Observed in testing environment on aarch64:
```
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x0000ffff98977070, pid=7523, tid=7535
#
# JRE version: OpenJDK Runtime Environment (27.0) (fastdebug build 27-root-add-degen-penalty-gh.3f12ff15837)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 27-root-add-degen-penalty-gh.3f12ff15837, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, shenandoah gc, linux-aarch64)
# Problematic frame:
# V [libjvm.so+0x1806070] ShenandoahGenerationalControlThread::prepare_for_concurrent_gc(ShenandoahGenerationalControlThread::ShenandoahGCRequest const&) const+0x28
#
```