Developed a D-Bus caller tracing enhancement for the linuxdeepin/dde-session-shell repository, focusing on improving diagnostics for unexpected screen locks and system shutdowns. The feature enables the system to query the process ID of the D-Bus caller and recursively trace its parent process IDs, allowing identification of the originating application responsible for lock or shutdown actions. This approach streamlines troubleshooting by reducing the time required to pinpoint user-facing issues. The implementation leveraged C++ for system programming and D-Bus for inter-process communication, with an emphasis on debugging and maintainability. All changes were documented and linked to a specific commit for traceability.