Clearing the next bitmap may be interrupted by full GCs, effectively aborting marking. However, after that full GC, continuing to clear the next bitmap causes crashes if the mark bitmap has been decommitted during that full GC.
This CR has been intended to be broken out from the change for JDK-8038423. However to make this work, we would need additional new soon-to-be removed code. So I am closing this issue.
Without the JDK-8038423 this results in additional useless work done as the full gc already cleared the next mark bitmap.