Worked on the Kamailio repository to address a stability issue affecting musl libc environments, focusing on the TLS code path. Using C programming and system-level multithreading skills, implemented a targeted fix that ensures thread-specific data is initialized before use by creating and deleting a pthread key prior to the diagnostic loop. This approach prevents segmentation faults caused by NULL pointer dereferences, particularly in Alpine-based deployments. The solution enhances reliability and uptime for users running Kamailio on musl systems, demonstrating careful debugging and a deep understanding of cross-platform threading challenges in system programming within a production-grade open source project.