RaceFixer -- An Automated Data Race Fixer

Fixing software bugs has always been an essential and time-consuming process in software development. Fixing concurrency bugs has become especially critical in the multicore era. However, fixing concurrency bugs is challenging due to non-deterministic failures and tricky parallel reasoning. Beyond correctly fixing the original problem in the software, a good patch should also avoid introducing new bugs, degrading performance unnecessarily, or damaging software readability. Existing tools cannot automate the whole fixing process and provide good-quality patches. We present RaceFixer, a tool that automates the process of fixing one common type of concurrency bug: single-variable atomicity violations. RaceFixer starts from the bug reports of an existing bug-detection tool ThreadSanitizer. It augments these with static analysis to construct a suitable patch for each bug report. It tries to combine the patches of multiple bugs for better performance and code readability. Finally, we test RaceFixer on benchmarks from TheadSanitizer.