FastAPI / asyncio: RuntimeError: Event loop is closed
RuntimeError: Event loop is closed at asyncio.base_events.BaseEventLoop._check_closed (base_events.py:510)
Immediate Remediation
bash
Avoid `asyncio.run()` inside an already active event loop (e.g. Celery or Uvicorn); use `asyncio.get_running_loop().create_task()`.
Root Cause Analysis
Encountered in FastAPI / asyncio when standard configuration or runtime constraints are violated.
Verification & Guardrails
- Verify dependencies and runtime version compatibility.
- Ensure clean build artifact state.
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