
FAIL: test_various_ops (test.test_threading.ThreadTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/antoine/cpython/default/Lib/test/test_threading.py", line 113, in
test_various_ops
self.assertTrue(not t.is_alive())
AssertionError: False is not true
----------
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<http://bugs.python.org/issue18808>
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