All failures seen so far happened with Generational ZGC.

Sample out:

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (<workspace>/open/src/hotspot/share/gc/z/zAddress.inline.hpp:491), pid=21129, tid=21136
# assert(!is_null(ptr)) failed: not supported
#
# JRE version: Java(TM) SE Runtime Environment (22.0+27) (fastdebug build 22-ea+27-2262)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 22-ea+27-2262, mixed mode, sharing, tiered, compressed class ptrs, z gc, linux-aarch64)
# Problematic frame:
# V [libjvm.so+0x17e5b30] ZPointer::is_old_load_good(zpointer)+0x60
#
# Core dump will be written. Default location: Core dumps may be processed with "/opt/core.sh %p" (or dumping to <scratch>/1/core.21129)
#
# An error report file with more information is saved as:
# <scratch>/jtreg_open_test_jdk_jdk_jfr/scratch/1/hs_err_pid21129.log
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#