One example:

On AArch64 LSE instructions is not supported on ARMv8 platform.
SIGILL is triggered on ARMv8 platform by the following command:

$ java -XX:+UseLSE -version

OpenJDK 64-Bit Server VM warning: UseLSE specified, but not supported on this CPU
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGILL (0x4) at pc=0x0000ffff76b76088, pid=6950, tid=6951
#
# JRE version: (13.0) (build )
# Java VM: OpenJDK 64-Bit Server VM (13-internal+0-adhoc.yangfei.jdk-jdk, mixed mode, sharing, tiered, compressed oops, g1 gc, linux-aarch64)
# Problematic frame:
# j java.lang.ThreadGroup.add(Ljava/lang/ThreadGroup;)V+0 java.base
#
# 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/hs_err_pid6950.log
Could not load hsdis-aarch64.so; library not loadable; PrintAssembly is disabled
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#
Aborted


Simple fix:

diff -r 1ee9149df76f src/hotspot/cpu/aarch64/vm_version_aarch64.cpp
--- a/src/hotspot/cpu/aarch64/vm_version_aarch64.cpp Mon Feb 25 16:05:06 2019 -0800
+++ b/src/hotspot/cpu/aarch64/vm_version_aarch64.cpp Wed Feb 27 10:44:59 2019 +0800
@@ -258,8 +258,10 @@
   if (FLAG_IS_DEFAULT(UseCRC32)) {
     UseCRC32 = (auxv & HWCAP_CRC32) != 0;
   }
+
   if (UseCRC32 && (auxv & HWCAP_CRC32) == 0) {
     warning("UseCRC32 specified, but not supported on this CPU");
+ FLAG_SET_DEFAULT(UseCRC32, false);
   }

   if (FLAG_IS_DEFAULT(UseAdler32Intrinsics)) {
@@ -277,6 +279,7 @@
   } else {
     if (UseLSE) {
       warning("UseLSE specified, but not supported on this CPU");
+ FLAG_SET_DEFAULT(UseLSE, false);
     }
   }

@@ -291,9 +294,11 @@
   } else {
     if (UseAES) {
       warning("UseAES specified, but not supported on this CPU");
+ FLAG_SET_DEFAULT(UseAES, false);
     }
     if (UseAESIntrinsics) {
       warning("UseAESIntrinsics specified, but not supported on this CPU");
+ FLAG_SET_DEFAULT(UseAESIntrinsics, false);
     }
   }