test_asyncio.test_subprocess.test_terminate() timed out on AMD64 RHEL8 LTO + PGO 3.x, and then test_asyncio.test_subprocess.test_kill() timed out on the same worker.

AMD64 RHEL8 LTO + PGO 3.x:
https://buildbot.python.org/all/#/builders/284/builds/232

0:14:52 load avg: 0.00 running: test_asyncio (14 min 30 sec)
0:15:22 load avg: 0.00 running: test_asyncio (15 min)
0:15:22 load avg: 0.00 [419/419/2] test_asyncio crashed (Exit code 1)
Timeout (0:15:00)!
Thread 0x00007f3e8b8d9740 (most recent call first):
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-x86_64.lto-pgo/build/Lib/selectors.py", line 468 in select
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-x86_64.lto-pgo/build/Lib/asyncio/base_events.py", line 1837 in _run_once
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-x86_64.lto-pgo/build/Lib/asyncio/base_events.py", line 589 in run_forever
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-x86_64.lto-pgo/build/Lib/asyncio/base_events.py", line 621 in run_until_complete
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-x86_64.lto-pgo/build/Lib/test/test_asyncio/test_subprocess.py", line 188 in test_terminate
...
0:15:22 load avg: 0.00 Re-running test_asyncio in verbose mode
...
test_devnull_error (test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests) ... ok
test_devnull_input (test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests) ... ok
test_devnull_output (test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests) ... ok
test_empty_input (test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests) ... ok
test_exec_loop_deprecated (test.test_asyncio.test_subprocess.SubprocessMultiLoopWatcherTests) ... ok
Timeout (0:15:00)!
Thread 0x00007fc16479e740 (most recent call first):
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-x86_64.lto-pgo/build/Lib/selectors.py", line 468 in select
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-x86_64.lto-pgo/build/Lib/asyncio/base_events.py", line 1837 in _run_once
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-x86_64.lto-pgo/build/Lib/asyncio/base_events.py", line 589 in run_forever
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-x86_64.lto-pgo/build/Lib/asyncio/base_events.py", line 621 in run_until_complete
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-x86_64.lto-pgo/build/Lib/test/test_asyncio/test_subprocess.py", line 175 in test_kill
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL8-x86_64.lto-pgo/build/Lib/unittest/case.py", line 616 in _callTestMethod