[Bug 264450] ufs "Cannot find file system superblock" on main 2573e6ced99616f2edccf97fb0f9283a84148246, perfectly usable on 12.3

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264450

            Bug ID: 264450
           Summary: ufs "Cannot find file system superblock" on main
                    2573e6ced99616f2edccf97fb0f9283a84148246, perfectly
                    usable on 12.3
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: d8zNeCFG@aon.at

Created attachment 234446
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=234446&action=edit
First megabyte of da0s4d

Scenario:
- A disk which, if attached to a 12.3 system, shows up as:

[0]# ll /dev/da0*
crw-r-----  1 root  operator  0x75 Jun  4 17:39 /dev/da0
crw-r-----  1 root  operator  0x79 Jun  4 17:39 /dev/da0s1
crw-r-----  1 root  operator  0x7b Jun  4 17:39 /dev/da0s4
crw-r-----  1 root  operator  0x83 Jun  4 17:39 /dev/da0s4a
crw-r-----  1 root  operator  0x84 Jun  4 17:39 /dev/da0s4b
crw-r-----  1 root  operator  0x85 Jun  4 17:39 /dev/da0s4d
[0]# gpart show da0
=>       63  976773105  da0  MBR  (466G)
         63       1985       - free -  (993K)
       2048  761726968    1  ntfs  (363G)
  761729016  215044152    4  freebsd  [active]  (103G)

[0]# gpart show da0s4
=>        0  215044152  da0s4  BSD  (103G)
          0         16         - free -  (8.0K)
         16    4194304      1  freebsd-ufs  (2.0G)
    4194320   10485760      2  freebsd-swap  (5.0G)
   14680080  200364072      4  freebsd-ufs  (96G)

[0]# 

- The two filesystems can be fsck'd o.k.:

0]# fsck /dev/da0s4a
** /dev/da0s4a
** Last Mounted on /d/26s4a
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
3627 files, 131623 used, 376160 free (3256 frags, 46613 blocks, 0.6%
fragmentation)

***** FILE SYSTEM IS CLEAN *****
[0]# fsck /dev/da0s4d
** /dev/da0s4d
** Last Mounted on /d/26s4a/usr
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
1269131 files, 10661916 used, 13593544 free (15728 frags, 1697227 blocks, 0.1%
fragmentation)

***** FILE SYSTEM IS CLEAN *****
[0]# 

- And they can be mounted:

[0]# mount /dev/da0s4a /mnt
[0]# mount /dev/da0s4d /mnt/usr
[0]# umount /mnt/usr
[0]# umount /mnt    
[0]# 

- Now connecting this same disk to a system running main
2573e6ced99616f2edccf97fb0f9283a84148246

Result:
- Now the da0s4d partition is not recognized as a UFS filesystem.
- The partitions do show up:

[0]# ll /dev/da*
crw-r-----  1 root  operator  0x7b Jun  4 17:08 /dev/da0
crw-r-----  1 root  operator  0x5d Jun  4 18:11 /dev/da0s1
crw-r-----  1 root  operator  0x5f Jun  4 18:11 /dev/da0s4
crw-r-----  1 root  operator  0x7d Jun  4 18:11 /dev/da0s4a
crw-r-----  1 root  operator  0x7e Jun  4 18:11 /dev/da0s4b
crw-r-----  1 root  operator  0x7f Jun  4 18:11 /dev/da0s4d
[0]# gpart show da0
=>       63  976773105  da0  MBR  (466G)
         63       1985       - free -  (993K)
       2048  761726968    1  ntfs  (363G)
  761729016  215044152    4  freebsd  [active]  (103G)

[0]# gpart show da0s4
=>        0  215044152  da0s4  BSD  (103G)
          0         16         - free -  (8.0K)
         16    4194304      1  freebsd-ufs  (2.0G)
    4194320   10485760      2  freebsd-swap  (5.0G)
   14680080  200364072      4  freebsd-ufs  (96G)

[0]# 

- But fsck'ing yields:

[0]# fsck /dev/da0s4a
** /dev/da0s4a

ADD SUPERBLOCK CHECK-HASH PROTECTION? [yn] n


ADD INODE CHECK-HASH PROTECTION? [yn] n

** Last Mounted on /mnt
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
3627 files, 131623 used, 376160 free (3256 frags, 46613 blocks, 0.6%
fragmentation)

***** FILE SYSTEM IS CLEAN *****
[0]# fsck /dev/da0s4d
Cannot find file system superblock
Cannot find file system superblock

LOOK FOR ALTERNATE SUPERBLOCKS? no

[8]# 

- And trying to mount yields:

[8]# mount /dev/da0s4a /mnt
[0]# mount /dev/da0s4d /mnt/usr
mount: /dev/da0s4d: Invalid fstype: Invalid argument
[1]# umount /mnt               
[0]# 

Expected result:
- da0s4d should be usable under main as well.

Note:
- The first megabyte of da0s4d is attached. It hopefully suffices to find out
why the superblock is not accepted on main.

-- Martin

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