Worked on the linux-test-project/ltp repository to enhance the reliability of its test suite by addressing a race condition in the pthread_sigmask test. Using C and POSIX Threads, focused on synchronization issues that previously caused threads to hang during pthread_join, which impacted continuous integration stability. The solution involved updating the test harness to post to semaphores before joining threads, ensuring all threads could wake up and exit cleanly. This change improved the consistency of test results and reduced flaky runs, providing faster and more reliable feedback for the project. Emphasized thorough testing and peer review throughout the development process.