serviceability/jvmti/vthread/SuspendResume1/SuspendResume1.java
serviceability/jvmti/vthread/VThreadTest/VThreadTest.java

Failed without Loom enabled.

To reproduce:
make CONF=linux-x86_64-server-fastdebug TEST_VM_OPTS="-XX:+UseShenandoahGC -XX:+UnlockExperimentalVMOptions -XX:ShenandoahGCMode=iu" run-test TEST=hotspot_loom

#
#  Internal Error (/home/zgu/ws/jdk/src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp:2666), pid=717559, tid=717606
#  Error: assert(new_mem->outcnt() > 0) failed
#
# JRE version: OpenJDK Runtime Environment (19.0) (fastdebug build 19-internal-adhoc.zgu.jdk)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 19-internal-adhoc.zgu.jdk, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, shenandoah gc, linux-amd64)
# Problematic frame:
# V  [libjvm.so+0x1a17564]  MemoryGraphFixer::fix_mem(Node*, Node*, Node*, Node*, Node*, Unique_Node_List&)+0xc14