(1) test.test_asyncio.test_tasks.CTaskSubclass_PyFuture_Tests.test_wait_with_exception() hangs:

vstinner@apu$ PYTHONASYNCIODEBUG=1 ./python -m test test_asyncio -m test_wait_with_exception -v
== CPython 3.7.0a4+ (heads/freebsd_configure:27218edef7, Jan 23 2018, 11:52:08) [GCC 7.2.1 20170915 (Red Hat 7.2.1-2)]
== Linux-4.14.13-300.fc27.x86_64-x86_64-with-fedora-27-Twenty_Seven little-endian
== cwd: /home/vstinner/prog/python/master/build/test_python_24675
== CPU count: 8
== encodings: locale=UTF-8, FS=utf-8
Run tests sequentially
0:00:00 load avg: 1.37 [1/1] test_asyncio
test_wait_with_exception (test.test_asyncio.test_tasks.CTaskSubclass_PyFuture_Tests) ... /home/vstinner/prog/python/master/Lib/test/test_asyncio/test_tasks.py:1009: RuntimeWarning: coroutine 'sleep' was never awaited
Coroutine created at (most recent call last)
  File "/home/vstinner/prog/python/master/Lib/unittest/case.py", line 615, in run
    testMethod()
  File "/home/vstinner/prog/python/master/Lib/test/test_asyncio/test_tasks.py", line 1021, in test_wait_with_exception
    loop.run_until_complete(self.new_task(loop, foo()))
  File "/home/vstinner/prog/python/master/Lib/asyncio/base_events.py", line 423, in run_until_complete
    self.run_forever()
  File "/home/vstinner/prog/python/master/Lib/asyncio/base_events.py", line 391, in run_forever
    self._run_once()
  File "/home/vstinner/prog/python/master/Lib/test/test_asyncio/utils.py", line 454, in _run_once
    super()._run_once()
  File "/home/vstinner/prog/python/master/Lib/asyncio/base_events.py", line 1521, in _run_once
    handle._run()
  File "/home/vstinner/prog/python/master/Lib/asyncio/events.py", line 88, in _run
    self._context.run(self._callback, *self._args)
  File "/home/vstinner/prog/python/master/Lib/test/test_asyncio/test_tasks.py", line 2289, in _step
    return super()._step(*args)
  File "/home/vstinner/prog/python/master/Lib/asyncio/coroutines.py", line 61, in send
    return self.gen.send(value)
  File "/home/vstinner/prog/python/master/Lib/test/test_asyncio/test_tasks.py", line 1009, in sleeper
    yield from asyncio.sleep(0.15, loop=loop)
  yield from asyncio.sleep(0.15, loop=loop)


(2) 43 failures and 55 errors:

