JDK-8291555 phased out UseHeavyMonitors in favor of LockingMode=0. We forgot to apply these changes to PPC and S390. Since UseHeavyMonitors implies LockingMode, but not vice versa, we now have a mismatch if JVM is started with LockingMode=0 but without UseHeavyMonitors. That leads to crashes.
relates to
JDK-8291555Implement alternative fast-locking scheme