Custom kernel error: kernel module not found "xts" "/gnu/store/...-linux-custom-4.14.69/lib/modules"

Custom kernel error: kernel module not found "xts" "/gnu/store/...-linux-custom-4.14.69/lib/modules"

[Pierre Neidhardt]

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Hi Guix!

I'm working on a building a custom kernel for my laptop.

I've used the instructions given by Ludo in an older mail:

	https://lists.gnu.org/archive/html/help-guix/2016-07/msg00166.html

So far so good.

I've generated a .config with Linux' `make menuconfig`.  My experience
with menuconfig mostly dates back from my days on Gentoo, so I'm not
sure how much applies to GuixSD.

When building, I run into a sequence of errors:

--8<---------------cut here---------------start------------->8---
...
phase `compress-documentation' succeeded after 0.0 seconds
substitute: updating substitutes from 'https://mirror.hydra.gnu.org'... 100.0%
The following derivations will be built:
   /gnu/store/hjwj30a2g5q5msgavcf2hin2xm6i53bj-system.drv
   /gnu/store/rkbkwijai8bi053qysvd2grckkf97c06-grub.cfg.drv
   /gnu/store/wvahc3jc4v80jdilizsa13sv7biwi1gf-linux-modules.drv
   /gnu/store/02zbl4j4svycqp8csr0m1ixbbvcxwl9f-init.drv
   /gnu/store/k03h3ry4nrsv8phyphmxrqr5c69j9f7w-parameters.drv
   /gnu/store/vhqsgknpamjsl2c36a2z20snjqik5q2p-raw-initrd.drv
Backtrace:
          12 (primitive-load "/gnu/store/c9z5pkc2kv416wgjkqpjpp4lypr?")
In ice-9/eval.scm:
    619:8 11 (_ #f)
   626:19 10 (_ #<directory (guile-user) 7cc140>)
   293:34  9 (_ #(#<directory (guile-user) 7cc140> #<procedure loo?>))
In srfi/srfi-1.scm:
   592:29  8 (map1 _)
   592:29  7 (map1 _)
   592:29  6 (map1 ("uas" "usbhid" "hid-generic" "hid-apple" "dm-?" ?))
   592:29  5 (map1 ("usbhid" "hid-generic" "hid-apple" "dm-crypt" # ?))
   592:29  4 (map1 ("hid-generic" "hid-apple" "dm-crypt" "xts" "s?" ?))
   592:29  3 (map1 ("hid-apple" "dm-crypt" "xts" "serpent_generic" ?))
   592:29  2 (map1 ("dm-crypt" "xts" "serpent_generic" "wp512" "n?" ?))
   592:17  1 (map1 ("xts" "serpent_generic" "wp512" "nls_iso8859-1" ?))
In unknown file:
           0 (scm-error misc-error #f "~A ~S ~S" ("kernel module?" ?) ?)

ERROR: In procedure scm-error:
kernel module not found "xts" "/gnu/store/n1fvlgqq3cmfpy120y6ladw0k229y435-linux-custom-4.14.69/lib/modules"
...
--8<---------------cut here---------------end--------------->8---

Note that the build runs fine but install fails.  If I edit my .config
to include the missing module (here "xts") then the next rebuilt will
fail on the next missing module.

Including the module into the kernel ("y" instead of "m") does not work.

The list of module does not match the expectation I guess but I don't
know what Guix is trying to do here.

Insights?

--
Pierre Neidhardt
https://ambrevar.xyz/

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Re: Custom kernel error: kernel module not found "xts" "/gnu/store/...-linux-custom-4.14.69/lib/modules"

[Ludovic Courtès]

Hello Pierre,

Pierre Neidhardt <mail@ambrevar.xyz> skribis:

> The list of module does not match the expectation I guess but I don't
> know what Guix is trying to do here.

There’s a list of modules that must be present in the initrd, specified
by the ‘initrd-modules’ field.  By default that list is:

--8<---------------cut here---------------start------------->8---
scheme@(guile-user)> ,use(gnu system linux-initrd)
scheme@(guile-user)> %base-initrd-modules
$2 = ("ahci" "usb-storage" "uas" "usbhid" "hid-generic" "hid-apple" "dm-crypt" "xts" "serpent_generic" "wp512" "nls_iso8859-1" "pata_acpi" "pata_atiixp" "isci" "virtio_pci" "virtio_balloon" "virtio_blk" "virtio_net" "virtio_console" "virtio-rng")
--8<---------------cut here---------------end--------------->8---

Since your kernel lacks the “xts” module, you may have to do:

  (operating-system
    ;; …
    (initrd-modules (delete "xts" %base-initrd-modules)))

HTH!

Ludo’.

Re: Custom kernel error: kernel module not found "xts" "/gnu/store/...-linux-custom-4.14.69/lib/modules"

[Pierre Neidhardt]

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Fantastic, thank you so much for this!

The "linux-initrd.scm" file is very insightful.

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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