ERROR: test_context_manager (test.test_asyncio.test_locks.ConditionTests)
ERROR: test_context_manager (test.test_asyncio.test_locks.LockTests)
ERROR: test_context_manager_cant_reuse (test.test_asyncio.test_locks.LockTests)
ERROR: test_lock (test.test_asyncio.test_locks.LockTests)
ERROR: test_lock_by_with_statement (test.test_asyncio.test_locks.LockTests)
ERROR: test_repr (test.test_asyncio.test_locks.LockTests)
ERROR: test_context_manager (test.test_asyncio.test_locks.SemaphoreTests)
ERROR: test_semaphore (test.test_asyncio.test_locks.SemaphoreTests)
ERROR: test_as_completed (test.test_asyncio.test_tasks.CTaskSubclass_PyFuture_Tests)
ERROR: test_as_completed_duplicate_coroutines (test.test_asyncio.test_tasks.CTaskSubclass_PyFuture_Tests)
ERROR: test_sleep (test.test_asyncio.test_tasks.CTaskSubclass_PyFuture_Tests)
ERROR: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.CTaskSubclass_PyFuture_Tests)
ERROR: test_tb_logger_not_called_after_cancel (test.test_asyncio.test_tasks.CTaskSubclass_PyFuture_Tests)
ERROR: test_as_completed (test.test_asyncio.test_tasks.CTask_CFuture_SubclassTests)
ERROR: test_as_completed_duplicate_coroutines (test.test_asyncio.test_tasks.CTask_CFuture_SubclassTests)
ERROR: test_sleep (test.test_asyncio.test_tasks.CTask_CFuture_SubclassTests)
ERROR: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.CTask_CFuture_SubclassTests)
ERROR: test_tb_logger_not_called_after_cancel (test.test_asyncio.test_tasks.CTask_CFuture_SubclassTests)
ERROR: test_as_completed (test.test_asyncio.test_tasks.CTask_CFuture_Tests)
ERROR: test_as_completed_duplicate_coroutines (test.test_asyncio.test_tasks.CTask_CFuture_Tests)
ERROR: test_sleep (test.test_asyncio.test_tasks.CTask_CFuture_Tests)
ERROR: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.CTask_CFuture_Tests)
ERROR: test_tb_logger_not_called_after_cancel (test.test_asyncio.test_tasks.CTask_CFuture_Tests)
ERROR: test_foobar (test.test_asyncio.test_tasks.CTask_Future_Tests)
ERROR: test_as_completed (test.test_asyncio.test_tasks.CTask_PyFuture_Tests)
ERROR: test_as_completed_duplicate_coroutines (test.test_asyncio.test_tasks.CTask_PyFuture_Tests)
ERROR: test_sleep (test.test_asyncio.test_tasks.CTask_PyFuture_Tests)
ERROR: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.CTask_PyFuture_Tests)
ERROR: test_tb_logger_not_called_after_cancel (test.test_asyncio.test_tasks.CTask_PyFuture_Tests)
ERROR: test_await_old_style_coro (test.test_asyncio.test_tasks.CompatibilityTests)
ERROR: test_yield_from_awaitable (test.test_asyncio.test_tasks.CompatibilityTests)
ERROR: test_as_completed (test.test_asyncio.test_tasks.PyTask_CFutureSubclass_Tests)
ERROR: test_as_completed_duplicate_coroutines (test.test_asyncio.test_tasks.PyTask_CFutureSubclass_Tests)
ERROR: test_sleep (test.test_asyncio.test_tasks.PyTask_CFutureSubclass_Tests)
ERROR: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.PyTask_CFutureSubclass_Tests)
ERROR: test_tb_logger_not_called_after_cancel (test.test_asyncio.test_tasks.PyTask_CFutureSubclass_Tests)
ERROR: test_as_completed (test.test_asyncio.test_tasks.PyTask_CFuture_Tests)
ERROR: test_as_completed_duplicate_coroutines (test.test_asyncio.test_tasks.PyTask_CFuture_Tests)
ERROR: test_sleep (test.test_asyncio.test_tasks.PyTask_CFuture_Tests)
ERROR: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.PyTask_CFuture_Tests)
ERROR: test_tb_logger_not_called_after_cancel (test.test_asyncio.test_tasks.PyTask_CFuture_Tests)
ERROR: test_as_completed (test.test_asyncio.test_tasks.PyTask_PyFuture_SubclassTests)
ERROR: test_as_completed_duplicate_coroutines (test.test_asyncio.test_tasks.PyTask_PyFuture_SubclassTests)
ERROR: test_sleep (test.test_asyncio.test_tasks.PyTask_PyFuture_SubclassTests)
ERROR: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.PyTask_PyFuture_SubclassTests)
ERROR: test_tb_logger_not_called_after_cancel (test.test_asyncio.test_tasks.PyTask_PyFuture_SubclassTests)
ERROR: test_as_completed (test.test_asyncio.test_tasks.PyTask_PyFuture_Tests)
ERROR: test_as_completed_duplicate_coroutines (test.test_asyncio.test_tasks.PyTask_PyFuture_Tests)
ERROR: test_sleep (test.test_asyncio.test_tasks.PyTask_PyFuture_Tests)
ERROR: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.PyTask_PyFuture_Tests)
