[issue39238] test_asyncio: test_cancel_make_subprocess_transport_exec() hangs randomly on PPC64LE Fedora 3.x

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

AMD64 RHEL7 LTO + PGO 3.8:
https://buildbot.python.org/all/#/builders/83/builds/76

...
test_terminate (test.test_asyncio.test_subprocess.SubprocessFastWatcherTests) ... ok
Timeout (0:15:00)!
Thread 0x00007f070075a740 (most recent call first):
  File "/home/buildbot/buildarea/3.8.cstratak-RHEL7-x86_64.lto-pgo/build/Lib/selectors.py", line 468 in select
  File "/home/buildbot/buildarea/3.8.cstratak-RHEL7-x86_64.lto-pgo/build/Lib/asyncio/base_events.py", line 1823 in _run_once
  File "/home/buildbot/buildarea/3.8.cstratak-RHEL7-x86_64.lto-pgo/build/Lib/asyncio/base_events.py", line 570 in run_forever
  File "/home/buildbot/buildarea/3.8.cstratak-RHEL7-x86_64.lto-pgo/build/Lib/asyncio/base_events.py", line 603 in run_until_complete
  File "/home/buildbot/buildarea/3.8.cstratak-RHEL7-x86_64.lto-pgo/build/Lib/test/test_asyncio/test_subprocess.py", line 440 in test_cancel_make_subprocess_transport_exec
  File "/home/buildbot/buildarea/3.8.cstratak-RHEL7-x86_64.lto-pgo/build/Lib/unittest/case.py", line 633 in _callTestMethod

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