Thanks, can confirm it on Python 3.7 . Unfortunately I couldn't test it with master since I have some problems setting up virtualenv and pip with the compiled binary. Running it on Python 3.7 hangs

(bpo34173-env) ➜  cpython git:(master) ✗ python
Python 3.7.0 (default, Jun 28 2018, 02:32:19)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

(bpo34173-env) ➜  cpython git:(master) ✗ python bpo34173-recreate.py
^CException in worker
Traceback (most recent call last):
  File "/usr/lib/python3.7/concurrent/futures/thread.py", line 78, in _worker
    work_item = work_queue.get(block=True)
KeyboardInterrupt
^CException in worker
Traceback (most recent call last):
  File "/usr/lib/python3.7/concurrent/futures/thread.py", line 78, in _worker
    work_item = work_queue.get(block=True)
KeyboardInterrupt
^CException in worker
Traceback (most recent call last):
  File "/usr/lib/python3.7/concurrent/futures/thread.py", line 78, in _worker
    work_item = work_queue.get(block=True)
KeyboardInterrupt
^CException in worker
Traceback (most recent call last):
  File "/usr/lib/python3.7/concurrent/futures/thread.py", line 78, in _worker
    work_item = work_queue.get(block=True)
KeyboardInterrupt
^CException in worker
Traceback (most recent call last):
  File "/usr/lib/python3.7/concurrent/futures/thread.py", line 78, in _worker
    work_item = work_queue.get(block=True)
KeyboardInterrupt
Finished Tasks ['UnnamedTask', 'UnnamedTask', 'UnnamedTask', 'UnnamedTask', 'UnnamedTask']s in 14.368564367294312fs



Thanks