关键词: 飞控软件, 老化缺陷, 缺陷定位, 上下文, 任务树

Abstract:  With the development of aviation industry and the higher complexity of flight control software, the requirements of the reliability and real-time performance become higher. This paper investigates a special type of aging   defects which will affect the reliability and real-time performance of software systems, due to the reason that it will result in the slow response on software systems. However, there is no effective method to address this type of defects for flight control software. Inspired by that, this paper proposes a context based fault localization method. First of all, the main loop of the flight control software is modelled as a task tree, then the repeated running processes of the main loop can be considered as a task tree series. By utilizing Mann-Kendall Test, the time attribute of the central node of the task tree is detected to find the suspicious task. Thereafter, according to the relationship among the task tree series, suspicious tasks are selected to locate defects. The function of suspicious task is the location of the defect. Finally, an experiment is implemented and the results show that the proposed method can not only locate the defect, but also give the call context.

Key words: flight control software, aging defect, fault localization, context, task tree