Error invalid magic number error you need to load the kernel first

I’m in trouble with new kernel compile.

I’m using kernel 5.4.48-gentoo-x86_64 and all working fine.

Using the same configuration (I have copied .config of the older kernel in new source directory and run «make syncconf») I have compiled today the new source 5.4.60.

Compile phase finish without any error (I used «genkernel —xconfig —clean all»), in boot directory I find the new initamfs and vmlinuz files.

When I restart the system, If in grub I select the new kernel the system halted with message

error: invalid magic number

error: initramfs, load kernel before

I read another post about a similar problem (https://forums.gentoo.org/viewtopic-t-1084672-highlight-invalid+magic+number.html), but I have not understand the solution.

Any suggestion?

Last edited by alessio_demarchi on Tue Sep 01, 2020 8:58 am; edited 1 time in total

old (previous compiled kernel files)

default (actual functioning kernel)

test (new kernel)

in each directory there is:

vmlinuz-genkernel-x86_64-<version>

initramfs-genkernel-x86_64-<version>

Systemmap-genkernel-<version>.map

kernel-config-<version>

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)

I used transfer.sh

The link is

https://transfer.sh/%28/Q385Q/genkernel.log%29.tar.gz

thanks

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…

Last edited by alessio_demarchi on Mon Aug 31, 2020 6:51 pm; edited 1 time in total

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

permission problem….

Try this

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

### BEGIN /etc/grub.d/00_header ###

if [ -s $prefix/grubenv ]; then

load_env

fi

if [ «${next_entry}» ] ; then

set default=»${next_entry}»

set next_entry=

save_env next_entry

set boot_once=true

else

set default=»${saved_entry}»

fi

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 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

}

}

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

### 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 ${root} hidden-

drivemap -s (hd0) ${root}

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 ${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 ###

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-<version>.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

Last edited by alessio_demarchi on Tue Sep 01, 2020 8:44 am; edited 1 time in total

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