Grub error invalid magic number

old (previous compiled kernel files)
default (actual functioning kernel)
test (new kernel)

in each directory there is:
vmlinuz-genkernel-x86_64-
initramfs-genkernel-x86_64-
Systemmap-genkernel- .map
kernel-config-

in /boot directory I create two group of symbolik link:
initramfs-x86_64-1_old -> linked to initramfs in old directory
initramfs-x86_64-2_tst -> linked to initramfs in test directory
initramfs-x86_64-3_dfl -> linked to initramfs in default directory

kernel-x86_64-1_old, 2_tst, 3_dfl with the same philosophy as the previous tree link

System.map linked to default directory System.map

My system is my working laptop, and is running since 4 years ago with gentoo (dell precision M4800)

Thanks a lot for your replies

Get a debug shell in genkernel and run «gksosreport» and show us that file.
_________________
Regards,
Whissi

How can I show you genkernel.log (it is very huge)

thanks

This is wrong. Please read how genkernel determines kernel.config it will use. If you start building a new KV (=when upgrading kernel sources), pay attention to used kernel config. I recommend to always pass kernel config via parameter (—kernel-confog=/path/to/desired/kernel.config). This way you can be sure that nothing unexpected will happen (hint: If new kernel should be based on current running kernel, just use —kernel-config=/proc/config.gz).

If you really did what you wrote in your first posting, i.e. installed new kernel sources, copied any existing kernel.config into that directory and run an arbitrary command in that directory. on next genkernel run, this kernel.config (=/usr/src/linux/.config) will be ignored by default and genkernel will look for kernel.config based on set heuristic (determining KV based on set kernel sources, looking in /etc/kernels/ for an already existing kernel.config for that version. when building a new KV for the first time, a kernel.config for this KV usually doesn’t exist yet so genkernel will fall back to its generic kernel.config).

So please notice that shown genkernel.log shows

which means that something had created a config in there. This doesn’t match your story. Please verify.

• Rebuild kernel and initramfs with «genkernel all» and ensure that your desired kernel.config was used for that run (—kernel-config=/proc/config.gz)
• If genkernel-4.1.2 initramfs will be still unable to boot, get a shell in that environment and run «gksosreport» — attach this file to this thread like you did with genkernel.log

_________________
Regards,
Whissi

The method I used for configuring new kernel from previous kernel version source is explained in Gentoo wiki for kernel update (probably my english is not so good, and my explaination is not correct).
Typically I using genkernel —xconfig —clean all and I always check basic kernel configuration before compilation phase, and it seems to be correct.

I think the problem is not in initramfs file, but in vmlinuz. How can I run gksosreport, it is not and application installed in my system.

Now I try to run genkernel —kernel-config=/proc/config.gz all and then I try to reboot my system.

I think the problem is in vmlinuz, initramfs is not loaded, so I can’t run gksosreport.

The message reported at boot is:

Loading Linux x86_64-3_dfl .
error: invalid magic number
Loading initial ramdisk .
error: you need to load the kernel first.

Press any key to continue.

Последний раз редактировалось: alessio_demarchi (пн авг 31, 2020 6:51 pm), всего редактировалось 1 раз

this is my grub.cfg https://transfer.sh/%28%29.tar.gz

Try this
https://transfer.sh/%28%29.tar.gz

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
load_env
fi
if [ «$» ] ; then
set default=»$»
set next_entry=
save_env next_entry
set boot_once=true
else
set default=»$»
fi

if [ x»$» = xy ]; then
menuentry_id_option=»—id»
else
menuentry_id_option=»»
fi

if [ «$» ]; then
set saved_entry=»$»
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi

function savedefault <
if [ -z «$» ]; then
saved_entry=»$»
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$feature_default_font_path = xy ] ; then
font=unicode
else
insmod part_msdos
insmod jfs
set root=’hd0,msdos7′
if [ x$feature_platform_search_hint = xy ]; then
search —no-floppy —fs-uuid —set=root —hint-bios=hd0,msdos7 —hint-efi=hd0,msdos7 —hint-baremetal=ahci0,msdos7 3e5f2da8-79d5-4cff-99cc-5fcc68cfa006
else
search —no-floppy —fs-uuid —set=root 3e5f2da8-79d5-4cff-99cc-5fcc68cfa006
fi
font=»/usr/share/grub/unicode.pf2″
fi

