The JVM code took a ThreadGroup lock before poking into ThreadGroup fields. Call a method in the ThreadGroup to call the synchronized method instead. Tested with tier 1-4.
------------- Commit messages: - 8296492: Remove ObjectLocker in JVMTI get_subgroups call Changes: https://git.openjdk.org/jdk/pull/11033/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11033&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8296492 Stats: 109 lines in 5 files changed: 30 ins; 67 del; 12 mod Patch: https://git.openjdk.org/jdk/pull/11033.diff Fetch: git fetch https://git.openjdk.org/jdk pull/11033/head:pull/11033 PR: https://git.openjdk.org/jdk/pull/11033
