[Bug 264450] ufs: Partition recognized on 12.3 not recognized on CURRENT (2573e6ced996): Cannot find file system superblock .. Invalid fstype: Invalid argument

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 05 Jun 2022 15:09:05 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264450

--- Comment #10 from Kirk McKusick <mckusick@FreeBSD.org> ---
(In reply to Martin Birgmeier from comment #9)
Code 3 is when an attempt is made to read a block that has a bad magic number.
When disks are added the tasting code looks in up to four places to try and
find a superblock and most of them fail with a bad magic number. So code 3
failures are expected. I probably should not have added that failure code. But
the good news is that you are not getting any other failure codes and you are
able to mount your filesystem. So I did manage to track down the cause of your
failure. Thanks for the 1M image of your filesystem as that is what enabled me
to track down the cause of your failure. I will do some cleanup of the code and
get it checked in.

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