Re: fsck updating but not fixing filesystem

[David Brownlee <abs%absd.org@localhost>]

On Mon, 24 Aug 2020 at 11:46, Mouse <mouse%rodents-montreal.org@localhost> wrote:
>
> > I think the general consensus is that ffs can be inconsistent it ways
> > fsck is unable to detect.
>
> ...much less fix.  Yes.  When I was doing the program that eventually
> got massaged into resize_ffs, during development I had some filesystems
> that were definitely corrupted but that fsck was happy with.  (I rather
> wish I'd saved some of them as test cases, but I didn't.)

Sounds like there is an in interesting fuzzing project in there for
someone - make a filesystem mage and the repeatedly damage it, then
see if fsck can fix it, then if you get a rump panic when moving
everything around, and then re-run fsck to see if it indicates any new
issues :)

(So far 3.5TB of my original RAID1 filesystem transferred to a plain
disk, so should be able to run some A/B fsck tests later today to
establish if the raid controller is the issue in this case)

David


David