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got Future <Future pending> attached to a different loop

See original GitHub issue

First Check

I added a very descriptive title to this issue.
I used the GitHub search to find a similar issue and didn’t find it.
I searched the FastAPI documentation, with the integrated search.
I already searched in Google “How to X in FastAPI” and didn’t find any information.
I already read and followed all the tutorial in the docs and didn’t find an answer.
I already checked if it is not related to FastAPI but to Pydantic.
I already checked if it is not related to FastAPI but to Swagger UI.
I already checked if it is not related to FastAPI but to ReDoc.

Commit to Help

I commit to help with one of those options 👆

Example Code

def main():
  uvicorn.run(app,host="0.0.0.0",port=8090,loop="asyncio")
loop = asyncio.get_event_loop()
def run():
  loop.run_until_complete(main())

def keep_alive1():
    t = threading.Thread(target=run)
    t.start()

keep_alive1()


client.run('discord bot token')

Description

i was using discord client with fastapi i used another thread for running uvicorn. the bot worked fine but when i used the fastapi endpoints it gave me an error

RuntimeError: Task <Task pending name='Task-32' coro=<RequestResponseCycle.run_asgi() running at /opt/virtualenvs/python3/lib/python3.8/site-packages/uvicorn/protocols/http/h11_impl.py:369> cb=[set.discard()]> got Future <Future pending> attached to a different loop

the endpoint that gave me this error was asynchronous using mongodb module motor, other non asynchronous endpoints worked fine like the /docs.

when i removed the discord client with just the fastapi it still didnt worked with uvicorn.run() but did worked with the cmd command uvicorn main:app not sure why tho.