if loadfont $font ; then
set gfxmode=1920×1080,1440×900,1280×800,1024×600,auto
load_video
insmod gfxterm
set locale_dir=$prefix/locale
set lang=en_US
insmod gettext
fi
terminal_output gfxterm
insmod part_msdos
insmod ext2
set root=’hd0,msdos6′
if [ x$feature_platform_search_hint = xy ]; then
search —no-floppy —fs-uuid —set=root —hint-bios=hd0,msdos6 —hint-efi=hd0,msdos6 —hint-baremetal=ahci0,msdos6 48f55fb2-f9e9-404c-9916-8a1c09ab9030
else
search —no-floppy —fs-uuid —set=root 48f55fb2-f9e9-404c-9916-8a1c09ab9030
fi
insmod png
background_image -m stretch /grub/mybackground.png
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=menu
set timeout=3
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
set timeout=3
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
menuentry ‘Gentoo GNU/Linux’ —class gentoo —class gnu-linux —class gnu —class os $menuentry_id_option ‘gnulinux-simple-3e5f2da8-79d5-4cff-99cc-5fcc68cfa006’ <
savedefault
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod ext2
set root=’hd0,msdos6′
if [ x$feature_platform_search_hint = xy ]; then
search —no-floppy —fs-uuid —set=root —hint-bios=hd0,msdos6 —hint-efi=hd0,msdos6 —hint-baremetal=ahci0,msdos6 48f55fb2-f9e9-404c-9916-8a1c09ab9030
else
search —no-floppy —fs-uuid —set=root 48f55fb2-f9e9-404c-9916-8a1c09ab9030
fi
echo ‘Loading Linux x86_64-3_dfl . ‘
linux /kernel-genkernel-x86_64-3_dfl root=UUID=3e5f2da8-79d5-4cff-99cc-5fcc68cfa006 ro resume=/dev/sda5 quiet splash
echo ‘Loading initial ramdisk . ‘
initrd /initramfs-genkernel-x86_64-3_dfl
>
submenu ‘Advanced options for Gentoo GNU/Linux’ $menuentry_id_option ‘gnulinux-advanced-3e5f2da8-79d5-4cff-99cc-5fcc68cfa006’ <
menuentry ‘Gentoo GNU/Linux, with Linux x86_64-3_dfl’ —class gentoo —class gnu-linux —class gnu —class os $menuentry_id_option ‘gnulinux-x86_64-3_dfl-advanced-3e5f2da8-79d5-4cff-99cc-5fcc68cfa006’ <
savedefault
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod ext2
set root=’hd0,msdos6′
if [ x$feature_platform_search_hint = xy ]; then
search —no-floppy —fs-uuid —set=root —hint-bios=hd0,msdos6 —hint-efi=hd0,msdos6 —hint-baremetal=ahci0,msdos6 48f55fb2-f9e9-404c-9916-8a1c09ab9030
else
search —no-floppy —fs-uuid —set=root 48f55fb2-f9e9-404c-9916-8a1c09ab9030
fi
echo ‘Loading Linux x86_64-3_dfl . ‘
linux /kernel-genkernel-x86_64-3_dfl root=UUID=3e5f2da8-79d5-4cff-99cc-5fcc68cfa006 ro resume=/dev/sda5 quiet splash
echo ‘Loading initial ramdisk . ‘
initrd /initramfs-genkernel-x86_64-3_dfl
>
menuentry ‘Gentoo GNU/Linux, with Linux x86_64-3_dfl (recovery mode)’ —class gentoo —class gnu-linux —class gnu —class os $menuentry_id_option ‘gnulinux-x86_64-3_dfl-recovery-3e5f2da8-79d5-4cff-99cc-5fcc68cfa006’ <
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod ext2
set root=’hd0,msdos6′
if [ x$feature_platform_search_hint = xy ]; then
search —no-floppy —fs-uuid —set=root —hint-bios=hd0,msdos6 —hint-efi=hd0,msdos6 —hint-baremetal=ahci0,msdos6 48f55fb2-f9e9-404c-9916-8a1c09ab9030
else
search —no-floppy —fs-uuid —set=root 48f55fb2-f9e9-404c-9916-8a1c09ab9030
fi
echo ‘Loading Linux x86_64-3_dfl . ‘
linux /kernel-genkernel-x86_64-3_dfl root=UUID=3e5f2da8-79d5-4cff-99cc-5fcc68cfa006 ro single resume=/dev/sda5
echo ‘Loading initial ramdisk . ‘
