Kernel panic (was Re: kernel-3.19.3-200.fc21.x86_64 fails to boot)

[Patrick O'Callaghan]

On Sat, 2015-04-04 at 07:52 -0400, Paul Cartwright wrote:
> On 04/04/2015 07:45 AM, Patrick O'Callaghan wrote:
> > Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block (0,0)
> >
> > Maybe something wrong in grub.conf? The previous kernel boots fine.
> >
> > poc
> my entries show UUID, not block..
>         linux16 /boot/vmlinuz-3.17.4-301.fc21.x86_64 root=/dev/sdb5 ro
> rhgb quiet LANG=en_US.UTF-8
>         set root='hd1,msdos5'

Mine all use UUID. These are the two entries (not working, working):

menuentry 'Fedora (3.19.3-200.fc21.x86_64) 21 (Twenty One)' --class
fedora --class gnu-linux --class gnu --class os $menuentry_id_option
'gnul
inux-3.13.5-202.fc20.x86_64-advanced-6a9a800c-309b-4b69-b269-884ad495e7b9' { 
       set gfxpayload=text 
       insmod gzio 
       insmod part_msdos 
       insmod ext2 
       set root='hd0,msdos1' 
       if [ x$feature_platform_search_hint = xy ]; then 
         search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1
--hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos
1'  6d5929d8-fd35-49e6-a8bf-aab5309dad77 
       else 
         search --no-floppy --fs-uuid --set=root
6d5929d8-fd35-49e6-a8bf-aab5309dad77 
       fi 
       linux   /vmlinuz-3.19.3-200.fc21.x86_64
root=UUID=6a9a800c-309b-4b69-b269-884ad495e7b9 ro
vconsole.font=latarcyrheb-sun16  rhgb quiet 
nouveau.modeset=0 rd.driver.blacklist=nouveau video=vesa:off
LANG=en_GB.UTF-8 
} 
menuentry 'Fedora (3.19.2-201.fc21.x86_64) 21 (Twenty One)' --class
fedora --class gnu-linux --class gnu --class os $menuentry_id_option
'gnul
inux-3.13.5-202.fc20.x86_64-advanced-6a9a800c-309b-4b69-b269-884ad495e7b9' { 
       set gfxpayload=text 
       insmod gzio 
       insmod part_msdos 
       insmod ext2 
       set root='hd0,msdos1' 
       if [ x$feature_platform_search_hint = xy ]; then 
         search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1
--hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 --hint='hd0,msdos
1'  6d5929d8-fd35-49e6-a8bf-aab5309dad77 
       else 
         search --no-floppy --fs-uuid --set=root
6d5929d8-fd35-49e6-a8bf-aab5309dad77 
       fi 
       linux   /vmlinuz-3.19.2-201.fc21.x86_64
root=UUID=6a9a800c-309b-4b69-b269-884ad495e7b9 ro
vconsole.font=latarcyrheb-sun16  rhgb quiet 
nouveau.modeset=0 rd.driver.blacklist=nouveau video=vesa:off
LANG=en_GB.UTF-8 
       initrd /initramfs-3.19.2-201.fc21.x86_64.img 
}