AttributeError: '_UnixSelectorEventLoop' object has no attribute '_ssock'

[Ali-Razmjoo]

➜ Nettacker git:(issue/609) ✗ python3 nettacker.py -i google.com --profile http -t 1100 -M 5

AttributeError: '_UnixSelectorEventLoop' object has no attribute '_ssock'
    self._remove_reader(self._ssock.fileno())
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/asyncio/selector_events.py", line 92, in close
    self._remove_reader(self._ssock.fileno())
AttributeError: '_UnixSelectorEventLoop' object has no attribute '_ssock'
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/asyncio/selector_events.py", line 99, in _close_self_pipe
    self._remove_reader(self._ssock.fileno())
AttributeError: '_UnixSelectorEventLoop' object has no attribute '_ssock'
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/asyncio/selector_events.py", line 99, in _close_self_pipe
    self._remove_reader(self._ssock.fileno())
    self._remove_reader(self._ssock.fileno())
AttributeError: '_UnixSelectorEventLoop' object has no attribute '_ssock'
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/asyncio/selector_events.py", line 99, in _close_self_pipe
    self._close_self_pipe()
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/asyncio/selector_events.py", line 99, in _close_self_pipe
AttributeError: '_UnixSelectorEventLoop' object has no attribute '_ssock'
AttributeError: '_UnixSelectorEventLoop' object has no attribute '_ssock'
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/asyncio/selector_events.py", line 99, in _close_self_pipe
    self._remove_reader(self._ssock.fileno())
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/asyncio/selector_events.py", line 99, in _close_self_pipe

[pUrGe12]

Okay I haven't completely boiled this down to the root cause, but the issue probably comes due to the number of parallel threads being used. When I ran the same code using only 100 threads it worked. I tracked it down to the wait_for_threads_to_finish so basically if you add even a small delay there through time.sleep(0.02) right after the function definition, you can run this command with 1100 threads.

Adding the line

import asyncio
asyncio.set_event_loop_policy(None)

to app.py in the beginning didn't work.

I am trying to find the reason for this