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[SOLVED] Device /dev/disk/..... does not exist
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f222
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PostPosted: Sat Jul 15, 2017 8:58 am    Post subject: [SOLVED] Device /dev/disk/..... does not exist Reply with quote

Hi,

I had a working gentoo install with UEFI + systemd + encrypted disk.

Yesterday I modified the kernel so I could use docker and when I reboot my computer I just got a message :

"device /dev/disk/by-uuid/....... doesn't exist or access denied". I get into shell mode and the folder /dev/disk did not exists, and the command blkid doesn't show anything.

I boot on the gentoo install key, unencrypted my disk, chroot the sytem and modified the kernel to an older version and it didn't work either. I did this again to rebuild the initramfs and to update grub but nothing worked.

If anyone has an idea of what to do it would be great.

Thank you by advance


Last edited by f222 on Thu Jul 20, 2017 8:11 pm; edited 1 time in total
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eccerr0r
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PostPosted: Mon Jul 17, 2017 8:00 am    Post subject: Reply with quote

How far in the boot are you getting?

Udev creates /dev/disk/*

If you're dying in initramfs, which initramfs are you using? On my personal initramfs, it uses mdev which I don't recall if it creates the /dev/disk/* links...

Is /dev/ populated ? Does /dev even exist?

Ensure you're running the kernel you think you're running using uname, perhaps the kernel you're using is missing devtmpfs or something?
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f222
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PostPosted: Mon Jul 17, 2017 9:59 pm    Post subject: Reply with quote

To be honest with you i'm new to gentoo (I was on archlinux before) and I don't really know how far I go, I see the message 'loading initial ramdisk' an then loading LVM groups, (with a warning failed to connect to lvmetad which I have from the beginning). if I keep pressing enter to force him to stop I got a kernel panic.
I just know that i am in busybox

/dev exists and is populated by loop, ram, tty....

I made my kernel and my initramfs using genkrnel-nex using the following command lines :

genkernel --luks --lvm --busybox --keymap --menuconfig kernel

genkernel --install --udev --lvm --noramdisk-modules initramfs
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eccerr0r
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PostPosted: Mon Jul 17, 2017 10:56 pm    Post subject: Reply with quote

It sounds like you're still in initramfs (when you ls in that shell, is it your normal hard disk or seemingly something else? if it seems like something else, it's probably in initramfs. Also if it didn't say it's starting openrc then that's more evidence.) And it sounds like it's the gentoo genkernel initramfs (which unfortunately I know very little about.)

Do you recall anywhere that you specified /dev/disk/by-uuid/.... or was it something that the initramfs generated?

Are you using root=/dev/disk/by-uuid/.... for your boot loader? (This sort of doesn't work...) Then again, it shouldn't have suddenly stopped working.

Also make sure that you're using the correct initramfs for your kernel...

Have a picture of the failure screen somewhere?
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NeddySeagoon
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PostPosted: Tue Jul 18, 2017 8:08 am    Post subject: Reply with quote

f222,

The initrd loads because "loading LVM groups" comes from LVM which is a user space tool loaded from the initrd.
The text of the panic message would be really useful. Just the Unable to mount root .... part, if thats what it is.

/dev/disk/.. and friends are created by udev and are not normally used for finding the root device.
Please pastebin your /boot/grub/grub.cfg

If the problem happens after root is mounted, using /dev/disk/.. in /etc/fstab is not longer encouraged.
Did you miss the news item 2016-11-04 Important fstab and localmount update ?

Its not clear yet what the panic is about. I assume that its mounting root but there are other causes too.
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f222
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PostPosted: Tue Jul 18, 2017 9:44 pm    Post subject: Reply with quote

Thank you for your answers.

Here is what you asked, the grub.cfg

I did not enter/dev/disk/... anywhere, I use the CRYPT_ROOT=UUID=... option in grub

here is the precise error message : https://image.noelshack.com/minis/2017/29/2/1500414148-img-20170718-233434.png

Thank you for your help

PS is there a way to cleanly redo all my kernel using genkernel (for example wipe everything I have done in config )
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Zucca
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PostPosted: Tue Jul 18, 2017 10:09 pm    Post subject: Reply with quote

f222 wrote:
here is the precise error message : https://image.noelshack.com/minis/2017/29/2/1500414148-img-20170718-233434.png
To me it looks like you've forgotten to build required modules and those aren't on initrd --> boot fails.

I'd propably build all the filesystem, crypto and lvm/raid stuff in-kernel to avoid this.

Oh. And welcome to Gentoo. \o

EDIT:
f222 wrote:
genkernel --install --udev --lvm --noramdisk-modules initramfs
There's your error propably.
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f222
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PostPosted: Wed Jul 19, 2017 8:12 pm    Post subject: Reply with quote

I might have made some advancement.
I took the default genkernel configuration and follow the wiki about systemd, xorg, laptop-mode, docker... to setup the kernel. And now the error message is not the same, I got an error telling me "/sbin/cryptsetup not found in initramfs"
Here is a screenshot of it : https://image.noelshack.com/minis/2017/29/3/1500495016-img-20170719-220137.png

This might be related to what @Zucca said but I can't find how to have cryptsetup inside initramfs.

I will continue to search and tell you I there is any update
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NeddySeagoon
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PostPosted: Wed Jul 19, 2017 10:40 pm    Post subject: Reply with quote

f222,

There are several things missing there. The most telling line is
Code:
!! Could not find the root block device in .

This tells that the kernel cannot see your hard drives at all.
Between the word 'in' and the period, the kernel listed all the block devices it can see.

I suspect that this is related to
Code:
>> Skipping module load;no modules in the ramdisk!


Everything needed to boot must be configured in the kernel as <*>.
<M> can only work if the modules are included in the initrd.
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f222
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PostPosted: Thu Jul 20, 2017 8:10 pm    Post subject: Reply with quote

I finally found and understood all my mistakes. I am just a freaking idiot :oops:

The first problem I had was because I accidentally disabled something needed by dm-crypt.

with this thing disabled my computer didn't boot and I thought that maybe it could be caused by initramfs which had not been recompiled after the kernel, so I decided to recompile it and this is where I made my second mistake : I didn't send the good params to initramfs, id did :
Code:
genkernel --install --udev --lvm --noramdisk-modules initramfs
instead of
Code:
genkernel --install --udev --lvm --luks initramfs
(I used --noramdisk-modules which will prevent the computer from booting and forget to use --luks which is needed to have cryptsetup)

Thank you a lot for the time you took to help me.

I want to apologize for annoying you for such a stupid thing

Thank you again
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NeddySeagoon
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PostPosted: Thu Jul 20, 2017 8:25 pm    Post subject: Reply with quote

f222,

You have learned from your errors. That's experience.
Its only stupid if you don't learn ... but my excuse is it must have been a 'senior moment' :)

You have also helped others but you may not realise it.
Others will find this thread in future and you posted a solution.

No apology is required.
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