initrd /initramfs-genkernel-x86_64-3_dfl
>
menuentry ‘Gentoo GNU/Linux, with Linux x86_64-2_tst’ —class gentoo —class gnu-linux —class gnu —class os $menuentry_id_option ‘gnulinux-x86_64-2_tst-advanced-3e5f2da8-79d5-4cff-99cc-5fcc68cfa006’ <
savedefault
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod ext2
set root=’hd0,msdos6′
if [ x$feature_platform_search_hint = xy ]; then
search —no-floppy —fs-uuid —set=root —hint-bios=hd0,msdos6 —hint-efi=hd0,msdos6 —hint-baremetal=ahci0,msdos6 48f55fb2-f9e9-404c-9916-8a1c09ab9030
else
search —no-floppy —fs-uuid —set=root 48f55fb2-f9e9-404c-9916-8a1c09ab9030
fi
echo ‘Loading Linux x86_64-2_tst . ‘
linux /kernel-genkernel-x86_64-2_tst root=UUID=3e5f2da8-79d5-4cff-99cc-5fcc68cfa006 ro resume=/dev/sda5 quiet splash
echo ‘Loading initial ramdisk . ‘
initrd /initramfs-genkernel-x86_64-2_tst
>
menuentry ‘Gentoo GNU/Linux, with Linux x86_64-2_tst (recovery mode)’ —class gentoo —class gnu-linux —class gnu —class os $menuentry_id_option ‘gnulinux-x86_64-2_tst-recovery-3e5f2da8-79d5-4cff-99cc-5fcc68cfa006’ <
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod ext2
set root=’hd0,msdos6′
if [ x$feature_platform_search_hint = xy ]; then
search —no-floppy —fs-uuid —set=root —hint-bios=hd0,msdos6 —hint-efi=hd0,msdos6 —hint-baremetal=ahci0,msdos6 48f55fb2-f9e9-404c-9916-8a1c09ab9030
else
search —no-floppy —fs-uuid —set=root 48f55fb2-f9e9-404c-9916-8a1c09ab9030
fi
echo ‘Loading Linux x86_64-2_tst . ‘
linux /kernel-genkernel-x86_64-2_tst root=UUID=3e5f2da8-79d5-4cff-99cc-5fcc68cfa006 ro single resume=/dev/sda5
echo ‘Loading initial ramdisk . ‘
initrd /initramfs-genkernel-x86_64-2_tst
>
menuentry ‘Gentoo GNU/Linux, with Linux x86_64-1_old’ —class gentoo —class gnu-linux —class gnu —class os $menuentry_id_option ‘gnulinux-x86_64-1_old-advanced-3e5f2da8-79d5-4cff-99cc-5fcc68cfa006’ <
savedefault
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod ext2
set root=’hd0,msdos6′
if [ x$feature_platform_search_hint = xy ]; then
search —no-floppy —fs-uuid —set=root —hint-bios=hd0,msdos6 —hint-efi=hd0,msdos6 —hint-baremetal=ahci0,msdos6 48f55fb2-f9e9-404c-9916-8a1c09ab9030
else
search —no-floppy —fs-uuid —set=root 48f55fb2-f9e9-404c-9916-8a1c09ab9030
fi
echo ‘Loading Linux x86_64-1_old . ‘
linux /kernel-genkernel-x86_64-1_old root=UUID=3e5f2da8-79d5-4cff-99cc-5fcc68cfa006 ro resume=/dev/sda5 quiet splash
echo ‘Loading initial ramdisk . ‘
initrd /initramfs-genkernel-x86_64-1_old
>
menuentry ‘Gentoo GNU/Linux, with Linux x86_64-1_old (recovery mode)’ —class gentoo —class gnu-linux —class gnu —class os $menuentry_id_option ‘gnulinux-x86_64-1_old-recovery-3e5f2da8-79d5-4cff-99cc-5fcc68cfa006’ <
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod ext2
set root=’hd0,msdos6′
if [ x$feature_platform_search_hint = xy ]; then
search —no-floppy —fs-uuid —set=root —hint-bios=hd0,msdos6 —hint-efi=hd0,msdos6 —hint-baremetal=ahci0,msdos6 48f55fb2-f9e9-404c-9916-8a1c09ab9030
else
search —no-floppy —fs-uuid —set=root 48f55fb2-f9e9-404c-9916-8a1c09ab9030
fi
echo ‘Loading Linux x86_64-1_old . ‘
linux /kernel-genkernel-x86_64-1_old root=UUID=3e5f2da8-79d5-4cff-99cc-5fcc68cfa006 ro single resume=/dev/sda5
echo ‘Loading initial ramdisk . ‘
initrd /initramfs-genkernel-x86_64-1_old
>
>

