java/util/concurrent/ThreadPoolExecutor/CoreThreadTimeOut.java has 2 wrong assumptions:
1) test assumes that 10 tested threads won't finish in 30 milliseconds
2) test assumes that 10 tested threads will finish in 10 seconds

both assumptions are hw- and system- specific. Depending on system load and hw capabilities these time metrics might be wrong. Test needs to be re-organized to not rely on hardcoded timeouts.