Infinite loop when using ipdb on ipython 7.13+

I use pytest with appium and when I use ipdb.set_trace() I’m stuck in a loop:

Exception in thread Thread-21249:
Traceback (most recent call last):
  File "/usr/local/Cellar/python/3.7.6_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line 926, in _bootstrap_inner
    self.run()
  File "/usr/local/Cellar/python/3.7.6_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/Users/vverdeil/workspace/venv/testenv/lib/python3.7/site-packages/IPython/terminal/debugger.py", line 102, in in_thread
    line = self.pt_app.prompt()
  File "/Users/vverdeil/workspace/venv/testenv/lib/python3.7/site-packages/prompt_toolkit/shortcuts/prompt.py", line 986, in prompt
    return self.app.run()
  File "/Users/vverdeil/workspace/venv/testenv/lib/python3.7/site-packages/prompt_toolkit/application/application.py", line 788, in run
    return get_event_loop().run_until_complete(self.run_async(pre_run=pre_run))
  File "/usr/local/Cellar/python/3.7.6_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/asyncio/events.py", line 644, in get_event_loop
    % threading.current_thread().name)
RuntimeError: There is no current event loop in thread 'Thread-21249'.

As you can see I reached thread 21249 before managing to kill the process.

With the same code it works as expected on ipython 7.12, so I guess is it linked to https://github.com/ipython/ipython/pull/12141/

Am I the only one having this bug?

[delijati]

Yeah i still into the same issue. Welcome back to pre ipdb times 😭

ipdb> request
Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/lib/python3.8/threading.py", line 932, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.8/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/home/ubuntu/html/env/lib/python3.8/site-packages/IPython/terminal/debugger.py", line 122, in in_thread
    line = self.pt_app.prompt()
  File "/home/ubuntu/html/env/lib/python3.8/site-packages/prompt_toolkit/shortcuts/prompt.py", line 1013, in prompt
    return self.app.run(set_exception_handler=set_exception_handler)
  File "/home/ubuntu/html/env/lib/python3.8/site-packages/prompt_toolkit/application/application.py", line 816, in run
    return loop.run_until_complete(
  File "/usr/lib/python3.8/asyncio/base_events.py", line 616, in run_until_complete
    return future.result()
  File "/home/ubuntu/html/env/lib/python3.8/site-packages/prompt_toolkit/application/application.py", line 783, in run_async
    return await _run_async2()
  File "/home/ubuntu/html/env/lib/python3.8/site-packages/prompt_toolkit/application/application.py", line 771, in _run_async2
    await self.cancel_and_wait_for_background_tasks()
  File "/home/ubuntu/html/env/lib/python3.8/site-packages/prompt_toolkit/application/application.py", line 872, in cancel_and_wait_for_background_tasks
    await task
RuntimeError: Task <Task pending name='Task-7' coro=<Application.run_async() running at /home/ubuntu/html/env/lib/python3.8/site-packages/prompt_toolkit/application/application.py:783> cb=[_run_until_complete_cb() at /usr/lib/python3.8/asyncio/base_events.py:184]> got Future <Task pending name='Task-52' coro=<KeyProcessor._start_timeout.<locals>.wait() running at /home/ubuntu/html/env/lib/python3.8/site-packages/prompt_toolkit/key_binding/key_processor.py:406> wait_for=<Future cancelled>> attached to a different loop

versions:

prompt-toolkit==3.0.10
ipdb==0.13.4
ipython==7.19.0

In the meantime pdbpp works.

[werdeil]

While trying to provide a simple script to reproduce I found out a fix: I had the the issue in an environment with prompt-toolkit==3.0.2 and it is resolve by prompt-toolkit==3.0.8.