ADDITIONAL SYSTEM INFORMATION :
# JRE version: OpenJDK Runtime Environment (8.0_392) (build 1.8.0_392-internal-fastdebug--b00)
# Java VM: OpenJDK 64-Bit Server VM (25.392-b00-fastdebug mixed mode linux-amd64 compressed oops)

A DESCRIPTION OF THE PROBLEM :
I ran a regression testcase on JDK8u392 and found that the JVM crashed without any options.
But strangely enough, it works fine when I add the -Xcomp option. Then I made some changes to the regression test code that would allow it to still crash when using the -Xcomp option.

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/data//jdk8u/hotspot/src/share/vm/opto/matcher.cpp:1797), pid=16408, tid=0x00007f0164535700
# assert(mem == (Node*)1 || mem == mem2) failed: multiple Memories being matched at once?
#
# JRE version: OpenJDK Runtime Environment (8.0_392) (build 1.8.0_392-internal-fastdebug--b00)
# Java VM: OpenJDK 64-Bit Server VM (25.392-b00-fastdebug compiled mode linux-amd64 compressed oops)
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
java compiler.codegen.TestMultiMemInstructionMatching

ACTUAL -
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/matcher.cpp:1797
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/data//jdk8u/hotspot/src/share/vm/opto/matcher.cpp:1797), pid=16408, tid=0x00007f0164535700
# assert(mem == (Node*)1 || mem == mem2) failed: multiple Memories being matched at once?
#
# JRE version: OpenJDK Runtime Environment (8.0_392) (build 1.8.0_392-internal-fastdebug--b00)
# Java VM: OpenJDK 64-Bit Server VM (25.392-b00-fastdebug compiled mode linux-amd64 compressed oops)
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /home//repository//toreport/TestMultiMemInstructionMatching_09_24_00_04_45/hs_err_pid16408.log
#
# Compiler replay data is saved as:
# /home//repository//toreport/TestMultiMemInstructionMatching_09_24_00_04_45/replay_pid16408.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#

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