$ ./python -Werror -m test.regrtest -v -m test_sys_exit test_multiprocessing_spawn
== CPython 3.5.0a0 (default:149cc6364180+, Jun 12 2014, 15:45:54) [GCC 4.6.3]
==   Linux-3.8.0-36-generic-i686-with-debian-wheezy-sid little-endian
==   hash algorithm: siphash24 32bit
==   /home/serhiy/py/cpython/build/test_python_9425
Testing with flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0, dont_write_bytecode=0, no_user_site=0, no_site=0, ignore_environment=0, verbose=0, bytes_warning=0, quiet=0, hash_randomization=1, isolated=0)
[1/1] test_multiprocessing_spawn
test_sys_exit (test.test_multiprocessing_spawn.WithProcessesTestSubclassingProcess) ... Exception ignored in: <_io.FileIO name='@test_9425_tmp' mode='wb'>
ResourceWarning: unclosed file <_io.TextIOWrapper name='@test_9425_tmp' mode='w' encoding='UTF-8'>
FAIL

======================================================================
FAIL: test_sys_exit (test.test_multiprocessing_spawn.WithProcessesTestSubclassingProcess)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/serhiy/py/cpython/Lib/test/_test_multiprocessing.py", line 483, in test_sys_exit
    self.assertEqual(f.read().rstrip(), str(reason))
AssertionError: "[1, 2, 3]\nException ignored in: <_io.Fi[123 chars]-8'>" != '[1, 2, 3]'
- [1, 2, 3]
?          -
+ [1, 2, 3]- Exception ignored in: <_io.FileIO name='/dev/null' mode='rb'>
- ResourceWarning: unclosed file <_io.TextIOWrapper name='/dev/null' mode='r' encoding='UTF-8'>

----------------------------------------------------------------------
Ran 1 test in 1.247s

FAILED (failures=1)
test test_multiprocessing_spawn failed
1 test failed:
    test_multiprocessing_spawn