Public bug reported:
Symptoms: (Ubuntu 9.10 on an ext4 partition /dev/sda1)
1. Booting fails.
2. "mount /dev/sda1" /mnt gives "mount: you must specify the filesystem
type"
but "mount -t ext4 /dev/sda1" is successful
3. blkid /dev/sda1 returns nothing
4. blkid -p /dev/sda1 gives "ambivalent result (probably more
filesystems on the device)"
After installing util-linux-ng-2.17 from source:
5. wipefs /dev/sda1 returns:
offset type
----------------------------------------------------------------
0x410 minix [filesystem]
0x438 ext4 [filesystem]
UUID: d3bb8e26-9798-49ce-bc57-afb6ca62a7ba
I was able to cure the problem by creating a file on "/dev/sda1" and whereby
changing the number of free inodes. See
http://ubuntuforums.org/showthread.php?t=1397193
My diagnosis:
Minix uses the "magic number" 6824 at the location 0x410 to mark a
Minix file system.
0x410 is also the location any ext filesystem uses to record the number of free
inodes.
(The number of free inodes is essentially the number of files you are still
able to create on the file system)
9320 in little endian decoding is "6824"
If the number of free inodes happens to be 9320 plus a multiple of
65536, then the ext filesystem will write 6824 to the 0x410
location.
So many programs will gets confused and don't know whether the files
system is Minix or Ext.
** Affects: ubuntu
Importance: Undecided
Status: New
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mount ext fileystem fails, booting fails, blkid produces no putput
https://bugs.launchpad.net/bugs/518582
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