That is very true (and a valid concern) but it's hard to understand what the filesystem should do in this case. Seems to me that the best you can hope for is th

That is very true (and a valid concern) but it's hard to understand what the filesystem should do in this case. Seems to me that the best you can hope for is that the data is corrupted in a way that doesn't make "sense" and the filesystem has a check for that, and quits. Other than duplicating the pages (which is certainly a valid approach) how else can you recover from a data stomp?