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 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
#

A DESCRIPTION OF THE PROBLEM :
I ran a modified regression testcase using JDK8u392, I found it crashed under the option -Xcomp, and it will not crashed without the option

# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/data/jdk8u/hotspot/src/share/vm/opto/phaseX.cpp:841), pid=18512, tid=0x00007f01c9848700
# assert(no_dead_loop) failed: dead loop detected
#
# 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 -Xcomp compiler.c2.TestDeadPhiMergeMemLoop

ACTUAL -
688 ConL === 0 [[ 689 ]] #long:56
 669 CastPP === 661 652 [[ 689 671 671 683 689 ]] #double[int:>=0]:NotNull:exact * !jvms: TestDeadPhiMergeMemLoop::main @ bci:208
 786 If === 661 785 [[ 787 788 ]] P=0.000001, C=-1.000000 !orig=[679] !jvms: TestDeadPhiMergeMemLoop::main @ bci:208
 654 ConD === 0 [[ 690 664 683 ]] #dblcon:3.000000
 689 AddP === _ 669 669 688 [[ 690 ]] !jvms: TestDeadPhiMergeMemLoop::main @ bci:208
 787 IfFalse === 786 [[ 690 693 ]] #0 !orig=[680] !jvms: TestDeadPhiMergeMemLoop::main @ bci:208
 690 StoreD === 787 794 689 654 [[ 715 694 794 747 727 ]] @double[int:>=0]:exact+any *, idx=9; Memory: @double[int:>=0]:NotNull:exact[5] *, idx=9; !orig=[709],[741] !jvms: TestDeadPhiMergeMemLoop::main @ bci:208
 794 MergeMem === _ 1 1 1 1 1 1 1 1 690 [[ 608 620 690 694 677 640 658 651 593 593 638 747 727 715 ]] { - - - - - - N690:double[int:>=0]:exact+any * } Memory: @BotPTR *+bot, idx=Bot; !orig=570,[599],[630] !jvms: TestDeadPhiMergeMemLoop::main @ bci:182
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/phaseX.cpp:841
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/data/jdk8u/hotspot/src/share/vm/opto/phaseX.cpp:841), pid=18512, tid=0x00007f01c9848700
# assert(no_dead_loop) failed: dead loop detected
#
# 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/TestDeadPhiMergeMemLoop_09_23_15_00_06/hs_err_pid18512.log
#
# Compiler replay data is saved as:
# /home/repository/toreport/TestDeadPhiMergeMemLoop_09_23_15_00_06/replay_pid18512.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#
Current thread is 139645652600576

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