Worked on the tiiuae/nuttx repository to address a critical kernel stability issue affecting multi-threaded workloads. Focused on kernel development and system programming in C, the work involved hardening file descriptor handling for kernel threads by ensuring they do not duplicate file descriptors from their caller group. This change, delivered through a targeted bug fix, improved the correctness and reliability of kernel thread management by preventing unintended file descriptor duplication. The approach emphasized careful code review, regression-minded debugging, and a clear commit history, resulting in reduced runtime errors and enhanced stability for systems relying on robust kernel thread operations.