Eager task factory segfaults when hosting and calling an API from the same event loop #122332
Description
Crash report
What happened?
Love eager task factory, but it's crashing one of my tests. I'm using uvicorn and fastapi to host an API, and testing it with httpx running in the same event loop. This reliably produces a segfault.
It seems to only happen with streaming responses.
Here's a minimal code example:
import asyncio
import httpx
import uvicorn
from fastapi import FastAPI
from starlette.responses import StreamingResponse
async def main():
loop = asyncio.get_running_loop()
loop.set_task_factory(asyncio.eager_task_factory)
app = FastAPI()
@app.get("/")
async def get():
async def _():
yield "1"
return StreamingResponse(
_(),
)
server = uvicorn.Server(
uvicorn.Config(
app,
host="0.0.0.0",
port=8080,
)
)
asyncio.create_task(server.serve())
client = httpx.AsyncClient()
await client.get("http://localhost:8080")
if __name__ == "__main__":
asyncio.run(main())CPython versions tested on:
3.12
Operating systems tested on:
macOS
Output from running 'python -VV' on the command line:
Python 3.12.3 | packaged by conda-forge | (main, Apr 15 2024, 18:35:20) [Clang 16.0.6 ]