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A deep technical analysis of 'snoozing' in async Rust — when a future that has requested a wakeup is not polled again, causing deadlocks (futurelocks). The post distinguishes snoozing from cancellation and starvation, walks through concrete deadlock examples using poll!, select!-by-reference, buffered streams, and FuturesUnordered, and draws parallels to thread-level hazards like SuspendThread and Unix signal handlers. It proposes practical rules for avoiding snoozing: don't pin things in async functions, don't use references to futures as futures themselves, and advocates for changes to the Stream trait (adding poll_progress or deprecating buffered/next). An experimental crate join_me_maybe is introduced as a safer alternative to select!-by-reference patterns.

Never snooze a future