Attached crash.py script does crash Python.

Python traceback on the crash:

(gdb) py-bt
Traceback (most recent call first):
  File "/home/haypo/prog/python/default/Lib/tokenize.py", line 431, in open
    text = TextIOWrapper(buffer, encoding, line_buffering=True)
  File "/home/haypo/prog/python/default/Lib/linecache.py", line 126, in updatecache
    with tokenize.open(fullname) as fp:
  File "/home/haypo/prog/python/default/Lib/linecache.py", line 41, in getlines
    return updatecache(filename, module_globals)
  File "/home/haypo/prog/python/default/Lib/linecache.py", line 15, in getline
    lines = getlines(filename, module_globals)
  File "/home/haypo/prog/python/default/Lib/traceback.py", line 65, in _extract_tb_or_stack_iter
    line = linecache.getline(filename, lineno, f.f_globals)
  File "/home/haypo/prog/python/default/Lib/traceback.py", line 18, in _format_list_iter
    for filename, lineno, name, line in extracted_list:
  File "/home/haypo/prog/python/default/Lib/traceback.py", line 153, in _format_exception_iter
    yield from _format_list_iter(_extract_tb_iter(tb, limit=limit))
  File "/home/haypo/prog/python/default/Lib/traceback.py", line 181, in format_exception
    return list(_format_exception_iter(etype, value, tb, limit, chain))
  File "/home/haypo/prog/python/default/Lib/asyncio/futures.py", line 178, in __del__
    exc.__traceback__)
  Garbage-collecting

End of the C traceback:

#46 0x00000000005aa742 in PyEval_CallObjectWithKeywords (func=<method at remote 0x7ffff19e79f8>, arg=(), kw=0x0) at Python/ceval.c:4107
#47 0x00000000004ee268 in slot_tp_finalize (
    self=<Future(_state='FINISHED', _exception=ValueError(), _loop=<_UnixSelectorEventLoop(_selector=<EpollSelector(_epoll=<select.epoll at remote 0x7ffff0dd3a18>, _fd_to_key={9: <SelectorKey at remote 0x7fffeefaa0e0>}, _map=<_SelectorMapping(_selector=<...>) at remote 0x7ffff18eae90>) at remote 0x7ffff18ea1f8>, _running=False, _signal_handlers={}, _default_executor=None, _ssock=<socket at remote 0x7fffef7e6e68>, _internal_fds=1, _scheduled=[], _ready=<collecti---Type <return> to continue, or q <return> to quit---
ons.deque at remote 0x7ffff18c56e0>, _csock=<socket at remote 0x7fffeefb5958>) at remote 0x7ffff18ea190>, _log_traceback=True, _callbacks=[]) at remote 0x7ffff18ea0c0>) at Objects/typeobject.c:5954
#48 0x000000000043b530 in finalize_garbage (collectable=0x7fffffffdc90, old=0x8eea20 <generations+64>) at Modules/gcmodule.c:793
#49 0x000000000043bce5 in collect (generation=2, n_collected=0x0, n_uncollectable=0x0, nofail=1) at Modules/gcmodule.c:1009
#50 0x000000000043cff4 in _PyGC_CollectNoFail () at Modules/gcmodule.c:1625
#51 0x00000000005cd873 in PyImport_Cleanup () at Python/import.c:383
#52 0x000000000041e898 in Py_Finalize () at Python/pythonrun.c:622
#53 0x000000000043a65c in Py_Main (argc=2, argv=0x970020) at Modules/main.c:800
#54 0x000000000041aad9 in main (argc=2, argv=0x7fffffffe0b8) at ./Modules/python.c:69