Here is an excerpt from the log file:

# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/opt/jprt/T/P1/095411.rwestrel/s/hotspot/src/share/vm/opto/phaseX.cpp:345), pid=3016, tid=30
# assert(t == t_no_spec) failed: dead node in hash table or missed node during speculative cleanup
#
# JRE version: Java(TM) SE Runtime Environment (9.0) (build 1.9.0-internal-fastdebug-20150323095411.rwestrel.8069263-b00)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (1.9.0-internal-fastdebug-20150323095411.rwestrel.8069263-b00 mixed mode solaris-amd64 compressed oops)
# Core dump written. Default location: /scratch/local/aurora/sandbox/results/lib_modules_extmodules_jimage_4001_5000/core or core.3016

This problem might be related to JDK-8075921 (the failure appears at the same time), but there is not evidence to support that and more investigation is needed.