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Issue #28779: multiprocessing.set_forkserver_preload() would crash the forkserver process if a preloaded module instantiated some multiprocessing objects such as locks.

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This commit is contained in:
Antoine Pitrou 2016-12-10 17:16:17 +01:00
commit ebb39bcc04
5 changed files with 37 additions and 2 deletions
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13
Lib/test/_test_multiprocessing.py
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@ -3818,6 +3818,19 @@ class TestStartMethod(unittest.TestCase):
self.assertTrue(methods == ['fork', 'spawn'] or
methods == ['fork', 'spawn', 'forkserver'])
def test_preload_resources(self):
if multiprocessing.get_start_method() != 'forkserver':
self.skipTest("test only relevant for 'forkserver' method")
name = os.path.join(os.path.dirname(__file__), 'mp_preload.py')
rc, out, err = test.support.script_helper.assert_python_ok(name)
out = out.decode()
err = err.decode()
if out.rstrip() != 'ok' or err != '':
print(out)
print(err)
self.fail("failed spawning forkserver or grandchild")
#
# Check that killing process does not leak named semaphores
#