diff -r a8e43293b4c4 -r 274ba8fbd96d src/hotspot/share/jvmci/jvmciCompilerToVM.cpp
--- a/src/hotspot/share/jvmci/jvmciCompilerToVM.cpp	Mon Oct 29 08:38:59 2018 -0400
+++ b/src/hotspot/share/jvmci/jvmciCompilerToVM.cpp	Mon Oct 29 10:21:34 2018 -0400
@@ -627,6 +627,7 @@
 C2V_VMENTRY(jboolean, hasFinalizableSubclass,(JNIEnv *, jobject, jobject jvmci_type))
   Klass* klass = CompilerToVM::asKlass(jvmci_type);
   assert(klass != NULL, "method must not be called for primitive types");
+  MutexLocker ml(Compile_lock);
   return Dependencies::find_finalizable_subclass(klass) != NULL;
 C2V_END