Please, review the fix for: bug: http://bugs.sun.com/view_bug.do?bug_id=8013945 jbs: https://jbs.oracle.com/bugs/browse/JDK-8013945
Open webrev: http://cr.openjdk.java.net/~sspitsyn/webrevs/2013/hotspot/8013945-JVMTI-JSR292.1/ Summary: CMS calls InstanceKlass::release_C_heap_structures() concurrently.The "delete mnt" needs to take MemberNameTable_lock if !SafepointSynchronize::is_at_safepoint().
Testing: The vm/mlvm and Nashorn tests, the tests listed in the bug report Thanks, Serguei