Fuzzing scheduler CFS

I am very interested in finding bugs in such code. In such large projects which method you recommend to seek effective error? I do not necessarily insist on the method of fuzzing, it is one of the options. the answer to your question: The scheduler  should work very quickly, and this demonstrates the quality and level of the algorithm. I would like to improve the code, but has not found a practical method of finding errors. Thank you very much for your reply!