Xiang Zhang added the comment:

Related commit is bdb1cf1ca56db25b33fb15dd91eef2cc32cd8973. A simple reproduce 
snippet:

import multiprocessing as mp

def foo(q):
    q.put('hello')
    assert not q.empty()

if __name__ == '__main__':
    mp.set_start_method('spawn')
    q = mp.SimpleQueue()
    p = mp.Process(target=foo, args=(q,))
    p.start()
    print(q.get())
    p.join()

----------
nosy: +xiang.zhang
stage:  -> patch review
type: crash -> behavior
versions: +Python 3.5, Python 3.7

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<http://bugs.python.org/issue30301>
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