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weatflac
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pietinger
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NeddySeagoon
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 Posted: Sun Jun 15, 2025 2:57 pm Post subject: |
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weatflac,
Welcome to Gentoo
Your panic message probably says unknown-block(x,y) where x and y are numbers.
What are the numbers?
The kernel will also show a list of block devices that it can see.
This may be an empty list, which is difficult to spot.
If you are supposed to be using an initrd, its not being used. If it were, you would be dropped to a shell, rather than seeing a panic.
You must rebuild the initrd with every kernel change as it normally contains kernel modules and the kernel and its modules are a matched set.
The kernel can tell.
That would not stop the initrd shell from working, if it was there.
pietinger has already asked lots of good questions so I won't repeat them.
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NeddySeagoon
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pietinger
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| Posted: Sun Jun 15, 2025 4:15 pm Post subject: |
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| NeddySeagoon wrote: | [...] Your panic message probably says unknown-block(x,y) where x and y are numbers.
What are the numbers? |
I could detect a (0,0) on the screen output, which means: No access to the device itself.
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NeddySeagoon
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| Posted: Sun Jun 15, 2025 4:25 pm Post subject: |
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pietinger,
Well caught. I missed that.
Its also attempting to mount root by fs UUID. That's not possible without an initrd.
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NeddySeagoon
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pietinger
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weatflac
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NeddySeagoon
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| Posted: Sun Jun 15, 2025 7:05 pm Post subject: |
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weatflac,
unknown-block(X,Y) indicates the (major,minor) numbers of the block device.
You can look them up in /usr/src/linux/Documentation/admin-guide/devices.txt Alos on the web.
fstab is located on the root filesystem which cannot be read yet as the root filesystem failed to mount.
We know nothing about it yet.
Maybe PC Boot Process will provide some background.
Your 6.12.31-gentoo-dist kernel requires a matching initramfs to be able to mount root.
You have that in /efi
Please learn to use wgetpaste. It allows helpers to copy/paste things back to you. It helps us to help you.
e.g. | Code: | wgetpaste -c 'emerge --info'
Your paste can be seen here: https://bpa.st/DGPQ |
You post the link. It's text on a web page, not an image.
My diagnosis at the moment, is that grub is not loading your iniramfs.
For that we need to see your grub.cfg, which should be at /efi/grub/grub.cfg
It's far to big for an image or a post. wgetpaste is your next Gentoo learning opportunity. :)
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NeddySeagoon
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weatflac
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NeddySeagoon
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| Posted: Sun Jun 15, 2025 8:28 pm Post subject: |
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weatflac,
First the good news ...
| grub.cfg: | search --no-floppy --fs-uuid --set=root f169cb28-42ca-46ce-a468-58dcd5e27a3e
echo 'Loading Linux 6.12.31-gentoo-dist ...'
linux /boot/vmlinuz-6.12.31-gentoo-dist root=UUID=f169cb28-42ca-46ce-a468-58dcd5e27a3e ro
echo 'Loading initial ramdisk ...'
initrd /boot/amd-uc.img /boot/initramfs-6.12.31-gentoo-dist.img |
| blkid: | | /dev/nvme0n1p3: UUID="f169cb28-42ca-46ce-a468-58dcd5e27a3e" BLOCK_SIZE="4096" TYPE="ext4" PARTUUID="2092621c-ed04-42d7-a68c-154a54d7654b" |
| /etc/fstab: | | PARTUUID=2092621c-ed04-42d7-a68c-154a54d7654b / ext4 defaults,noatime 0 1 |
That's all self consistent. Using the filesystem UUID is one place and PARTUUID in another is fine too.
One oddity is that grub is going to load the files it needs from | Code: | | -set=root f169cb28-42ca-46ce-a468-58dcd5e27a3e |
there is no kernel filesystem tree yet. So grub has to make its own arrangements to read what it needs.
Together that means it will read the kernel and initramfs from the /boot directory on your root filesystem.
You showed earlier that the files were in /efi. That's not what grub is going to read.
Get back into your chroot and post please.
You should have | Code: | | vmlinuz-6.12.31-gentoo-dist amd-uc.img initramfs-6.12.31-gentoo-dist.img |
there.
The timestamps matter too.
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NeddySeagoon
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pietinger
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weatflac
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NeddySeagoon
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| Posted: Mon Jun 16, 2025 9:48 am Post subject: |
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weatflac,
This looks good. The kernel and initramfs are a matched set.
| Code: | # ls -lR /boot
/boot:
total 42884
drwxr-xr-x 3 root root 4096 Jun 14 23:43 EFI
-rw-r--r-- 1 root root 11130822 May 30 01:11 System.map-6.12.31-gentoo-dist
-rw-r--r-- 1 root root 280066 Jun 14 19:16 config-6.12.31-gentoo-dist
drwxr-xr-x 6 root root 4096 Jun 15 09:03 grub
-rw------- 1 root root 11987511 Jun 14 19:17 initramfs-6.12.31-gentoo-dist.img
-rw-r--r-- 1 root root 20499440 Jun 14 19:16 vmlinuz-6.12.31-gentoo-dist |
but the kernel and initrd are older than the ones in you image, so they predate your kernel rebuild.
