Debian Bug report logs - #1050582
kmod does not work with XZ in-kernel module decompression

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: antonio <antdev66@gmail.com>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: kmod update corrupts systemd uefi boot

Date: Sat, 26 Aug 2023 16:59:15 +0200

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Package: kmod
Version: 30+20230519-1
Severity: normal
X-Debbugs-Cc: antdev66@gmail.com


Dear Maintainer,
updating "kmod" and "libkmod2:amd64" 30+20230519-1 -> 30+20230601-1 a series of
errors return during the boot process which is not completed.
I attach photo.
Thanks,
Antonio


-- System Information:
Debian Release: trixie/sid
  APT prefers unstable
  APT policy: (700, 'unstable'), (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable'), (100, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.4.12-1-liquorix-amd64 (SMP w/24 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE
Locale: LANG=it_IT.UTF-8, LC_CTYPE=it_IT.UTF-8 (charmap=UTF-8), LANGUAGE=it
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages kmod depends on:
ii  libc6     2.37-7
ii  libkmod2  30+20230519-1
ii  liblzma5  5.4.1-0.2
ii  libssl3   3.0.10-1
ii  libzstd1  1.5.5+dfsg2-1

kmod recommends no packages.

kmod suggests no packages.

-- no debconf information

[IMG20230826164930.jpg (image/jpeg, attachment)]

Message #16 received at 1050582@bugs.debian.org (full text, mbox, reply):

From: Marco d'Itri <md@Linux.IT>

To: antonio <antdev66@gmail.com>, 1050582@bugs.debian.org

Subject: Re: Bug#1050582: kmod update corrupts systemd uefi boot

Date: Sat, 26 Aug 2023 19:57:44 +0200

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On Aug 26, antonio <antdev66@gmail.com> wrote:

> Kernel: Linux 6.4.12-1-liquorix-amd64 (SMP w/24 CPU threads; PREEMPT)
I see that you are using a custom kernel. What is the status of the
CONFIG_MODULE_COMPRESS_* kernel configuration options?

-- 
ciao,
Marco

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Message #21 received at 1050582@bugs.debian.org (full text, mbox, reply):

From: Antonio <antdev66@gmail.com>

To: Marco d'Itri <md@Linux.IT>, 1050582@bugs.debian.org

Subject: Re: Bug#1050582: kmod update corrupts systemd uefi boot

Date: Sat, 26 Aug 2023 20:20:23 +0200

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Found this:

# CONFIG_MODULE_COMPRESS_NONE is not set
# CONFIG_MODULE_COMPRESS_GZIP is not set
CONFIG_MODULE_COMPRESS_XZ=y
# CONFIG_MODULE_COMPRESS_ZSTD is not set


Il 26/08/23 19:57, Marco d'Itri ha scritto:
> On Aug 26, antonio<antdev66@gmail.com>  wrote:
>
>> Kernel: Linux 6.4.12-1-liquorix-amd64 (SMP w/24 CPU threads; PREEMPT)
> I see that you are using a custom kernel. What is the status of the
> CONFIG_MODULE_COMPRESS_* kernel configuration options?
>

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Message #30 received at 1050582@bugs.debian.org (full text, mbox, reply):

From: Martin Nybo Andersen <tweek@tweek.dk>

To: 1050582@bugs.debian.org

Subject: Re: Bug#1050582: kmod update corrupts systemd uefi boot

Date: Fri, 15 Sep 2023 13:58:06 +0200 (CEST)

Hi,

The problem is, that kmod has switched to using the kernel decompressor 
when available, which is XZ Embedded. This version doesn't handle CRC64 
and dictionaries larger than 1 MiB.

You can fix it by compressing the modules with `xz --check=crc32 --lzma2=dict=1MiB module.ko`

This can easily be done by applying the following patch to your kernel git 
repository:

https://lore.kernel.org/all/3d34a965-ab9c-d549-0c63-c717ab5d2edc@tweek.dk/

Afterwards `make modules_install` will compress and install the modules 
correctly.


Best regards,
Martin Nybo Andersen

Message #35 received at 1050582-done@bugs.debian.org (full text, mbox, reply):

From: Marco d'Itri <md@Linux.IT>

To: Martin Nybo Andersen <tweek@tweek.dk>, 1050582-done@bugs.debian.org

Subject: Re: Bug#1050582: kmod update corrupts systemd uefi boot

Date: Sun, 24 Sep 2023 23:37:56 +0200

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On Sep 15, Martin Nybo Andersen <tweek@tweek.dk> wrote:

> The problem is, that kmod has switched to using the kernel decompressor when
> available, which is XZ Embedded. This version doesn't handle CRC64 and
> dictionaries larger than 1 MiB.
Thank you a lot for the detailed explanation.
Since this is not a kmod bug and Debian does not ship compressed modules 
I will close the bug.

-- 
ciao,
Marco

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