[Bug 1887257] Re: update-grub does not create any entry on grub.cfg for ZFS on root

[Julian Andres Klode]

** Changed in: grub2 (Ubuntu)
       Status: New => Incomplete

** Changed in: grub2 (Ubuntu)
       Status: Incomplete => Invalid

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Title:
  update-grub does not create any entry on grub.cfg for ZFS on root

Status in grub2 package in Ubuntu:
  Invalid

Bug description:
  I observed after a lot of updates my kernel did not get update after
  reboot. I found my /boot zfs pool not mounted properly and re-imported
  it, but when I generate new grub.cfg, the 10_linux_zfs section is
  empty, even with /boot mounted properlly:

  root at manauara:~# zpool list
  NAME    SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP    HEALTH  ALTROOT
  bpool  1,88G   196M  1,68G        -         -     0%    10%  1.00x    ONLINE  -
  rpool   114G  43,8G  70,2G        -         -    46%    38%  1.00x    ONLINE  -

  root at manauara:~# mount | grep boot
  bpool/BOOT/ubuntu_bpn5ci on /boot type zfs (rw,nodev,relatime,xattr,posixacl)
  /dev/sdb1 on /boot/efi type vfat (rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
  /dev/sdb1 on /boot/grub type vfat (rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)

  root at manauara:~# cat /etc/fstab 
  # /etc/fstab: static file system information.
  #
  # Use 'blkid' to print the universally unique identifier for a
  # device; this may be used with UUID= as a more robust way to name devices
  # that works even if disks are added and removed. See fstab(5).
  #
  # <file system> <mount point>   <type>  <options>       <dump>  <pass>
  # /boot/efi was on /dev/sdb1 during installation
  UUID=3663-2075  /boot/efi       vfat    umask=0022,fmask=0022,dmask=0022      0       1
  /boot/efi/grub	/boot/grub	none	defaults,bind	0	0
  UUID=9b5b207e-da46-4b16-b827-d8521151c8bf	none	swap	discard	0	0

  root at manauara:~# cat /etc/zfs/zfs-list.cache/bpool
  bpool	/boot	off	on	on	off	on	off	on	off	-	none
  bpool/BOOT	none	off	on	on	off	on	off	on	off	-	none
  bpool/BOOT/ubuntu_bpn5ci	/boot	on	on	on	off	on	off	on	off	-	none

  I have cleaned all snapshots because another issue with zsys and
  images, so my snapshot tree is almost clean:

  root at manauara:~# zfs list -t snapshot
  NAME                                                               USED  AVAIL     REFER  MOUNTPOINT
  bpool/BOOT/ubuntu_bpn5ci at autozsys_n55ov3                          90,6M      -      104M  -
  rpool/ROOT/ubuntu_bpn5ci at autozsys_n55ov3                          43,5M      -     6,22G  -
  rpool/ROOT/ubuntu_bpn5ci/srv at autozsys_n55ov3                         0B      -       96K  -
  rpool/ROOT/ubuntu_bpn5ci/usr at autozsys_n55ov3                         0B      -       96K  -
  rpool/ROOT/ubuntu_bpn5ci/usr/local at autozsys_n55ov3                   0B      -     2,94M  -
  rpool/ROOT/ubuntu_bpn5ci/var at autozsys_n55ov3                         0B      -       96K  -
  rpool/ROOT/ubuntu_bpn5ci/var/games at autozsys_n55ov3                   0B      -       96K  -
  rpool/ROOT/ubuntu_bpn5ci/var/lib at autozsys_n55ov3                   464K      -     7,93G  -
  rpool/ROOT/ubuntu_bpn5ci/var/lib/AccountsService at autozsys_n55ov3     0B      -      336K  -
  rpool/ROOT/ubuntu_bpn5ci/var/lib/NetworkManager at autozsys_n55ov3    116K      -      168K  -
  rpool/ROOT/ubuntu_bpn5ci/var/lib/apt at autozsys_n55ov3               136K      -     95,7M  -
  rpool/ROOT/ubuntu_bpn5ci/var/lib/dpkg at autozsys_n55ov3             2,32M      -     55,2M  -
  rpool/ROOT/ubuntu_bpn5ci/var/log at autozsys_n55ov3                  7,54M      -     1,13G  -
  rpool/ROOT/ubuntu_bpn5ci/var/mail at autozsys_n55ov3                    0B      -       96K  -
  rpool/ROOT/ubuntu_bpn5ci/var/snap at autozsys_n55ov3                    0B      -     2,17M  -
  rpool/ROOT/ubuntu_bpn5ci/var/spool at autozsys_n55ov3                  56K      -      208K  -
  rpool/ROOT/ubuntu_bpn5ci/var/www at autozsys_n55ov3                     0B      -       96K  -
  rpool/USERDATA/leonardo_xoeglb at autozsys_n55ov3                    16,8M      -     27,0G  -
  rpool/USERDATA/leonardo_xoeglb at autozsys_qc46s7                    7,86M      -     27,0G  -
  rpool/USERDATA/root_xoeglb at autozsys_n55ov3                         132K      -     1,17G  -

  
  The output of upgrade-grub (With sh -x in 10_linux_zen) is attached and other system information is at ubuntu-bug report attached.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: grub2-common 2.04-1ubuntu26
  ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
  Uname: Linux 5.4.0-40-generic x86_64
  NonfreeKernelModules: nvidia_modeset zfs zunicode zavl icp zcommon znvpair nvidia
  ApportVersion: 2.20.11-0ubuntu27.3
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Jul 11 20:24:10 2020
  InstallationDate: Installed on 2020-04-27 (75 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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