The file amd-uc.img is not required for booting. Its the CPU microcode file. Its good to have to keep your CPU up to date.
It's not built with the kernel so a kernel rebuild won't fix it. It may be built with the initramfs. I don't do it that way.
Wild thought ...
You have | Code: | echo 'Loading initial ramdisk ...'
initrd /boot/amd-uc.img /boot/initramfs-6.12.31-gentoo-dist.img |
in grub.cfy
with /boot/amd-uc.img listed first. Hold that thought.
When you boot, grub loads your kernel. We know that as it panics.
When it comes to the | Code: | | initrd /boot/amd-uc.img /boot/initramfs-6.12.31-gentoo-dist.img |
line, /boot/amd-uc.img is missing, so that fails.
I wonder if grub stops looking for other initramfs files at the point?
We know that that /boot/initramfs-6.12.31-gentoo-dist.img is not being used.
Here is a quick test. Boot into grub. Choose the boot entry you want - highlight it. Press 'e' for edit.
Follow the on screen instructions.
FInd the . | Code: | | initrd /boot/amd-uc.img /boot/initramfs-6.12.31-gentoo-dist.img |
line and remove
Allow the boot to proceed.
This has only edited the grub.cfg in RAM. There are no persistent changes.
Does it still panic?
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NeddySeagoon
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pietinger
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| Posted: Mon Jun 16, 2025 12:00 pm Post subject: |
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weatflac,
after testing what Neddy said, you can make a permanent solution (together with cleaning) ->
Okay, there was a mishmash in the past because of the mount from the ESP to /boot. I see that you have commented out everything in /etc/portage/package.use/uki - good! (You can delete it if you want). The other file: /etc/portage/package.use/installkernel can be changed to one line:
| Code: | | sys-kernel/installkernel dracut |
(Yes, leave out the use-flag "grub" for now; yes, your line USE="dist-kernel" in make.conf is correct and good; yes, I also have ACCEPT_LICENSE="* -@EULA" and therefore you dont need some additionally settings).
The whole thing can simply be cleaned up. Urgent request: If even a single command does not work, please stop immediately and do not try to continue. (Tell us then)
1. Boot with LiveCD
2. Chroot into your system .... and mount your ESP manually to /efi (as it is the default in our AMD64 Handbook)
3. Check if your /etc/fstab has /efi instead of /boot for mounting the ESP (as I already mentioned); also edit /etc/portage/package.use/installkernel (as mentioned above)
4. Delete old stuff from /efi and /boot ->
| Code: | rm -rf /efi/*
rm -rf /boot/* |
5. Re-emerge all what is missing now - maybe you want our binary distribution kernel?
| Code: | | emerge linux-firmware intel-microcode installkernel grub gentoo-kernel |
- OR -
| Code: | | emerge linux-firmware intel-microcode installkernel grub gentoo-kernel-bin |
6. Manage grub manually
| Code: | grub-install --efi-directory=/efi
grub-mkconfig -o /boot/grub/grub.cfg |
This time; later you can add the Use-flag "grub" to /etc/portage/package.use/installkernel
| Code: | | sys-kernel/installkernel dracut grub |
(yes, you can add more Use-flags in ONE line)
7. end it:
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weatflac
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| Posted: Mon Jun 16, 2025 12:06 pm Post subject: |
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The line amd-uc.img didn't exist. But good thing is I'm able to boot the system again, after selecting advanced options in grub and then choosing the distribution kernel. The default ones also working now, I don't know what parameter I tweaked that it started working suddenly, maybe /etc/fstab.
As I wanted to learn more and gentoo is helping me, it was a great experience with kernel panic. I will go through the gentoo wiki again and try to find the reason tho. Thankyou once again for helping me out and tbh has been my best experience so far in any forum.
The only thing I'm concerned is the warning message openrc is showing while starting up : some local filesystem failed to mount & it's/efi.
Thankyou |
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pietinger
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| Posted: Mon Jun 16, 2025 12:27 pm Post subject: |
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weatflac,
the additional reason I suggest to clean up (see my post 6 minutes before your post), is: We dont know which Use-flags have been activated when you did the last emerge of "installkernel" ... so it is possible you will get problems later if not re-emerged with only "dracut" (and none other).
| weatflac wrote: | | [...] Thankyou once again for helping me out and tbh has been my best experience so far in any forum. |
You are very Welcome! 
| weatflac wrote: | | [...] The only thing I'm concerned is the warning message openrc is showing while starting up : some local filesystem failed to mount & it's/efi. |
Maybe give us again the file /etc/fstab together with "blkid" ...
Have fun with Gentoo! 
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NeddySeagoon
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| Posted: Mon Jun 16, 2025 4:24 pm Post subject: |
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weatflac,
Enjoy your Gentoo.
Now on to your next Gentoo learning opportunity. :)
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Regards,
NeddySeagoon
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Kernel & Hardware
