Worked on the containers/libkrun repository to address a critical reliability issue in virtio-fs credential handling for containerized environments. Focused on Linux kernel development and Rust, the solution implemented per-thread credential restoration, ensuring that the original UID and GID are preserved during request processing rather than assuming root privileges. This approach prevents guest request failures in unprivileged or non-root deployments by maintaining correct permissions across concurrent threads. Added a regression test to validate ScopedUid restoration in multi-threaded scenarios, improving stability when CAP_SETUID is granted. The work emphasized robust system programming practices, thorough testing, and maintainable, well-documented code changes.