[Bug 1874304] Re: grub-probe fails with failed to get canonical path of rpool with ZFS

[Didier Roche]

Hey,

It’s a little bit hard to debug as you opened the bug without using
ubuntu-bug tools which collects a lot of information (you can run
apport-collect to attach more of them).

Some tracks of though to get this going:
- do you mind checking that zfs-initramfs and zfsutils-linux are both installed?
- in general, can you list all zfs packages states? (dpkg -l *zfs*)

This error is mostly grub not being able to load the zfs module (wed
should probably fail earlier than letting grub itself failing). However,
you do have the module loaded as zsysctl is returning you something,
which is puzzling…

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https://bugs.launchpad.net/bugs/1874304

Title:
  grub-probe fails with failed to get canonical path of rpool with ZFS

Status in grub2 package in Ubuntu:
  New

Bug description:
  I've been running Ubuntu 20.04 daily builds for about a month. Within
  the past several days, something broke with grub where it is no longer
  able to probe my ZFS datasets in order to build up its menu. This had
  been working fine, aside from the issue #1867007 I previously filed,
  so I believe this is a regression. As a result of it, I'm unable to
  update my kernel.

  I noticed it when trying to perform a dist-upgrade, but it's
  reproducible running `grub-update` on its own:

  
  ❯ sudo update-grub
  [sudo] password for nirvdrum:
  /usr/sbin/grub-probe: error: failed to get canonical path of `rpool/ROOT/ubuntu_bp7ow2'.

  ❯ zsysctl list
  ID                        ZSys  Last Used
  --                        ----  ---------
  rpool/ROOT/ubuntu_bp7ow2  true  current

  
  I realize that's not much information to go off of. Please let me know what other diagnostic information you would need.

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