[Bug 2052878] [NEW] No bootmenu items generated by grub-mkconfig on ZFS

[Vladimir S.]

Public bug reported:

Environment:
# lsb_release -rd
Description:	Ubuntu 22.04.3 LTS
Release:	22.04
# apt-cache policy grub2-common
grub2-common:
  Installed: 2.06-2ubuntu7.2
  Candidate: 2.06-2ubuntu7.2
  Version table:
 *** 2.06-2ubuntu7.2 500
        500 http://cz.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     2.06-2ubuntu7 500
        500 http://cz.archive.ubuntu.com/ubuntu jammy/main amd64 Packages

Observed behavior: Got unbootable system after kernel upgrade.

Expected behavior: Booting perfectly booting shiny new linux system. :-)

Symptoms:
Ubuntu 20.04 is installed on ZFS. Datasets on bpool (and rpool) use are being snapshot as part of recovery plan. Package upgrade triggered grub-mkconfig. There is always a lot of warnings. This time the generated grub.cfg contained no items to boot linux. The system was unbootable.

Steps to reproduce (and correction):

Run
# grub-mkconfig

observe stderr message "/etc/grub.d/10_linux_zfs: 905: GRUB_DISTRIBUTOR:
parameter not set"

and the output from /etc/grub.d/10_linux_zfs is empty in stdout.


Run
# GRUB_DISTRIBUTOR= GRUB_CMDLINE_LINUX_DEFAULT= GRUB_CMDLINE_LINUX= grub-mkconfig

the output contans linux boot items generated by
/etc/grub.d/10_linux_zfs

Comments and suggestions:
It seems that either the required parameters (environnment variables) are not set during apt-upgrade or 10_linux_zfs misbehaves when optional parameters in envvars are missing.
I can't decide.
Anyway, there is an availability problem after upgrade, so I am considering this as a security incident.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: grub2-common 2.06-2ubuntu7.2
ProcVersionSignature: Ubuntu 6.5.0-17.17~22.04.1-generic 6.5.8
Uname: Linux 6.5.0-17-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sun Feb 11 08:07:09 2024
InstallationDate: Installed on 2022-11-19 (448 days ago)
InstallationMedia: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809.1)
SourcePackage: grub2
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug jammy wayland-session

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https://bugs.launchpad.net/bugs/2052878

Title:
  No bootmenu items generated by grub-mkconfig on ZFS

Status in grub2 package in Ubuntu:
  New

Bug description:
  Environment:
  # lsb_release -rd
  Description:	Ubuntu 22.04.3 LTS
  Release:	22.04
  # apt-cache policy grub2-common
  grub2-common:
    Installed: 2.06-2ubuntu7.2
    Candidate: 2.06-2ubuntu7.2
    Version table:
   *** 2.06-2ubuntu7.2 500
          500 http://cz.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       2.06-2ubuntu7 500
          500 http://cz.archive.ubuntu.com/ubuntu jammy/main amd64 Packages

  Observed behavior: Got unbootable system after kernel upgrade.

  Expected behavior: Booting perfectly booting shiny new linux system.
  :-)

  Symptoms:
  Ubuntu 20.04 is installed on ZFS. Datasets on bpool (and rpool) use are being snapshot as part of recovery plan. Package upgrade triggered grub-mkconfig. There is always a lot of warnings. This time the generated grub.cfg contained no items to boot linux. The system was unbootable.

  Steps to reproduce (and correction):

  Run
  # grub-mkconfig

  observe stderr message "/etc/grub.d/10_linux_zfs: 905:
  GRUB_DISTRIBUTOR: parameter not set"

  and the output from /etc/grub.d/10_linux_zfs is empty in stdout.

  
  Run
  # GRUB_DISTRIBUTOR= GRUB_CMDLINE_LINUX_DEFAULT= GRUB_CMDLINE_LINUX= grub-mkconfig

  the output contans linux boot items generated by
  /etc/grub.d/10_linux_zfs

  Comments and suggestions:
  It seems that either the required parameters (environnment variables) are not set during apt-upgrade or 10_linux_zfs misbehaves when optional parameters in envvars are missing.
  I can't decide.
  Anyway, there is an availability problem after upgrade, so I am considering this as a security incident.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: grub2-common 2.06-2ubuntu7.2
  ProcVersionSignature: Ubuntu 6.5.0-17.17~22.04.1-generic 6.5.8
  Uname: Linux 6.5.0-17-generic x86_64
  NonfreeKernelModules: zfs
  ApportVersion: 2.20.11-0ubuntu82.5
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Feb 11 08:07:09 2024
  InstallationDate: Installed on 2022-11-19 (448 days ago)
  InstallationMedia: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809.1)
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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