Hi,

I know that it is old post but I believe my experience is corresponding
with the mentioned problems:

Every-time when I rearranged internal/external/usb hard disk/s
partition/s (for example for RAID0 array/s blkid always had wrong info).
It happened all the time from natty to precise distro ubuntu. For ubuntu
original compiled kernel from 2.6.x.x to 3.2.x.x versions.

Just small example from today:

blkid|sort
...
/dev/sdl1: LABEL="EFI" UUID="cfb104a6-6b8d-46d1-b75b-1ef00a3f59ef" TYPE="ext2" 
/dev/sdl2: UUID="3c9cec88-bb36-44af-b303-671c8e985d7e" TYPE="swap" 
/dev/sdl3: UUID="6ab6304e-ca1c-f4d0-5749-0a6711686b87" 
UUID_SUB="c56352cc-1535-d113-e3ff-177997f66d65" LABEL="UBU2TBEXT42:raid0ocz" 
TYPE="linux_raid_member" 
/dev/sdm1: UUID="6ab6304e-ca1c-f4d0-5749-0a6711686b87" 
UUID_SUB="751807af-60a3-d541-3476-cc5a31db0d88" LABEL="UBU2TBEXT42:raid0ocz" 
TYPE="linux_raid_member" 
/dev/sdn1: UUID="6ab6304e-ca1c-f4d0-5749-0a6711686b87" 
UUID_SUB="c45ae821-e9f3-aada-a538-d4041ce4db0f" LABEL="UBU2TBEXT42:raid0ocz" 
TYPE="linux_raid_member" 
/dev/sdo1: UUID="6ab6304e-ca1c-f4d0-5749-0a6711686b87" 
UUID_SUB="8eacee1a-3217-7ed7-e22b-76fc61b0bb05" LABEL="UBU2TBEXT42:raid0ocz" 
TYPE="linux_raid_member" 

compared to:
gdisk -l /dev/sdl  /dev/sdm /dev/sdn /dev/sdo
...
Disk identifier (GUID): EF900EC5-4F8E-47D0-875E-6A261FC2F413
...
Number  Start (sector)    End (sector)  Size       Code  Name
   1              34       117226304   55.9 GiB    FD00  PCEUBU1:raid0ocz
...

(just noticed - the same UUID for all four partitions, different label
name )

--- my experience:
gparted - shows wrong labels and UUIDs
gnome disk utility - shows proper information
blkid command - shows wrong information
gdisk - shows proper information
-- for all previous  it happened even after reboot.
-- I remember those problem have appeared in grub prompt either ( when set root 
= (tab key) 
or showing wrong information for blkid in initramfs prompt.

(for blkid: 
before reboot blkid/gparted shows wrong TYPE="" of partition)
after reboot blkid shows properly TYPE="linux_raid_memeber")

(I have created more than 50 RAID0 arrays within last year - it behaves
always the same way for blkid command)

lsb_release -rd
Description:    Ubuntu 12.04 LTS
Release:        12.04

apt-cache policy gparted
gparted:
  Installed: 0.12.1-1~getdeb2~precise
  Candidate: 0.12.1-1~getdeb2~precise
  Version table:
 *** 0.12.1-1~getdeb2~precise 0
        500 http://archive.getdeb.net/ubuntu/ precise-getdeb/apps amd64 Packages
        100 /var/lib/dpkg/status
     0.11.0-2 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

apt-cache policy libblkid1
libblkid1:
  Installed: 2.20.1-1ubuntu3
  Candidate: 2.20.1-1ubuntu3
  Version table:
 *** 2.20.1-1ubuntu3 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status

apt-cache policy util-linux
util-linux:
  Installed: 2.20.1-1ubuntu3
  Candidate: 2.20.1-1ubuntu3
  Version table:
 *** 2.20.1-1ubuntu3 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status

 apt-cache policy gdisk
gdisk:
  Installed: 0.8.1-1build1
  Candidate: 0.8.1-1build1
  Version table:
 *** 0.8.1-1build1 0
        500 http://archive.ubuntu.com/ubuntu/ precise/universe amd64 Packages
        100 /var/lib/dpkg/status

apt-cache policy gnome-disk-utility
gnome-disk-utility:
  Installed: 3.0.2-2ubuntu7
  Candidate: 3.0.2-2ubuntu7
  Version table:
 *** 3.0.2-2ubuntu7 0
        500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status



If you have any further question - please do not hesitate to contact me.
Kind Regards,
M.
P.S. If I missed some information from previous posts - I am sorry - I did not 
read everything.

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https://bugs.launchpad.net/bugs/137314

Title:
  blkid shows outdated / wrong UUID

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