The -XX:-NearCpool -XX:+UseShenandoahGC JVM run gives an immediate crash on aarch64 (and riscv):

$ ~/jdk-21/bin/java -XX:-NearCpool -XX:+UseShenandoahGC
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x0000ffff6fd4b4c4, pid=508304, tid=508305
#
# JRE version: OpenJDK Runtime Environment (21.0+37) (build 21+37-LTS)
# Java VM: OpenJDK 64-Bit Server VM (21+37-LTS, mixed mode, tiered, compressed oops, compressed class ptrs, shenandoah gc, linux-aarch64)
# Problematic frame:
# j java.lang.module.ModuleDescriptor.<init>(Ljava/lang/String;Ljava/lang/module/ModuleDescriptor$Version;Ljava/util/Set;Ljava/util/Set;Ljava/util/Set;Ljava/util/Set;Ljava/util/Set;Ljava/util/Set;Ljava/util/Set;Ljava/lang/String;IZ)V+29 java.base
#
# Core dump will be written. Default location: Core dumps may be processed with "/bin/false" (or dumping to /home/bellsoft/boris/jdk-bulasevich/core.508304)
#