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Bug#1059518: initramfs-tools-core: mkinitramfs with `MODULES=most` doesn't correctly identify dependent modules, caused BIOS-installed system to fail booting on btrfs rootfs with xxhash checksum

Cross-posted to 2 groups.

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Package: initramfs-tools-core
Version: 0.142
Severity: important

mkinitramfs fails to detect that kernel module `xxhash_generic` should be
installed to init ramdisk, when the rootfs is on a btrfs filesystem with
checksum algorithm xxhash, and the disk partition table is msdos. This resulted
in the system being unbootable because the init ramdisk lacks kernel xxhash
support:

BTRFS info (device sda2): first mount of filesystem fs-uuid
BTRFS error (device sda2): error allocating xxhash64 hash for checksum
BTRFS error (device sda2): open_ctree failed
mount: mounting /dev/sda2 on /root failed: No such file or directory
Failed to mount /dev/sda2 as root filesystem.

Busybox v1.35.0 (Debian 1:1.35.0-4+b3) built-in shell (ash)
(Omitted)

After I added `xxhash_generic` to `/etc/initramfs-tools/modules` and
regenerated the init ramdisk the system booted without issue.

UEFI-installed system is unaffected (in fact I have been using btrfs rootfs
with xxhash as checksum alg on UEFI-only machines for almost a year so this
came as a big surprise when I found that it doesn't even boot), probably due to
xxhash module being marked as a dependency of another thing?

I would also like to propose that we add a (debug) option to include all
available kernel modules in init ramdisk, which may help debug issues like this
in the future.


For the debugging process I went through see:
https://paste.debian.net/1302284/
if anyone is interested.


-- System Information:
Debian Release: 12.4
  APT prefers stable-security
  APT policy: (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.1.0-15-amd64 (SMP w/4 CPU threads; PREEMPT)
Kernel taint flags: TAINT_FIRMWARE_WORKAROUND
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages initramfs-tools-core depends on:
ii  coreutils    9.1-1
ii  cpio         2.13+dfsg-7.1
ii  e2fsprogs    1.47.0-2
ii  klibc-utils  2.0.12-1
ii  kmod         30+20221128-1
ii  logsave      1.47.0-2
ii  udev         252.19-1~deb12u1

Versions of packages initramfs-tools-core recommends:
ii  busybox-static [busybox]  1:1.35.0-4+b3
ii  zstd                      1.5.4+dfsg2-5

Versions of packages initramfs-tools-core suggests:
pn  bash-completion  <none>

-- no debconf information

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Bug#1059518: initramfs-tools-core: mkinitramfs with `MODULES=most` doesn't correctly identify dependent modules, caused BIOS-installed system to fail booting on btrfs rootfs with xxhash checksum hastalavista_debian@murena.io - 2023-12-27 13:50 +0100
  Bug#1059518: initramfs-tools-core: mkinitramfs with `MODULES=most` doesn't correctly identify dependent modules, caused BIOS-installed system to fail booting on btrfs rootfs with xxhash checksum Ben Hutchings <ben@decadent.org.uk> - 2025-03-02 16:30 +0100
  Processed: Re: initramfs-tools-core: mkinitramfs with  `MODULES=most` doesn't correctly identify dependent modules, caused  BIOS-installed system to fail booting on btrfs rootfs with xxhash checksum "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-03-02 16:30 +0100

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