[Bug 2056646] [NEW] Ubuntu dual boot mix up from zfs and from ext4

[BertN45]

Public bug reported:

I dual boot Ubuntu 23.10 from openzfs from nvme (main OS) and from ext4
from HDD (backup OS). In 23.10 everything worked, I could use my
datapools on both systems also rpool, The nvme datapool rpool contains
the ROOT dataset and 2 datasets with my main VMs.

I upgraded the ext4 system to 24.04 (do-release-upgrade -d) and that
worked fine. I have 2 other datapools on the HDD and I can use them
without any issue after (zpool import -f) on the ext4 system.

As soon as I try to import the datapool rpool the problem starts, it
gives the following error message:

"Broadcast message from systemd-journald at Host-sdb5 (Sat 2024-03-09
12:50:47 AST): systemd[1]: Caught <ABRT>, from our own process."

Afterwards it is impossible to use the terminal, it just does not start.
However most other applications still work as normal. It is also
impossible to shut-down the system from the menu.  I have to power off
the system with the power button.

On reboot I get the following error messages;

zfs: module license "CDDL" taints kernel.
Disabling lock debugging due to kernel taint
zfs: module license taints kernel

It seems to load the zfs kernel modules again, why? It is superfluous
and wrong, because they are already loaded from ext4 much earlier.
Afterward the system is completely confused and hangs. (see the annexed
photo)

My nvme system does not boot anymore, because it is missing rpool, but
it nicely advises in initramfs to use "zpool import -f" and that works.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: ubuntu-release-upgrader-core 1:24.04.7
ProcVersionSignature: Ubuntu 6.8.0-11.11-generic 6.8.0-rc4
Uname: Linux 6.8.0-11-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.28.0-0ubuntu1
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sat Mar  9 13:12:08 2024
InstallationDate: Installed on 2023-12-21 (80 days ago)
InstallationMedia: Ubuntu 23.10.1 "Mantic Minotaur" - Release amd64 (20231016.1)
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: Upgraded to noble on 2024-03-09 (0 days ago)
VarLogDistupgradeXorgFixuplog:
 INFO:root:/usr/bin/do-release-upgrade running
 INFO:root:No xorg.conf, exiting

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade noble wayland-session

** Attachment added: "20240309_120126.jpg"
   https://bugs.launchpad.net/bugs/2056646/+attachment/5754353/+files/20240309_120126.jpg

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https://bugs.launchpad.net/bugs/2056646

Title:
  Ubuntu dual boot mix up from zfs and from ext4

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  I dual boot Ubuntu 23.10 from openzfs from nvme (main OS) and from
  ext4 from HDD (backup OS). In 23.10 everything worked, I could use my
  datapools on both systems also rpool, The nvme datapool rpool contains
  the ROOT dataset and 2 datasets with my main VMs.

  I upgraded the ext4 system to 24.04 (do-release-upgrade -d) and that
  worked fine. I have 2 other datapools on the HDD and I can use them
  without any issue after (zpool import -f) on the ext4 system.

  As soon as I try to import the datapool rpool the problem starts, it
  gives the following error message:

  "Broadcast message from systemd-journald at Host-sdb5 (Sat 2024-03-09
  12:50:47 AST): systemd[1]: Caught <ABRT>, from our own process."

  Afterwards it is impossible to use the terminal, it just does not
  start. However most other applications still work as normal. It is
  also impossible to shut-down the system from the menu.  I have to
  power off the system with the power button.

  On reboot I get the following error messages;

  zfs: module license "CDDL" taints kernel.
  Disabling lock debugging due to kernel taint
  zfs: module license taints kernel

  It seems to load the zfs kernel modules again, why? It is superfluous
  and wrong, because they are already loaded from ext4 much earlier.
  Afterward the system is completely confused and hangs. (see the
  annexed photo)

  My nvme system does not boot anymore, because it is missing rpool, but
  it nicely advises in initramfs to use "zpool import -f" and that
  works.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: ubuntu-release-upgrader-core 1:24.04.7
  ProcVersionSignature: Ubuntu 6.8.0-11.11-generic 6.8.0-rc4
  Uname: Linux 6.8.0-11-generic x86_64
  NonfreeKernelModules: zfs
  ApportVersion: 2.28.0-0ubuntu1
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Mar  9 13:12:08 2024
  InstallationDate: Installed on 2023-12-21 (80 days ago)
  InstallationMedia: Ubuntu 23.10.1 "Mantic Minotaur" - Release amd64 (20231016.1)
  PackageArchitecture: all
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: Upgraded to noble on 2024-03-09 (0 days ago)
  VarLogDistupgradeXorgFixuplog:
   INFO:root:/usr/bin/do-release-upgrade running
   INFO:root:No xorg.conf, exiting

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