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SubjectRe: Offtopic? - I have a vmlinuz-3.2.0-rc7+ kernel file that will not load -- ("invalid magic number") with the latest Ubuntu grub2 (1.99-14ubuntu2)
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On Mon, Dec 26, 2011 at 5:11 PM, Miles Lane <miles.lane@gmail.com> wrote:
> Sorry to ask a potentially off-topic question, but I have received no
> help from the GRUB2 mailing list.
> The reply I got was:
>      "Well apparently the number you gave it wasn't magic ;) just a
> joke. I really don't have a good answer , I wish I did. Sorry , I just
> needed to clown for a bit."
> http://comments.gmane.org/gmane.comp.boot-loaders.grub.user/974
>
> If noone has time to help, no problemo.  I suppose that when Canonical
> releases the final 12.04 that the problem will go away with a fresh
> install.
>
> I have a 3.2.0-6 kernel that Canonical built which successfully boots.
>  I have tried building a Linus GIT tree kernel using the .config that
> Canonical used, but it still fails to boot.
> My best guess is that perhaps there is either a problem with my Grub2
> (1.99-14ubuntu2) installation, or that something is amiss with my
> toolchain.
>
> I am running a WUBI install (the root filesystem is located in a
> loopback mounted file on my Windows 7 NTFS filesystem).   The
> distribution is Ubuntu 11.10 upgraded to 12.04 (Precise Pangolin).
>
>
> fdisk:
> Disk /dev/sda: 500.1 GB, 500107862016 bytes
> 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
> Units = sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x8ea8e911
>
>   Device Boot      Start         End      Blocks   Id  System
> /dev/sda1   *        2048      206847      102400    7  HPFS/NTFS/exFAT
> /dev/sda2          206848   976771071   488282112    7  HPFS/NTFS/exFAT
>
> mount:
> /dev/loop0 on / type ext3 (rw,commit=0,commit=0)
> proc on /proc type proc (rw,noexec,nosuid,nodev)
> sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
> none on /sys/fs/fuse/connections type fusectl (rw)
> none on /sys/kernel/debug type debugfs (rw)
> none on /sys/kernel/security type securityfs (rw)
> udev on /dev type devtmpfs (rw,mode=0755)
> devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
> tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
> none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
> none on /run/shm type tmpfs (rw,nosuid,nodev)
> /dev/sda2 on /host type fuseblk
> (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,blksize=4096)
> binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc
> (rw,noexec,nosuid,nodev)
> gvfs-fuse-daemon on /home/miles/.gvfs type fuse.gvfs-fuse-daemon
> (rw,nosuid,nodev,user=miles)
>
> /boot/grub/grub.cfg:
>
> ### BEGIN /etc/grub.d/00_header ###
> if [ -s $prefix/grubenv ]; then
>  set have_grubenv=true
>  load_env
> fi
> set default="0"
> if [ "${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="${chosen}"
>    save_env saved_entry
>  fi
> }
>
> function recordfail {
>  set recordfail=1
>  if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then
> save_env recordfail; fi; fi
> }
>
> function load_video {
>  insmod vbe
>  insmod vga
>  insmod video_bochs
>  insmod video_cirrus
> }
>
> insmod part_msdos
> insmod ntfs
> set root='(hd0,msdos2)'
> search --no-floppy --fs-uuid --set=root 9A200E69200E4CA7
> loopback loop0 /ubuntu/disks/root.disk
> set root=(loop0)
> if loadfont /usr/share/grub/unicode.pf2 ; then
>  set gfxmode=1680x1050x32
>  load_video
>  insmod gfxterm
>  insmod part_msdos
>  insmod ntfs
>  set root='(hd0,msdos2)'
>  search --no-floppy --fs-uuid --set=root 9A200E69200E4CA7
>  loopback loop0 /ubuntu/disks/root.disk
>  set root=(loop0)
>  set locale_dir=($root)/boot/grub/locale
>  set lang=en_US
>  insmod gettext
> fi
> terminal_output gfxterm
> if [ "${recordfail}" = 1 ]; then
>  set timeout=-1
> else
>  set timeout=10
> fi
> ### END /etc/grub.d/00_header ###
>
> ### BEGIN /etc/grub.d/05_debian_theme ###
> set menu_color_normal=white/black