ERROR: test_tb_logger_not_called_after_cancel (test.test_asyncio.test_tasks.PyTask_PyFuture_Tests)
ERROR: test_run_coroutine_threadsafe (test.test_asyncio.test_tasks.RunCoroutineThreadsafeTests)
ERROR: test_run_coroutine_threadsafe_task_cancelled (test.test_asyncio.test_tasks.RunCoroutineThreadsafeTests)
ERROR: test_run_coroutine_threadsafe_with_exception (test.test_asyncio.test_tasks.RunCoroutineThreadsafeTests)
ERROR: test_sleep_zero (test.test_asyncio.test_tasks.SleepTests)
FAIL: test_default_exc_handler_coro (test.test_asyncio.test_base_events.BaseEventLoopTests)
FAIL: test_nonstream_socket (test.test_asyncio.test_base_events.BaseLoopSendfileTests)
FAIL: test_as_completed (test.test_asyncio.test_tasks.CTaskSubclass_PyFuture_Tests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.CTaskSubclass_PyFuture_Tests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.CTaskSubclass_PyFuture_Tests)
FAIL: test_sleep (test.test_asyncio.test_tasks.CTaskSubclass_PyFuture_Tests)
FAIL: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.CTaskSubclass_PyFuture_Tests)
FAIL: test_as_completed (test.test_asyncio.test_tasks.CTask_CFuture_SubclassTests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.CTask_CFuture_SubclassTests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.CTask_CFuture_SubclassTests)
FAIL: test_sleep (test.test_asyncio.test_tasks.CTask_CFuture_SubclassTests)
FAIL: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.CTask_CFuture_SubclassTests)
FAIL: test_as_completed (test.test_asyncio.test_tasks.CTask_CFuture_Tests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.CTask_CFuture_Tests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.CTask_CFuture_Tests)
FAIL: test_sleep (test.test_asyncio.test_tasks.CTask_CFuture_Tests)
FAIL: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.CTask_CFuture_Tests)
FAIL: test_as_completed (test.test_asyncio.test_tasks.CTask_PyFuture_Tests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.CTask_PyFuture_Tests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.CTask_PyFuture_Tests)
FAIL: test_sleep (test.test_asyncio.test_tasks.CTask_PyFuture_Tests)
FAIL: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.CTask_PyFuture_Tests)
FAIL: test_as_completed (test.test_asyncio.test_tasks.PyTask_CFutureSubclass_Tests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.PyTask_CFutureSubclass_Tests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.PyTask_CFutureSubclass_Tests)
FAIL: test_sleep (test.test_asyncio.test_tasks.PyTask_CFutureSubclass_Tests)
FAIL: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.PyTask_CFutureSubclass_Tests)
FAIL: test_as_completed (test.test_asyncio.test_tasks.PyTask_CFuture_Tests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.PyTask_CFuture_Tests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.PyTask_CFuture_Tests)
FAIL: test_sleep (test.test_asyncio.test_tasks.PyTask_CFuture_Tests)
FAIL: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.PyTask_CFuture_Tests)
FAIL: test_as_completed (test.test_asyncio.test_tasks.PyTask_PyFuture_SubclassTests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.PyTask_PyFuture_SubclassTests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.PyTask_PyFuture_SubclassTests)
FAIL: test_sleep (test.test_asyncio.test_tasks.PyTask_PyFuture_SubclassTests)
FAIL: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.PyTask_PyFuture_SubclassTests)
FAIL: test_as_completed (test.test_asyncio.test_tasks.PyTask_PyFuture_Tests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.PyTask_PyFuture_Tests)
FAIL: test_baseexception_during_cancel (test.test_asyncio.test_tasks.PyTask_PyFuture_Tests)
FAIL: test_sleep (test.test_asyncio.test_tasks.PyTask_PyFuture_Tests)
FAIL: test_task_cancel_sleeping_task (test.test_asyncio.test_tasks.PyTask_PyFuture_Tests)
FAIL: test_run_coroutine_threadsafe_task_factory_exception (test.test_asyncio.test_tasks.RunCoroutineThreadsafeTests)
FAILED (failures=43, errors=55, skipped=5)

These errors can be reproduced using attached fails file:

PYTHONASYNCIODEBUG=1 ./python -m test -v test_asyncio --matchfile=fails


Note: I found these issue when trying to run the full Python test suite using -X dev.