Version

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Summary

We ran into an access violation when using winrt::resume_on_signal. It was caused by a race condition in signal_awaiter::create_threadpool_wait. The method accesses *this after scheduling a "transfer" of the coroutine handle across threads using a threadpool wait. By the time m_state is accessed, a worker thread may have already resumed the coroutine, destroying the signal_awaiter and eventually the coroutine state.

Reproducible example

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Expected behavior

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Actual behavior

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Additional comments

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