test_asyncio fails once on AMD64 RHEL7 Refleaks 3.x, and then test_close_kill_running() was killed after 3h 15 min. I guess that it hangs, but I'm not 100% sure. When test_asyncio was re-run, it seems like test_asyncio was run 3x successful but it hanged at the 4rd run. Refleaks runs each test 6 times.

https://buildbot.python.org/all/#/builders/264/builds/10

0:17:04 load avg: 3.01 [416/419/1] test_asyncio failed (12 min 21 sec) -- running: test_multiprocessing_fork (6 min 34 sec), test_concurrent_futures (10 min 52 sec), test_multiprocessing_spawn (13 min 53 sec)
beginning 6 repetitions
123456
.Unknown child process pid 25032, will report returncode 255
Loop <_UnixSelectorEventLoop running=False closed=True debug=False> that handles pid 25032 is closed
.Unknown child process pid 19349, will report returncode 255
Child watcher got an unexpected pid: 19349
Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-x86_64.refleak/build/Lib/asyncio/unix_events.py", line 1213, in _do_waitpid
    loop, callback, args = self._callbacks.pop(pid)
KeyError: 19349
test test_asyncio failed -- Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-x86_64.refleak/build/Lib/test/test_asyncio/test_subprocess.py", line 156, in test_shell
    self.assertEqual(exitcode, 7)
AssertionError: 255 != 7

(...)
0:21:59 load avg: 0.52 [419/419/1] test_concurrent_futures passed (15 min 46 sec)
(...)
== Tests result: FAILURE ==

404 tests OK.

10 slowest tests:
- test_concurrent_futures: 15 min 46 sec
- test_multiprocessing_spawn: 14 min 7 sec
- test_asyncio: 12 min 21 sec
- test_multiprocessing_forkserver: 8 min 59 sec
- test_multiprocessing_fork: 7 min 13 sec
- test_io: 3 min 47 sec
- test_subprocess: 3 min 30 sec
- test_pickle: 2 min 51 sec
- test_capi: 2 min 47 sec
- test_zipfile: 2 min 41 sec

1 test failed:
    test_asyncio

14 tests skipped:
    test_devpoll test_gdb test_ioctl test_kqueue test_msilib
    test_ossaudiodev test_startfile test_tix test_tk test_ttk_guionly
    test_winconsoleio test_winreg test_winsound test_zipfile64

Re-running failed tests in verbose mode

Re-running test_asyncio in verbose mode
beginning 6 repetitions
123456
(...)

test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
...
test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests) ... ok
...
test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessSafeWatcherTests) ... ok
...
test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessThreadedWatcherTests) ... ok
...


test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
...
test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests) ... ok
...
test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessSafeWatcherTests) ... ok
...
test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessThreadedWatcherTests) ... ok
...


test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
...
test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests) ... ok
...
test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessSafeWatcherTests) ... ok
...
test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessThreadedWatcherTests) ... ok
...


test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
...
test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests) ... ok
...
test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessSafeWatcherTests) ... ok
...
test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessThreadedWatcherTests) ... ok
...
test_close_kill_running (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_communicate (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_communicate_ignore_broken_pipe (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_create_subprocess_exec_text_mode_fails (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_create_subprocess_exec_with_path (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_create_subprocess_shell_text_mode_fails (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_devnull_error (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_devnull_input (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_devnull_output (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_empty_input (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_exec_loop_deprecated (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_kill (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_pause_reading (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_popen_error (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_popen_error_with_stdin_pipe (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_process_create_warning (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_read_stdout_after_process_exit (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_send_signal (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_shell (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_shell_loop_deprecated (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_start_new_session (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_stdin_broken_pipe (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_stdin_not_inheritable (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_stdin_stdout (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_subprocess_protocol_create_warning (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_terminate (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
test_cancel_make_subprocess_transport_exec (test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests) ... ok
test_cancel_post_init (test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests) ... ok
test_cancel_process_wait (test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests) ... ok
test_close_dont_kill_finished (test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests) ... ok
...Timeout (3:15:00)!
Thread 0x00007f666a7a1740 (most recent call first):
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-x86_64.refleak/build/Lib/selectors.py", line 468 in select
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-x86_64.refleak/build/Lib/asyncio/base_events.py", line 1837 in _run_once
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-x86_64.refleak/build/Lib/asyncio/base_events.py", line 589 in run_forever
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-x86_64.refleak/build/Lib/asyncio/base_events.py", line 621 in run_until_complete
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-x86_64.refleak/build/Lib/test/test_asyncio/test_subprocess.py", line 484 in test_close_kill_running