removing the non booting kernels how do I troubleshoot them?

Antonio Olivares wingators at inbox.com
Thu Oct 18 22:03:39 UTC 2012 

> By the way, cannot find /dev/root is almost certainly a bootloader
> problem - the kernel parameter line may have the wrong root= buried in
> it, so dracut isn't finding a rootfs to read or mount and thus it pukes
> after it's consumed everything it can in the initramfs.
> 

> --

Thank you sir!  and all that have helped/answered this thread.  The error is that the bootloader in this case calls /dev/root, while the older kernel calls 

root=UUID=11803751-9c77-4e25-96d8-daa772b53e5c

I changed the /dev/root in Grub Boot Loader interactively and the new kernel booted.  

[olivares at E-213-5W ~]$ uname -r
3.6.2-2.fc18.i686
[olivares at E-213-5W ~]$ uname -a
Linux E-213-5W 3.6.2-2.fc18.i686 #1 SMP Wed Oct 17 06:36:31 UTC 2012 i686 i686 i386 GNU/Linux


Now I have to change the line in grub via grub interactively and see that it fixes it and make a change somewhere so that subsequent kernel upgrades update correctly and not put '/dev/root' in there.

----------------------------------------------------

[root at E-213-5W grub2]# cat grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  load_env
fi
set default="0"

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

if [ x$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_msdos
insmod ext2
set root='hd0,msdos3'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos3 --hint-efi=hd0,msdos3 --hint-baremetal=ahci0,msdos3  11803751-9c77-4e25-96d8-daa772b53e5c
else
  search --no-floppy --fs-uuid --set=root 11803751-9c77-4e25-96d8-daa772b53e5c
fi
    font="/usr/share/grub/unicode.pf2"
fi

if loadfont $font ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=en_US
  insmod gettext
fi
terminal_output gfxterm
insmod part_msdos
insmod ext2
set root='hd0,msdos3'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos3 --hint-efi=hd0,msdos3 --hint-baremetal=ahci0,msdos3  11803751-9c77-4e25-96d8-daa772b53e5c
else
  search --no-floppy --fs-uuid --set=root 11803751-9c77-4e25-96d8-daa772b53e5c
fi
insmod gfxmenu
loadfont ($root)/boot/grub2/themes/system/DejaVuSans-10.pf2
loadfont ($root)/boot/grub2/themes/system/DejaVuSans-12.pf2
loadfont ($root)/boot/grub2/themes/system/DejaVuSans-Bold-14.pf2
insmod png
set theme=($root)/boot/grub2/themes/system/theme.txt
export theme
set timeout=5
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Fedora (3.6.2-2.fc18.i686)' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-11803751-9c77-4e25-96d8-daa772b53e5c' {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='hd0,msdos3'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos3 --hint-efi=hd0,msdos3 --hint-baremetal=ahci0,msdos3  11803751-9c77-4e25-96d8-daa772b53e5c
	else
	  search --no-floppy --fs-uuid --set=root 11803751-9c77-4e25-96d8-daa772b53e5c
	fi
	echo 'Loading Fedora (3.6.2-2.fc18.i686)'
	linux	/boot/vmlinuz-3.6.2-2.fc18.i686 root=/dev/root ro rd.md=0 rd.lvm=0 rd.dm=0 rd.luks=0 LANG=en_US.UTF-8 KEYTABLE=us
	echo 'Loading initial ramdisk ...'
	initrd /boot/initramfs-3.6.2-2.fc18.i686.img
}
menuentry 'Fedora' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-11803751-9c77-4e25-96d8-daa772b53e5c' {
	load_video
	set gfxpayload=keep
	insmod gzio
	insmod part_msdos
	insmod ext2
	set root='hd0,msdos3'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos3 --hint-efi=hd0,msdos3 --hint-baremetal=ahci0,msdos3  11803751-9c77-4e25-96d8-daa772b53e5c
	else
	  search --no-floppy --fs-uuid --set=root 11803751-9c77-4e25-96d8-daa772b53e5c
	fi
	echo	'Loading Linux 3.6.0-2.fc18.i686 ...'
	linux	/boot/vmlinuz-3.6.0-2.fc18.i686 root=UUID=11803751-9c77-4e25-96d8-daa772b53e5c ro rd.md=0 rd.lvm=0 rd.dm=0 rd.luks=0
	echo	'Loading initial ramdisk ...'
	initrd	/boot/initramfs-3.6.0-2.fc18.i686.img
}
submenu 'Advanced options for Fedora' $menuentry_id_option 'gnulinux-advanced-11803751-9c77-4e25-96d8-daa772b53e5c' {
	menuentry 'Fedora, with Linux 3.6.0-2.fc18.i686' --class fedora --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.6.0-2.fc18.i686-advanced-11803751-9c77-4e25-96d8-daa772b53e5c' {
		load_video
		set gfxpayload=keep
		insmod gzio
		insmod part_msdos
		insmod ext2
		set root='hd0,msdos3'
		if [ x$feature_platform_search_hint = xy ]; then
		  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos3 --hint-efi=hd0,msdos3 --hint-baremetal=ahci0,msdos3  11803751-9c77-4e25-96d8-daa772b53e5c
		else
		  search --no-floppy --fs-uuid --set=root 11803751-9c77-4e25-96d8-daa772b53e5c
		fi
		echo	'Loading Linux 3.6.0-2.fc18.i686 ...'
		linux	/boot/vmlinuz-3.6.0-2.fc18.i686 root=UUID=11803751-9c77-4e25-96d8-daa772b53e5c ro rd.md=0 rd.lvm=0 rd.dm=0 rd.luks=0
		echo	'Loading initial ramdisk ...'
		initrd	/boot/initramfs-3.6.0-2.fc18.i686.img
	}
}

### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_ppc_terminfo ###
### END /etc/grub.d/20_ppc_terminfo ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
menuentry 'FreeBSD 9.0' {
	insmod part_msdos
	set root='(hd0,msdos1)'
	chainloader +1
}

### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
[root at E-213-5W grub2]#

----------------------------------------------------

I am changing the /dev/root to the UUID mentioned above run
grub2-mkconfig -o /boot/grub2/grub.cfg
again and see if that cures the problem and subsequent problems with kernel updates.


Best Regards,


Antonio

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