Worked on the juicedata/juicefs repository to enhance reliability and correctness in the FUSE layer by addressing a concurrency issue affecting file attribute synchronization. Focused on backend development using Go, the work resolved a race condition in replyAttr that previously led to stale file size reporting under concurrent operations. By implementing improved synchronization and reordering of file attribute updates, the changes ensured accurate file metadata for workloads dependent on precise file sizes. The solution was delivered with clear commit documentation and collaborative sign-offs, reflecting a disciplined approach to code quality and integration. No new features were added during this period.