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fix(mount): copy xattr value bytes to avoid FUSE buffer aliasing (#9275) SetXAttr stored the caller-supplied `data` slice directly into entry.Extended. That slice aliases go-fuse's per-request input buffer, which is returned to a pool the moment the handler returns. When a file is open during setxattr (the open-fh path defers persistence to flush), the next FUSE request recycles the buffer and silently overwrites the stored xattr bytes; flushMetadataToFiler then ships the corrupted bytes to the filer. `cp -a` reproduces this because it issues a setxattr while holding an open fh, then continues to issue follow-up FUSE ops that reuse the same buffer. The path-based setxattr (e.g. setfattr without an open fh) saves synchronously inside the same handler, so the bytes were marshalled before the buffer could be reused — that is why the source file in the report looked fine and only the cp -a destination was garbage. Defensively copy the bytes when storing them, and add a unit test that mutates the caller buffer after SetXAttr returns to lock in the invariant.