> Two examples that I can find

I think you may be misreading my point above. I am not arguing ZFS doesn't have bugs. That's nuts. I am arguing that the bug the parent says he has would be an extraordinary bug.

This is not just a bug that a scrub wouldn't find, but also it is a bug which an fsck would find. And it is not just a bug in the spacemaps or other metadata, but the parent's claim is this is a bug which a scrub, which is just a read, wouldn't see, but a subsequent read would reveal.