This may relate to JDK-8322957, which has the same assert, but is marked as fixed.

test: serviceability/jvmti/HeapMonitor/MyPackage/HeapMonitorThreadTest.java
JVM args: -XX:+UseZGC -XX:+UnlockExperimentalVMOptions -XX:+UseJVMCICompiler

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/opt/mach5/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S129109/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/df2592fb-f858-44c6-9829-fdca268024a4/runs/561ac77f-4f83-43b4-a19f-8cfe47008dd9/workspace/open/src/hotspot/share/gc/z/zAddress.inline.hpp:488), pid=1626266, tid=1626278
# assert(!is_null(ptr)) failed: not supported
#
# JRE version: Java(TM) SE Runtime Environment (24.0+6) (fastdebug build 24-ea+6-590)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 24-ea+6-590, mixed mode, sharing, tiered, jvmci, jvmci compiler, compressed class ptrs, z gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x1a1959e] ZPointer::is_old_load_good(zpointer)+0x4e
#