> set menu_color_highlight=black/light-gray
> if background_color 44,0,30; then
>  clear
> fi
> ### END /etc/grub.d/05_debian_theme ###
>
> ### BEGIN /etc/grub.d/10_linux ###
> ### END /etc/grub.d/10_linux ###
>
> ### BEGIN /etc/grub.d/10_lupin ###
> if [ ${recordfail} != 1 ]; then
>  if [ -e ${prefix}/gfxblacklist.txt ]; then
>    if hwmatch ${prefix}/gfxblacklist.txt 3; then
>      if [ ${match} = 0 ]; then
>        set linux_gfx_mode=keep
>      else
>        set linux_gfx_mode=text
>      fi
>    else
>      set linux_gfx_mode=text
>    fi
>  else
>    set linux_gfx_mode=keep
>  fi
> else
>  set linux_gfx_mode=text
> fi
> export linux_gfx_mode
> if [ "$linux_gfx_mode" != "text" ]; then load_video; fi
> menuentry 'Ubuntu, with Linux 3.2.0-6-generic' --class ubuntu --class
> gnu-linux --class gnu --class os {
>        set gfxpayload=$linux_gfx_mode
>        insmod part_msdos
>        insmod ntfs
>        set root='(hd0,msdos2)'
>        search --no-floppy --fs-uuid --set=root 9A200E69200E4CA7
>        loopback loop0 /ubuntu/disks/root.disk
>        set root=(loop0)
>        linux   /boot/vmlinuz-3.2.0-6-generic root=UUID=9A200E69200E4CA7
> loop=/ubuntu/disks/root.disk ro   quiet splash vt.handoff=7
>        initrd  /boot/initrd.img-3.2.0-6-generic
> }
> submenu "Previous Linux versions" {
> menuentry 'Ubuntu, with Linux 3.2.0-rc7+' --class ubuntu --class
> gnu-linux --class gnu --class os {
>        set gfxpayload=$linux_gfx_mode
>        insmod part_msdos
>        insmod ntfs
>        set root='(hd0,msdos2)'
>        search --no-floppy --fs-uuid --set=root 9A200E69200E4CA7
>        loopback loop0 /ubuntu/disks/root.disk
>        set root=(loop0)
>        linux   /boot/vmlinuz-3.2.0-rc7+ root=UUID=9A200E69200E4CA7
> loop=/ubuntu/disks/root.disk ro   quiet splash vt.handoff=7
>        initrd  /boot/initrd.img-3.2.0-rc7+
> }
> ### BEGIN /etc/grub.d/41_custom ###
> if [ -f  $prefix/custom.cfg ]; then
>  source $prefix/custom.cfg;
> fi
> ### END /etc/grub.d/41_custom ###
>
> Gnu C                  4.6
> Gnu make               3.81
> binutils               2.22
> util-linux             2.20.1
> mount                  support
> module-init-tools      3.16
> e2fsprogs              1.42-WIP
> pcmciautils            018
> PPP                    2.4.5
> Linux C Library        2.13
> Dynamic linker (ldd)   2.13
> Procps                 3.2.8
> Net-tools              1.60
> Kbd                    1.15.2
> Sh-utils               8.13
> wireless-tools         30
>
> Modules Loaded:   parport_pc ppdev lp parport hid_logitech_dj joydev
> bnep rfcomm bluetooth snd_hda_codec_hdmi snd_hda_codec_realtek
> binfmt_misc usbhid hid uvcvideo videodev v4l2_compat_ioctl32
> snd_usb_audio snd_usbmidi_lib snd_hda_intel snd_hda_codec snd_hwdep
> snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer
> snd_seq_device i915 drm_kms_helper drm i2c_algo_bit video mei psmouse
> snd serio_raw soundcore snd_page_alloc shpchp e1000e
>
> My system board is an INTEL DH67BL, BIOS
> BLH6710H.86A.0110.2011.0415.1506 04/15/2011

I set debug=all at the Grub2 command line and tried to load my custom kernel.
The point where the failure occurs is when Grub checks to see whether
the root filesystem is ext2:

kern/disk.c:245: Opening 'loop0'.
kern/fs.c:54: Detecting tarfs...
failed
kern/fs.c:54: Detecting iso9660...
failed
kern/fs.c:54: Detecting ext2...
failed

Then I tried to load the Ubuntu vmlinuz-3.2.0-6-generic
And it gave:

kern/fs.c:54: Detecting ext2...
loader/i386/linux.c:201 real_size = 1800, prot_size = 4b1000, mmap_size = 2000

So, I am confused whether this problem is:
1. A failure of Grub2 resulting from some flaw that causes any
custom kernel installation to fail to boot because this detection
fails in Grub2.
2. A failure of Grub2 to successfully detect the loop mounted
filesystem at ext2 because there is a problem with a driver in Linus'
GIT tree.

Any thoughts on what the problem is?

Miles
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