In latest PIT of hs25.40 several jtreg tests failed due to exceeded timeout.
Performed analysis showed that execution time of following tests increased significantly comparing to jdk8u40-b04:
For example, java/util/regex/RegExTest.java take ~ 2minutes to finish with jdk8u40-b04 and ~ 15 minutes with PIT build.
Issue could be reproduced with Xcomp and +TieredCompilation. It seems like only compilation on tier 3 is affected: with -TieredCompilation and -XX:TieredStopAtLevel=2 execution time is the same as with 8u40-b04.