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I have a hard time picturing how an application can be considered anything other than completely broken once a couple threads/workers have deadlocked, so I don't know what any of that quote means. Yeah, I get that browsers isolate tabs and that the damage is contained.

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You seem to be expecting these locks to block a thread, but they do not. A "deadlock" with these locks is simply a chunk of heap space holding a bunch of promises that will never resolve, occupying a few slots in the global event loop's select statement.

Well yes, but some part of code that supposed to run, never runs because of a deadlock.

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