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Bug#1076099: debian-installer: LVM's activation broken for volumes with the dm-integrity feature

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  Bug#1076099: debian-installer: LVM's activation broken for volumes with the dm-integrity feature Cyril Brulebois <kibi@debian.org> - 2024-07-10 21:00 +0200

#82956 — Bug#1076099: debian-installer: LVM's activation broken for volumes with the dm-integrity feature

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Hi Franco,

Franco <martellif67@gmail.com> (2024-07-10):
> In a VirtualBox virtual machine I've converted a LVM volume with the following options:
> 
> ~# lvconvert --raidintegrity y --raidintegritymode bitmap ...
> 
> When I boot in rescue-mode that machine using the
> "debian-12.5.0-amd64-DVD-1.iso" iso, I follow all configuration steps
> until D-I asks me which device I want to mount as root filesystem (for
> running a shell into), then it happens that the volume is shown but if
> selected an error message it appears on the screen (red) that it says:
> 
> ---
> No such device
> The device you entered for your root file system (/dev/vg0/lv1) does not exist. Please try again
> ---
> 
> Then I choose to run a shell without mount a root filesystem and I try to manually activate the LVM's volume, but it fails with this error message:
> 
> ~# vgchange -a y vg0
> modprobe: FATAL: Module dm-integrity not found in directory /lib/modules/6.1.0-18-amd64
>   /sbin/modprobe failed: 1
>   Can't process LV vg0/lv1_rimage_0: integrity target support missing from kernel?
>   0 logical volume(s) in volume group "vg0" now active
> 
> The kernel version of D-I is:
> 
> ~# uname -a
> Linux bw12 6.1.0-18-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.76-1 (2024-02-01) x86_64 GNU/Linux
> 
> I suggest to add "dm-integrity" module to kernel image enabling the
> configuration entry CONFIG_DM_INTEGRITY=m and possibly add the
> "dm-integrity" module's name to /etc/initramfs-tools/modules file in
> order to automatically activate at boot time the LVM volumes with the
> integrity feature enabled.

The first bit has been here for a very long while (linux 4.17.3-1,
back in 2018), but we would need dm-integrity to be added to linux's
debian/installer/modules/md-modules for that to become available in
the installer.

Cc-ing the kernel team for the time being, I have no clue whether it
makes sense to have that included for everyone, or if that's solving
a corner case (as far as I understand it you enabled a feature that's
not turned on by default). {Making,Keeping} rescue mode {more,} useful
is a worthy goal but it's really not meant to compete with a dedicated
rescue-oriented image (or even general-purpose images like live ones).


Cheers,
-- 
Cyril Brulebois (kibi@debian.org)            <https://debamax.com/>
D-I release manager -- Release team member -- Freelance Consultant

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