New submission from STINNER Victor <vstin...@redhat.com>:
The test fails once on AMD64 Windows8.1 Non-Debug 3.x when the Python test suite is run in parallel, but pass if the test is run alone (when the system is more "idle"). https://buildbot.python.org/all/#/builders/12/builds/1898 ====================================================================== FAIL: test_async_gen_asyncio_gc_aclose_09 (test.test_asyncgen.AsyncGenAsyncioTest) ---------------------------------------------------------------------- Traceback (most recent call last): File "D:\buildarea\3.x.ware-win81-release\build\lib\test\test_asyncgen.py", line 684, in test_async_gen_asyncio_gc_aclose_09 self.assertEqual(DONE, 1) AssertionError: 0 != 1 It can reproduce the failure on a very busy Windows using 2 terminals: * python -m test -F -W -j4 test_asyncgen test_asyncgen test_asyncgen test_asyncgen * python -m test -j0 -r -u all The first command runs the test 4 times in parallel in a loop until if fails, the second command is just one way to stress the system. The test is based on time and so has a race condition depending on the exact timing: def test_async_gen_asyncio_gc_aclose_09(self): DONE = 0 async def gen(): nonlocal DONE try: while True: yield 1 finally: await asyncio.sleep(0.01) await asyncio.sleep(0.01) DONE = 1 async def run(): g = gen() await g.__anext__() await g.__anext__() del g await asyncio.sleep(0.1) self.loop.run_until_complete(run()) self.assertEqual(DONE, 1) ---------- components: Library (Lib), Tests messages: 333868 nosy: vstinner priority: normal severity: normal status: open title: test_asyncio: test_async_gen_asyncio_gc_aclose_09() race condition versions: Python 3.7, Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue35760> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
