waitForMount probed the mount point with stat+ReadDir, which a bare local
directory also passes, so Setup could return before the weed mount process
finished mounting. Tests then wrote to the local disk underneath the mount
point; when the mount activated it shadowed those files, producing the
intermittent TestConcurrentFileOperations/ConcurrentReadWrite ENOENT with
an empty ReadDir. Require the mount point's device ID to differ from its
parent's before reporting ready.
Chris LuandGitHub
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