Control: tag -1 moreinfo unreproducible On Sat, 2025-03-08 at 12:29 +0100, Eric Valette wrote: > On Fri, 7 Mar 2025 20:43:08 +0100 Marc Haber > <mh+debian-b...@zugschlus.de> wrote: > > On Fri, Mar 07, 2025 at 05:44:00PM +0100, Eric Valette wrote: > > > CONFIG_MODULE_DECOMPRESS=y > > So the culprit is there. It is not set in my own kernel build (never > been so far although config has been created via the official > linux-source-6.6) and thus I cannot load compressed modules without user > space helpers that probably not exist in initrd busybox version. Of > course I can load compressed modules once the pivot_root/switch_root is > done.
The initramfs is supposed to use modprobe etc. from kmod, not from
busybox. So there should be no difference in capabilities from the main
Debian system.
Does your initramfs image include the right version of modprobe?
Boot with "break=top" and run "modprobe --version" to check this.
[...]
> A second bug is that the initrd does not seems to be compressed while
> config says it should be with zstd (and the CONFIG_RD_* is ok). I can
> change to xz.
As explained, it is intentional that the modules are not recompressed,
while other files are. We made a trade-off between size and speed (of
mkinitramfs), and I don't intend to revisit that.
[...]
> Additional note : enabling this compilation flags, cause the signature
> of external modules to be incorrect as XZ with this flag *must* be used
> with CRC32 checksum and not the xz default CRC64. I had to add
> --check=crc32 to my signature scripts for external modules.
[...]
When does this signature script run?
I built a kernel from Linux 6.6.80 using the cloud-amd64 configuration
from linux-config-6.6, and an initramfs using initramfs-tools 0.146.
Module loading worked OK, so I don't believe this is a general problem.
Ben.
--
Ben Hutchings
Lowery's Law:
If it jams, force it. If it breaks, it needed replacing anyway.
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