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Chris LuandGitHub
4527947afc
WriteFile's own existence probe runs while the file does not exist, and WinFsp may serve that answer from its metadata cache for up to the mount's FileInfoTimeout. A reader racing into that window failed its open with not-found, which is the cache being a cache, not a defect in concurrent reading. Establish visibility once before racing the readers, so the test exercises what it is named for.