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Debug Python asyncio Hangs, Blocking Calls and Lost Tasks

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Self-Hosting & Infra intermediate 8 min read $0.01 Updated 2026-10-19

Diagnosis of Python asyncio problems: debug mode and slow-callback warnings, blocking calls in coroutines, unawaited coroutines, fire-and-forget tasks being collected, missing timeouts, gather exceptions and cancellation.

An asyncio program hangs, runs slower than synchronous code, or silently drops errors. Find blocking calls inside the event loop, unawaited coroutines, garbage-collected tasks and missing timeouts.

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#python#asyncio#concurrency#debugging#event-loop

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