Test: closed/com/oracle/jfr/event/gc/collection/TestGCCauseWithCMSConcurrent.java

# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/scratch/opt/jprt/T/P1/034514.iggy/s/hotspot/src/share/vm/oops/instanceMirrorKlass.inline.hpp:77), pid=28827, tid=7
# assert(java_lang_Class::is_primitive(obj)) failed: Sanity check
#
# JRE version: Java(TM) SE Runtime Environment (9.0) (fastdebug build 9-internal+0-2017-04-20-034514.iggy.8178047)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 9-internal+0-2017-04-20-034514.iggy.8178047, mixed mode, tiered, compressed oops, concurrent mark sweep gc, solaris-amd64)

There is also a deprecation message about CMS. Not sure if that could somehow cause this error. Seems unlikely.