Worked on stability and concurrency improvements for the ntop/nDPI repository, focusing on a critical bug fix rather than new feature development. Addressed a crash scenario in NdpiReader’s protocol guessing path by replacing a shared thread-0 context with a per-thread ndpi_struct, effectively eliminating race conditions during multi-core execution. This change enhanced the reliability of deep packet inspection processing under high concurrency, ensuring safer multi-threaded operation. The work involved C programming and leveraged expertise in multi-threading and network protocol analysis, prioritizing code quality and robust handling of parallel workloads to reduce crash risk and improve overall system stability in production environments.