(...)
0:39:52 load avg: 0.06 running: test_concurrent_futures (19 min 2 sec)
0:40:22 load avg: 0.05 running: test_concurrent_futures (19 min 32 sec)
0:40:51 load avg: 0.03 [447/447/2] test_concurrent_futures crashed (Exit code 1)
Timeout (0:20:00)!
Thread 0x000007e8 (most recent call first):
  File "D:\a\cpython\cpython\Lib\multiprocessing\connection.py", line 282 in _send_bytes
  File "D:\a\cpython\cpython\Lib\multiprocessing\connection.py", line 199 in send_bytes
  File "D:\a\cpython\cpython\Lib\multiprocessing\queues.py", line 246 in _feed
  (...)
  File "D:\a\cpython\cpython\Lib\threading.py", line 1009 in _bootstrap

Thread 0x00001738 (most recent call first):
  File "D:\a\cpython\cpython\Lib\threading.py", line 1146 in _wait_for_tstate_lock
  File "D:\a\cpython\cpython\Lib\threading.py", line 1126 in join
  (...)
  File "D:\a\cpython\cpython\Lib\threading.py", line 1009 in _bootstrap

Thread 0x0000103c (most recent call first):
  File "D:\a\cpython\cpython\Lib\threading.py", line 1146 in _wait_for_tstate_lock
  File "D:\a\cpython\cpython\Lib\threading.py", line 1126 in join
  File "D:\a\cpython\cpython\Lib\concurrent\futures\process.py", line 836 in shutdown
  File "D:\a\cpython\cpython\Lib\concurrent\futures\_base.py", line 647 in __exit__
  File "D:\a\cpython\cpython\Lib\test\test_concurrent_futures.py", line 1386 in test_crash_big_data
  (...)
  File "D:\a\cpython\cpython\Lib\test\support\__init__.py", line 1241 in run_unittest
  File "D:\a\cpython\cpython\Lib\test\libregrtest\runtest.py", line 294 in _test_module
  (...)