@skrah: Please replace # with GH- in the commit message next time. Thanks!

Thanks @skrah for the PR 🌮🎉.. I'm working now to backport this PR to: 3.8.
🐍🍒⛏🤖

Thanks @skrah for the PR 🌮🎉.. I'm working now to backport this PR to: 3.7.
🐍🍒⛏🤖

Sorry, @skrah, I could not cleanly backport this to 3.8 due to a conflict.
Please backport using cherry_picker on command line.
cherry_picker 815280eb160af637e1347213659f9236adf78f80 3.8

Sorry @skrah, I had trouble checking out the 3.7 backport branch.
Please backport using cherry_picker on command line.
cherry_picker 815280eb160af637e1347213659f9236adf78f80 3.7

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 FreeBSD Shared 3.x has failed when building commit 815280e.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/152/builds/345) and take a look at the build logs.
4. Check if the failure is related to this commit (815280e) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/152/builds/345

Failed tests:

• test_concurrent_futures

Failed subtests:

• test_killed_child - test.test_concurrent_futures.ProcessPoolForkProcessPoolExecutorTest

Summary of the results of the build (if available):

== Tests result: FAILURE then ENV CHANGED ==

399 tests OK.

10 slowest tests:

• test_multiprocessing_spawn: 8 min 22 sec
• test_tokenize: 8 min 17 sec
• test_unparse: 7 min 43 sec
• test_lib2to3: 5 min 37 sec
• test_concurrent_futures: 5 min 6 sec
• test_unicodedata: 5 min 2 sec
• test_multiprocessing_forkserver: 3 min 56 sec
• test_pickle: 3 min 48 sec
• test_subprocess: 3 min 34 sec
• test_asyncio: 3 min 17 sec

1 test altered the execution environment:
test_multiprocessing_spawn

20 tests skipped:
test_dbm_gnu test_devpoll test_epoll test_gdb test_idle test_ioctl
test_msilib test_ossaudiodev test_spwd test_startfile test_tcl
test_tix test_tk test_ttk_guionly test_ttk_textonly test_turtle
test_winconsoleio test_winreg test_winsound test_zipfile64

1 re-run test:
test_concurrent_futures

Total duration: 32 min 35 sec

Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/test/test_concurrent_futures.py", line 130, in tearDown
    self.executor.shutdown(wait=True)
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/concurrent/futures/process.py", line 699, in shutdown
    self._queue_management_thread_wakeup.wakeup()
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/concurrent/futures/process.py", line 94, in wakeup
    self._writer.send_bytes(b"")
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/multiprocessing/connection.py", line 200, in send_bytes
    self._send_bytes(m[offset:offset + size])
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/multiprocessing/connection.py", line 411, in _send_bytes
    self._send(header + buf)
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/multiprocessing/connection.py", line 368, in _send
    n = write(self._handle, buf)
OSError: [Errno 9] Bad file descriptor

GH-18713 is a backport of this pull request to the 3.8 branch.

GH-18714 is a backport of this pull request to the 3.7 branch.