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

### BEGIN /etc/grub.d/30_os-prober ###
menuentry ‘Windows 10 (on /dev/sda2)’ —class windows —class os $menuentry_id_option ‘osprober-chain-AE52157E52154C89’ <
savedefault
insmod part_msdos
insmod ntfs
set root=’hd0,msdos2′
if [ x$feature_platform_search_hint = xy ]; then
search —no-floppy —fs-uuid —set=root —hint-bios=hd0,msdos2 —hint-efi=hd0,msdos2 —hint-baremetal=ahci0,msdos2 AE52157E52154C89
else
search —no-floppy —fs-uuid —set=root AE52157E52154C89
fi
parttool $ hidden-
drivemap -s (hd0) $
chainloader +1
>
### 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.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f $/custom.cfg ]; then
source $/custom.cfg
elif [ -z «$» -a -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###

These are custom names.

The shown genkernel.log also shows that you created

Your shown grub.cfg doesn’t use that name schema.

I would suggest cleaning up /boot and re-run

. Please double check before reboot that grub.cfg will contain an entry using initramfs-5.4.60-gentoo-x86_64.img and corresponding kernel.
_________________
Regards,
Whissi

In my first post I used a simplified sintax. The filenames are correct in grub.cfg.
I tried command that you suggest before opening this post

The filename that compare in grub.cfg are symbolik link to initramfs-genkernel- .img and corresponding kernel file
I don’t know if it is usefull, this is my actual /boot directory:

drwxr-xr-x 2 root root 4096 Aug 31 21:15 default
drwxr-xr-x 6 root root 4096 Aug 29 13:05 grub
lrwxrwxrwx 1 root root 38 Aug 28 19:15 initramfs-genkernel-x86_64-1_old -> old/initramfs-5.4.48-gentoo-x86_64.img
lrwxrwxrwx 1 root root 39 Jul 17 11:22 initramfs-genkernel-x86_64-2_tst -> test/initramfs-5.4.48-gentoo-x86_64.img
lrwxrwxrwx 1 root root 42 Aug 28 19:43 initramfs-genkernel-x86_64-3_dfl -> default/initramfs-5.4.60-gentoo-x86_64.img
lrwxrwxrwx 1 root root 32 Aug 28 19:15 kernel-genkernel-x86_64-1_old -> old/vmlinuz-5.4.48-gentoo-x86_64
lrwxrwxrwx 1 root root 33 Jul 17 11:22 kernel-genkernel-x86_64-2_tst -> test/vmlinuz-5.4.48-gentoo-x86_64
lrwxrwxrwx 1 root root 42 Aug 28 19:43 kernel-genkernel-x86_64-3_dfl -> default/kernel-config-5.4.60-gentoo-x86_64
drwxr-xr-x 2 root root 4096 Aug 28 19:14 old
lrwxrwxrwx 1 root root 39 Aug 28 19:43 System.map -> default/System.map-5.4.60-gentoo-x86_64
drwxr-xr-x 2 root root 4096 Jul 17 11:23 test

All I can tell you:

If you manage to get genkernel’s initramfs loaded (you will see that on boot when initramfs will print you name and version) and it will fail, genkernel’s initramfs will offer you to enter rescue shell. If you enter rescue shell you can use «gksosreport» to get further help. If you don’t see such a prompt that is another indicator that you don’t use genkernel’s initramfs.

But at the moment it sounds like your problem is that you do not boot genkernel’s initramfs at all so this is not a genkernel problem.

So I recommend you to go back one step and follow handbook step by step. Build both, kernel and initramfs with genkernel (genkernell —kernel-config=/path/to/your/desired/kernel.config all) and tell bootloader to boot that image and initramfs. I am pretty sure that this will work when you use a working kernel config (for example /proc/config.gz from current running kernel).
_________________
Regards,
Whissi

Now I try to clear my /boot partition (all link and directory old, test and default), launch your suggested command (genkernel —kernel-config=/proc/config.gz all) then grub-mkconfig -o /boot/grub.cfg and then reboot my system.

wait a moment and then I write the result

Последний раз редактировалось: alessio_demarchi (вт сен 01, 2020 8:44 am), всего редактировалось 1 раз

Whissi thank a lot. For your patience and competence.

How can I mark as solved this topic?

Next to your first posting you should find an «EDIT» button which will allow you to change title to add «SOLVED» I think.
_________________
Regards,
Whissi