Attached test crashes with
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (open/src/hotspot/share/opto/superword.hpp:358), pid=15949, tid=15960
# assert(in_bb(n)) failed: must be
#
# JRE version: Java(TM) SE Runtime Environment (14.0+20) (fastdebug build 14-ea+20-879)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 14-ea+20-879, compiled mode, sharing, tiered, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x165ef71] SuperWord::bb_idx(Node*)+0x41
#
# Core dump will be written. Default location: Core dumps may be processed with "/usr/libexec/abrt-hook-ccpp %s %c %p %u %g %t e %P %I %h" (or dumping to /tmp/fuzzer.tmp.K4CDlMZW6b/core.15949)
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#

--------------- S U M M A R Y ------------

Command Line: -Xmx1G -Xcomp -Xbatch -XX:CompileOnly=Test Test

Host:, Intel(R) Xeon(R) CPU E5-2690 0 @ 2.90GHz, 4 cores, 14G, Oracle Linux Server release 7.5
Time: Fri Oct 25 09:08:38 2019 UTC elapsed time: 0 seconds (0d 0h 0m 0s)

--------------- T H R E A D ---------------

Current thread (0x00007f7e54257800): JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=15960, stack(0x00007f7e2aff5000,0x00007f7e2b0f6000)]


Current CompileTask:
C2: 237 10 b 4 Test::mainTest (579 bytes)

Stack: [0x00007f7e2aff5000,0x00007f7e2b0f6000], sp=0x00007f7e2b0f0200, free space=1004k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x165ef71] SuperWord::bb_idx(Node*)+0x41
V [libjvm.so+0x164f0ef] SuperWord::independent(Node*, Node*)+0x1f
V [libjvm.so+0x1650119] SuperWord::co_locate_pack(Node_List*)+0xef9
V [libjvm.so+0x16503fd] SuperWord::schedule()+0x2d
V [libjvm.so+0x165e42a] SuperWord::SLP_extract()+0x22a
V [libjvm.so+0x165e950] SuperWord::transform_loop(IdealLoopTree*, bool)+0x220
V [libjvm.so+0x1200105] PhaseIdealLoop::build_and_optimize(LoopOptsMode)+0x1155
V [libjvm.so+0x9d63da] PhaseIdealLoop::optimize(PhaseIterGVN&, LoopOptsMode)+0x2ea
V [libjvm.so+0x9d366c] Compile::Optimize()+0xadc
V [libjvm.so+0x9d4c34] Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool, DirectiveSet*)+0x1094
V [libjvm.so+0x81b760] C2Compiler::compile_method(ciEnv*, ciMethod*, int, DirectiveSet*)+0x110
V [libjvm.so+0x9e104c] CompileBroker::invoke_compiler_on_method(CompileTask*)+0x2cc
V [libjvm.so+0x9e1ff8] CompileBroker::compiler_thread_loop()+0x468
V [libjvm.so+0x16ece36] JavaThread::thread_main_inner()+0x226
V [libjvm.so+0x16f2626] Thread::call_run()+0xf6
V [libjvm.so+0x14150ae] thread_native_entry(Thread*)+0x10e