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
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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