The VM fails to detect some invalid class files, or some invalid class files combinations. Detection code is sometime executed too late, which is causing some crashes after JDK-8326598 (field inheritance for value classes).

This is due to some missing or misplaces checks in the VM, and also by the lack of tests stressing those invalid scenarios (many such tests have been disabled during the transition to JEP 401 model, because the model has changed significantly and they have to be rewritten).