Always reproducible on aarch64 linux platform with jdk14 slowdebug build.  

Reduced fuzz testcase :

public class Test {

    public static final int N = 400;
    public static byte bArr[] = new byte[N];
    public static int  iArr[] = new int[N];
    public static long lArr[] = new long[N];

    public static void vMeth(byte bArg, int iArg, long lArg) {
        int i = N - 1;
        do {
            iArr[i - 1] += iArg;
            iArr[i] += iArg;
            lArr[i - 1] = lArg;
            bArr[i - 1] = bArg;
        } while (--i > 0);
    }

    public void mainTest() {
        byte b = 0;
        int  i = 0;
        long l = 0;
        for (int j = 0; j < N; ++j) {
            vMeth(b, i, l);
        }
    }

    public static void main(String[] args) {
            Test _instance = new Test();
            for (int i = 0; i < 10; i++) {
                _instance.mainTest();
            }
    }

}

Command line: java -XX:CompileCommand=compileonly,Test::vMeth -XX:-TieredCompilation -XX:-BackgroundCompilation -XX:-UseOnStackReplacement Test

CompileCommand: compileonly Test.vMeth
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x0000ffffa90bb9ec, pid=11975, tid=11986
#
# JRE version: OpenJDK Runtime Environment (14.0) (slowdebug build 14-internal+0-adhoc.yangfei.openjdk-jdk)
# Java VM: OpenJDK 64-Bit Server VM (slowdebug 14-internal+0-adhoc.yangfei.openjdk-jdk, mixed mode, sharing, compressed oops, g1 gc, linux-aarch64)
# Problematic frame:
# V  [libjvm.so+0x3149ec]  Node::in(unsigned int) const+0x14
#
# No core dump will be written. 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/yangfei/114/hs_err_pid11975.log
#
# Compiler replay data is saved as:
# /home/yangfei/114/replay_pid11975.log
#
# If you would like to submit a bug report, please visit:
#   https://bugreport.java.com/bugreport/crash.jsp
#
Current thread is 11986
Dumping core ...
Aborted

Call trace:

  24 ---------------  T H R E A D  ---------------
  25
  26 Current thread (0x000000003c24d000):  JavaThread "C2 CompilerThread0" daemon [_thread_in_native, id=11986, stack(0x0000ffff4e8dc000,0x0000ffff4eadd000)]
  27
  28
  29 Current CompileTask:
  30 C2:    573    1    b        Test::vMeth (54 bytes)
  31
  32 Stack: [0x0000ffff4e8dc000,0x0000ffff4eadd000],  sp=0x0000ffff4ead66d0,  free space=2025k
  33 Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
  34 V  [libjvm.so+0x3149ec]  Node::in(unsigned int) const+0x14
  35 V  [libjvm.so+0x1049cb4]  SWPointer::SWPointer(MemNode*, SuperWord*, Node_Stack*, bool)+0xb0
  36 V  [libjvm.so+0x1048ea0]  SuperWord::align_initial_loop_index(MemNode*)+0x228
  37 V  [libjvm.so+0x1043f3c]  SuperWord::output()+0xf4
  38 V  [libjvm.so+0x103c514]  SuperWord::SLP_extract()+0x4f4
  39 V  [libjvm.so+0x103b2c8]  SuperWord::transform_loop(IdealLoopTree*, bool)+0x4f8
  40 V  [libjvm.so+0xcb8a7c]  PhaseIdealLoop::build_and_optimize(LoopOptsMode)+0x1268
  41 V  [libjvm.so+0x6a23d4]  PhaseIdealLoop::PhaseIdealLoop(PhaseIterGVN&, LoopOptsMode)+0x94
  42 V  [libjvm.so+0x6a2494]  PhaseIdealLoop::optimize(PhaseIterGVN&, LoopOptsMode)+0x2c
  43 V  [libjvm.so+0x695840]  Compile::optimize_loops(PhaseIterGVN&, LoopOptsMode)+0xb8
  44 V  [libjvm.so+0x69656c]  Compile::Optimize()+0xb74
  45 V  [libjvm.so+0x68fab4]  Compile::Compile(ciEnv*, C2Compiler*, ciMethod*, int, bool, bool, bool, DirectiveSet*)+0xd4c
  46 V  [libjvm.so+0x58deb8]  C2Compiler::compile_method(ciEnv*, ciMethod*, int, DirectiveSet*)+0x134
  47 V  [libjvm.so+0x6abf10]  CompileBroker::invoke_compiler_on_method(CompileTask*)+0x668
  48 V  [libjvm.so+0x6aacdc]  CompileBroker::compiler_thread_loop()+0x364
  49 V  [libjvm.so+0x10abd8c]  compiler_thread_entry(JavaThread*, Thread*)+0x80
  50 V  [libjvm.so+0x10a7168]  JavaThread::thread_main_inner()+0x170
  51 V  [libjvm.so+0x10a6fec]  JavaThread::run()+0x130
  52 V  [libjvm.so+0x10a2ea8]  Thread::call_run()+0x1a8
  53 V  [libjvm.so+0xe158b4]  thread_native_entry(Thread*)+0x1dc
  54 C  [libpthread.so.0+0x6dc4]  start_thread+0xa4