Schneems/debug deadlock #63
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When set, an env var will spawn a background thread that sleeps for the given amount of time. At the end of that timeout period it will print the backtrace for all threads that are alive, this should point to the location where the code is frozen.
The mutex file in the reaper is used to ensure that only one process will try to destroy apps given a multi process system. This is accomplished via an `ensure` block. However this `ensure` block only fires when the context is exited, and in the case where `retry` fires, `ensure` is skipped. This PR attempts to avoid deadlock by ensuring that the mutex file is closed even when `retry` is called.
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