fix: eliminate TOCTOU race in RunState.load() - #3908
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Remove exists() pre-check and wrap open() in try/except FileNotFoundError to provide a clear custom error message even under race conditions.
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Problem
RunState.load()checksexists()then callsopen(). Between the two calls the file can be deleted, causing a rawFileNotFoundErrorinstead of the intended custom message.Fix
Remove the
exists()pre-check and wrapopen()intry/except FileNotFoundError.Testing