On Fri, 24 Sep 2021 13:13:39 GMT, Lin Zang <lz...@openjdk.org> wrote:
> The root cause for crash in ZGC is that the JNIHandles are processed before > object iteration. And ZGC would update the JNIHandles at object iteration > with read barrier. So the crash is cause by accessing the invalid address > which can be dummy info after zgc, and hence crash. > > The lock rank issue can be fixed because the related mutexes are acquired in > safepoint. so the safepoint_check_required could be safepoint_check_always. > > The Epsilon issue is caused by wrong _num_dumper_thread calculated when the > gang==NULL. @linzang and @coleenp - I've ProblemListed the test via: JDK-8274294 ProblemList sun/tools/jmap/BasicJMapTest.java to give you folks time to sort thru the details. ------------- PR: https://git.openjdk.java.net/jdk/pull/5681
