sjagoe@simon-x1:~$ python3 executor-hang.py
Thread 0x00007ff88a052700 (most recent call first):
  File "/nix/store/ksr9f7i5gh6klr1lrlimhljvifjfn02r-python3-3.6.1/lib/python3.6/threading.py", line 240 in __enter__
  File "/nix/store/ksr9f7i5gh6klr1lrlimhljvifjfn02r-python3-3.6.1/lib/python3.6/queue.py", line 126 in put
  File "/nix/store/ksr9f7i5gh6klr1lrlimhljvifjfn02r-python3-3.6.1/lib/python3.6/concurrent/futures/thread.py", line 123 in weakref_cb
  File "executor-hang.py", line 26 in hacked_Queue_get
  File "/nix/store/ksr9f7i5gh6klr1lrlimhljvifjfn02r-python3-3.6.1/lib/python3.6/concurrent/futures/thread.py", line 64 in _worker
  File "/nix/store/ksr9f7i5gh6klr1lrlimhljvifjfn02r-python3-3.6.1/lib/python3.6/threading.py", line 864 in run
  File "/nix/store/ksr9f7i5gh6klr1lrlimhljvifjfn02r-python3-3.6.1/lib/python3.6/threading.py", line 916 in _bootstrap_inner
  File "/nix/store/ksr9f7i5gh6klr1lrlimhljvifjfn02r-python3-3.6.1/lib/python3.6/threading.py", line 884 in _bootstrap

Current thread 0x00007ff895ae2580 (most recent call first):
  File "/nix/store/ksr9f7i5gh6klr1lrlimhljvifjfn02r-python3-3.6.1/lib/python3.6/threading.py", line 1072 in _wait_for_tstate_lock
  File "/nix/store/ksr9f7i5gh6klr1lrlimhljvifjfn02r-python3-3.6.1/lib/python3.6/threading.py", line 1056 in join
  File "/nix/store/ksr9f7i5gh6klr1lrlimhljvifjfn02r-python3-3.6.1/lib/python3.6/concurrent/futures/thread.py", line 39 in _python_exit