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Date:      Fri, 12 Jun 2026 14:15:04 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 296022] FreeBSD can't mount NetBSD FFSv2 partitions
Message-ID:  <bug-296022-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=296022

            Bug ID: 296022
           Summary: FreeBSD can't mount NetBSD FFSv2 partitions
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: rbranco@suse.com

We can mount OpenBSD's just fine but for partitions created in NetBSD 10.0+ we
get:

$ sudo mount -r /dev/ada0p5 /mnt
mount: /dev/ada0p5: No such file or directory

And this line on dmesg:
[969] UFS2 superblock failed: fs->fs_metaspace (131072) > fs->fs_fpg / 2
(94980)

The check was added in this commit: d22531d572829

I also tried this command on NetBSD to convert the fs to support extattrs and
ACLs:
# fsck_ffs -c ea /
https://man.netbsd.org/fsck_ffs.8

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