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kos
n00b
Joined: 28 May 2003
Posts: 71
Location: Mountain View, CA
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 Posted: Sat Aug 15, 2020 1:24 am Post subject: [solved] no /dev/disk/by-uuid on boot |
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Hi
My system stopped propagating `/dev/disk/by-uuid` on boot, and so root volume can't be found. The only thing I see in the rescue shell is `/dev/disk/by-id`.
`by-uuid` gets created later, when udev starts I guess.
I'm building my kernel using `genkernel --disklabel all`
What am I missing?
thanks
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/KoS
Last edited by kos on Mon Aug 17, 2020 5:02 pm; edited 1 time in total |
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Whissi
Retired Dev
Joined: 12 Jan 2011
Posts: 222
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| Posted: Sat Aug 15, 2020 5:46 pm Post subject: |
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Which genkernel version are you using? Because you mentioned udev I assume genkernel-4.1.0?
Root will be detected after udev started so this shouldn't be a problem.
Check that only one root kernel command-line argument is present and that this value is correct. Also, please tell us the exact error you are facing.
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Whissi |
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kos
n00b
Joined: 28 May 2003
Posts: 71
Location: Mountain View, CA
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| Posted: Sat Aug 15, 2020 11:01 pm Post subject: |
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I'm using genkernel 4.0.10, latest stable. Should I unmask and try 4.1.0?
By some reason my current version tries to mount root before starting udev I think. Visually there's much fewer logging happening before it tries to mount root, compared to what I was getting when it was working fine.
/proc/cmdline:
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root=/dev/ram0 real_root=/dev/disk/by-uuid/e71d81da-0885-4f7b-a45e-77d4533df813 rootfstype=ext4 real_init=/sbin/init keymap=us root_trim=yes fbcon=font:TER16x32 mitigations=off crashkernel=512M nokaslr BOOT_IMAGE=/boot/vmlinuz-5.8.0-gentoo-r1-x86_64 root=/dev/nvme0n1p2 ro intel_iommu=igfx_off
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second `root=/dev/nvme0n1p2` got added because I specified it manually at boot after it fail to find `real_root`.
Will tell the exact error message after next reboot, but it was a standard message about not being able to find `/dev/disk/by-uuid/e71d81da-0885-4f7b-a45e-77d4533df813` with a prompt to specify the alternative or drop to rescue shell
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Whissi
Retired Dev
Joined: 12 Jan 2011
Posts: 222
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| Posted: Sun Aug 16, 2020 12:32 am Post subject: |
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4.1.0 was marked stable a few hours ago. Just wait, sync and test in a few hours.
| Quote: | | By some reason my current version tries to mount root before starting udev I think. |
This is confusing me. (E)UDEV is the new feature of genkernel-4.1.0 -- previous versions are using MDEV.
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Whissi |
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kos
n00b
Joined: 28 May 2003
Posts: 71
Location: Mountain View, CA
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| Posted: Mon Aug 17, 2020 5:02 pm Post subject: |
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re mdev vs udev -- I might be mixing them up, I don't know what genkernel is using internally.
But anyways, 4.1.0 solved the issue. Thanks!
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/KoS |
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