Erlang developers know this pattern and OTP design guidelines discourage it. But knowing about it doesn’t prevent it. Researchers found previously unknown instances in production OTP libraries written by experts following the guidelines. And a 2026 OOPSLA paper by Fowler and Hu proves a stronger result: two protocols that are individually deadlock-free can still combine to deadlock in an actor system. The only solutions are restricting each actor to a single session at a time (too limiting for real servers) or building a flow-sensitive type system to thread protocol state through every function call. The problem isn’t that developers write circular calls by accident. It’s that deadlock-freedom doesn’t compose.
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-d "Your flat white is done"。手游是该领域的重要参考
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