dracut in kernel-3.3.5-2.fc16.i686 and kernel-3.3.6-3.fc16.i686 fails to mount root

[JD]

On 05/26/2012 01:25 PM, JD wrote:
> The pertinent failure message in both of these kernels is:
>
> [   29.653980] dracut Warning: No root device 
> "block:/dev/disk/by-uuid/03f82b3c-5163-465b-a4c3-3bcb349a1cc4" found
> [   29.654857] dracut: + emergency_shell No root device 
> "block:/dev/disk/by-uuid/03f82b3c-5163-465b-a4c3-3bcb349a1cc4" found
> [   29.654966] dracut: + set +e
> [   29.655231] dracut: + [ No root device 
> "block:/dev/disk/by-uuid/03f82b3c-5163-465b-a4c3-3bcb349a1cc4" found = 
> -n ]
> [   29.655359] dracut: + _rdshell_name=dracut
> [   29.655443] dracut: + echo
> [   29.655512] dracut:
> [   29.655593] dracut: + echo
> [   29.655661] dracut:
> [   29.655880] dracut: + warn No root device 
> "block:/dev/disk/by-uuid/03f82b3c-5163-465b-a4c3-3bcb349a1cc4" found
> [   29.655984] dracut: + check_quiet
> [   29.656096] dracut: + [ -z yes ]
> [   29.656353] dracut: + echo <28>dracut Warning: No root device 
> "block:/dev/disk/by-uuid/03f82b3c-5163-465b-a4c3-3bcb349a1cc4" found
> [   29.656613] dracut: + echo dracut Warning: No root device 
> "block:/dev/disk/by-uuid/03f82b3c-5163-465b-a4c3-3bcb349a1cc4" found
> [   29.656860] dracut: dracut Warning: No root device 
> "block:/dev/disk/by-uuid/03f82b3c-5163-465b-a4c3-3bcb349a1cc4" found
> [   29.656981] dracut: + source_hook emergency
> [   29.657169] dracut: + source_all /lib/dracut/hooks/emergency
> [   29.657278] dracut: + local f
> [   29.657426] dracut: + [ /lib/dracut/hooks/emergency ]
> [   29.657590] dracut: + [ -d //lib/dracut/hooks/emergency ]
> [   29.657794] dracut: + [ -e 
> //lib/dracut/hooks/emergency/50plymouth-emergency.sh ]
> [   29.660236] dracut: + . 
> //lib/dracut/hooks/emergency/50plymouth-emergency.sh
>
> The system then drops into the shell.
> Bug ID 822792 at bugzilla.redhat.com is about this problem.
> However, I am stuck booting kernel-3.3.4-3.fc16.i686 which does not 
> have this problem.
> I have received no further updates on this problem, which might be 
> unique to my laptop???
> I have also uploaded to the bug the full log of dracut and a file 
> output of rpm -qa in order
> for the devs to see which package might be the culprit.
>
> So, I looked a little further, and found the cause.
> The UUID in /etc/fstab was created by the clean install of fc16 from DVD.
> That uuid is
>
> 259d7b44-1122-42cc-b504-3dd40027d3b9
>
> whereas dracut in the 2 kernels  that are failing to mount root, thinks
> the uuid should be 03f82b3c-5163-465b-a4c3-3bcb349a1cc4
>
> fstab contains the line
>
> UUID=03f82b3c-5163-465b-a4c3-3bcb349a1cc4 /     ext3    
> defaults        0 0
>
> as stated above, kernel kernel-3.3.4-3.fc16.i686
> has no problem mounting root with uuid 
> 03f82b3c-5163-465b-a4c3-3bcb349a1cc4
> So, I guess I will save old fstab, recompute the blkid of all devices 
> in fstab
> and reboot.
>
>
blkid /dev/sda2 yields the same id that
kernel-3.3.5-2.fc16.i686 and kernel-3.3.6-3.fc16.i686
are unable to mount.
So, it seems a different uuid was generated and placed
in the boot/grub2/grub.cfg file when the update was done.