hs nightly build(2016-06-17) got SIGSEGV with following options on Linux-x64 with Ubuntu 16.04 OS: '-XX:+UseSharedSpaces -XX:+UseStringDeduplication -version' or '-XX:+RequireSharedSpaces -XX:+UseStringDeduplication -version'

java -XX:+UseSharedSpaces -XX:+UseStringDeduplication -version
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007f1cb4d80f80, pid=17441, tid=17455
#
# JRE version: Java(TM) SE Runtime Environment (9.0) (fastdebug build 9-internal+0-2016-06-17-185941.dfazunen.hs-int)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 9-internal+0-2016-06-17-185941.dfazunen.hs-int, mixed mode, sharing, tiered, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0xde3f80] java_lang_String::is_instance(oop)+0xa0
#
# Core dump will be written. Default location: Core dumps may be processed with "/usr/share/apport/apport %p %s %c %P" (or dumping to /home/ddmitriev/work/nightly_bundles/nightly.2016-06-20/fastdebug/bin/core.17441)
#

hs_err_pid3459.log and hs_err_pid590.log are attached.

Also, it is needed to dump CDS before calling java with '-XX:+UseSharedSpaces -XX:+UseStringDeduplication' options, i.e.:
java -Xshare:dump
java -XX:+UseSharedSpaces -XX:+UseStringDeduplication -version