Worked on the amzn/rdma-core repository to enhance the reliability of InfiniBand management tooling by addressing a critical issue in low-level systems programming. Focused on device drivers and C, the developer implemented a targeted bug fix in the umad_get_smi_gsi_pairs routine, ensuring that ports with zero GUIDs are now skipped when gathering SMI-GSI pairs. This change prevents tool failures that previously occurred on local InfiniBand interfaces reporting zero GUIDs, improving operational stability. The update did not introduce new user-facing features but directly increased the robustness and usability of management utilities, reducing potential downtime and support incidents in diverse hardware environments.