Python 3.4-3.5 pipe leak in multiprocessing.Process

leak.py

import unittest

from multiprocessing import Process
import time
import os
import fcntl


def count_leaks(process_count):
    def p_start(i):
        print(i)

    procs = []
    for i in range(process_count):
        p = Process(target=p_start, args=(str(i),))
        p.start()
        procs.append(p)

    for p in procs:
        p.join()

    leaks = 0
    for p in procs:
        try:
            fcntl.fcntl(p.sentinel, fcntl.F_GETFD)
        except:
            pass
        else:
            os.close(p.sentinel)
            leaks += 1
    return leaks


class MpPipeLeakTest(unittest.TestCase):
    def test(self):
        self.assertEqual(count_leaks(10), 0)

if __name__ == '__main__':
    unittest.main()

tox summary

___________________________________ summary ____________________________________
  py26: commands succeeded
  py27: commands succeeded
ERROR:   py34: commands failed
ERROR:   py35: commands failed

tox.ini

[tox]
envlist = py26, py27, py34, py35
skipsdist=True

[testenv]
commands = python leak.py {posargs}