Creating controllable D state (uninterruptible sleep) processes

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tl;dr: Using vfork() , one can create a process in a D state that is not immune to signal interruption. Using fsfreeze , one can create a process in a D state that is immune to signal interruption. But wait, how can any D state process be "not immune to signal interruption"? Isn't the whole point of D state processes that they are uninterruptible? If you are wondering this, read on, and you will…

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