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Chris Lu
b94ad82472
TestPosixFileLocking/ConcurrentLockContention failed in CI (run 24857323067) with ENOENT when re-opening the file after all 8 workers had successfully written and closed. The 20s openWithRetry budget was exhausted, pointing at a real but unproven metaCache/parent-cache coherence issue in the mount under bursts of concurrent Release. Test: hold the initial fd open for the whole subtest; use it for the post-workers Sync() and the verification read. Workers still exercise the concurrent-flock invariant and per-record write correctness; the re-open path is no longer load-bearing. On Eventually failure, dump ReadDir of the parent, Stat, and a fresh O_RDONLY open so a future recurrence has state to debug from. Drop the darwin-only ENOENT t.Skip branches that hid this same flake. Mount: in weedfs.lookupEntry, when returning ENOENT from the "parent cached but child missing" branch, log at Warningf instead of V(4) when the kernel is still tracking this path's inode. That combination is the smoking-gun signal for cache drift and is rare enough in normal use not to spam the log.