This code uses a load barrier while in native state:

V [libjvm.so+0x32616c] AccessInternal::check_access_thread_state()+0xbc
V [libjvm.so+0x19f0eac] JavaThread::threadObj() const+0x1c
V [libjvm.so+0x12edeb7] JvmtiEnv::GetCurrentThreadCpuTime(long*)+0x67
C [libVThreadUnsupportedTest.so+0x1d93] test_unsupported_jvmti_functions+0x343
C [libVThreadUnsupportedTest.so+0x1ee1] VirtualThreadMount+0x71
V [libjvm.so+0x1316aca] JvmtiExport::post_vthread_mount(_jobject*)+0x14a
V [libjvm.so+0x1144190] JVM_VirtualThreadMountEnd+0x230
j java.lang.VirtualThread.notifyJvmtiMountEnd(Z)V+0 java.base@19-internal

This is unsafe because a safepoint might run at the same time, invalidating the oop.

Found with extra checks in the Access API, while running VThreadUnsupportedTest.