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A hang is usually one of four things: a blocked runtime thread, a lock held across an await, a future that never wakes or a channel nobody closes. Here is the order to check them.
A task that hangs forever has a short list of causes: a channel sender that never drops, an await on a lock held across an await, a blocked worker, a missing timeout, or a lost wake-up.
A map of Rust debugging tools in the order to reach for them: compiler messages, dbg!, tests, backtraces, tracing, a debugger and sanitizers, with when each one wins.