The service process always interrupts abnormally after certain requests

[TheHonestBob]

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Description

I deployed a dataframe data service using FastAPI. When I used the df.parallel_apply method instead of df.apply, the service always terminated abnormally. The same request for df.apply did not encounter this problem. When I started the program using the following command and checked the logs,:
uvicorn server:app --port=49000 --host=0.0.0.0 --access-log --log-level=trace
I found the following problem. It seems that when I started processing dataframe data through multiple processes, for some unknown reason,the program sent a shutdown signal to the ASGI server

Example Code

No response

Python, Uvicorn & OS Version

Running uvicorn 0.27.0.post1 with CPython 3.9.18 on Linux

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