[Bug 2051999] Re: Grub2 2.06 has upstream bug that results in Non-booting with ZFS after snapshot of bpool.

[Mate Kukri]

1. Doing 2.12 backports to Jammy will happen, but it's not an overnight
process. The delta from 2.06 to 2.12 is large, and even though it might
work on your and my machine. We are hoping that the 2.12 release to
Debian testing now, upload to Debian -backports later, and release to
Noble in April will give us more time to see the effect in the field.

Some minor breakage on old and odd machines will happen, I know that, as
we have changed the entire kernel loading mechanism going from 2.12 ->
2.06, but hopefully it can be kept as minimal as possible. I am already
in the process of integrating patches for issues reported in reaction to
the Debian testing roll-out.

2. The PPA breaking Jammy has an additional very different reason to not
doing 2.12 backports right now, it's because of the wrong build OS being
used, basically:

If you only install grub-efi-* from the PPA it's less likely to break,
but the problem is `grub*-common` is linked against user-space shlibs
from Noble which can and will be newer than Jammy's, and ABI backwards
compatibility isn't exactly always a guarantee.

The correct solution for Jammy would be to upload the same package with a slightly different version number and `jammy` as the series in d/changelog to a PPA, and then have
"deb [trusted=yes] https://ppa.launchpadcontent.net/your_user_here/ppa_here/ubuntu/ jammy main" in sources.


If you want a GRUB 2.12 build for Jammy right now, I can upload that to a PPA in my namespace.

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https://bugs.launchpad.net/bugs/2051999

Title:
  Grub2 2.06 has upstream bug that results in Non-booting with ZFS after
  snapshot of bpool.

Status in grub2 package in Ubuntu:
  Confirmed
Status in grub2-unsigned package in Ubuntu:
  Confirmed
Status in zfs-linux package in Ubuntu:
  New

Bug description:
  There is an upstream Bug with Grub where if you create snapshots of bpool, it results in a non-booting System. The problem was found to be an upstream Bug with Grub2:
  https://savannah.gnu.org/bugs/index.php?64297

  Multiple Ubuntu 22.04.3 Users Affected:
  https://ubuntuforums.org/showthread.php?t=2494397&highlight=zfs+grub+bug
  https://ubuntuforums.org/showthread.php?t=2494957

  Brought up as an issue at OpenZFS:
  https://github.com/openzfs/zfs/issues/13873

  If you look at this comment (https://github.com/openzfs/zfs/issues/13873#issuecomment-1892911836), if was found the Savanaugh at GNU released a fix for it in Grub2 2.12, here:
  https://git.savannah.gnu.org/cgit/grub.git/log/grub-core/fs/zfs/zfs.c

  Ubuntu Jammy 22.04.3 is Grub2 2.06. We need to backported this patch
  to Grub2 2.06 so that Users are not caught of in this bug for or
  currently supported LTS Release.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: grub-efi-amd64 2.06-2ubuntu14.4
  ProcVersionSignature: Ubuntu 6.2.0-39.40~22.04.1-generic 6.2.16
  Uname: Linux 6.2.0-39-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu82.5
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: GNOME
  Date: Thu Feb  1 16:40:28 2024
  InstallationDate: Installed on 2021-09-23 (861 days ago)
  InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
  SourcePackage: grub2-unsigned
  UpgradeStatus: Upgraded to jammy on 2022-08-17 (533 days ago)

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