The ServiceThread has a list of all the OopStorage objects it needs to visit to perform cleanup actions (calling delete_empty_block) on them. A couple of OopStorage objects have been recently added to the VM but not added to the ServiceThread's list. One was added for the resolved method table by
JDK-8221393. Another was added for JVMCI by JDK-8220623 (for which the accessor is currently private).