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Possible soundness issue in JobPort::Drop #19

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@gigaroby

While conducting an internal unsafe review, we identified a possible soundness issue in JobPort::Drop

unsafe { CloseHandle(self.completion_port) };

This is highly suspect when combined with #[derive(Clone)] on the struct: any use of Clone is likely to lead to a double-free. This will usually produce a harmless "invalid handle" error which this code will silently ignore, but if either HANDLE value is reused by the kernel before the second clone is dropped, undefined behavior seems possible.

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