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Async and Multi-Threaded Debugging: Parallel Stacks, the Tasks Window, Deadlocks and Race Conditions

In an async hang, the waiting code isn't on any thread's stack; you need the Tasks view of Parallel Stacks or the async chain in a dump. We read a lock-order deadlock and a .Result sync-over-async deadlock through dotnet-stack output, measure thread pool starvation, show Dictionary, counter and check-then-act race conditions with real runs, and explain forcing a race with freeze/thaw.