Worked on stabilizing memory management in the percona-server repository by addressing a critical edge case in node set handling. Focused on fixing realloc_node_set to correctly preserve the old pointer when the reallocation size is zero, this change prevented potential memory leaks and undefined behavior under memory pressure. The solution involved targeted C++ bug fixing and careful memory management, ensuring safer operation for long-running workloads. Regression tests were updated and executed to validate the zero-size realloc scenario, improving test reliability and release confidence. The work demonstrated depth in diagnosing and resolving low-level memory issues within a complex C++ codebase.