[Bug 1834095] Re: update-grub fails on zfs with root and boot datasets

[David R. Bergstein]

zfs get all bpool/BOOT/ubuntu
NAME               PROPERTY              VALUE                  SOURCE
bpool/BOOT/ubuntu  type                  filesystem             -
bpool/BOOT/ubuntu  creation              Sat Apr 27 22:23 2019  -
bpool/BOOT/ubuntu  used                  211M                   -
bpool/BOOT/ubuntu  available             155M                   -
bpool/BOOT/ubuntu  referenced            116M                   -
bpool/BOOT/ubuntu  compressratio         1.05x                  -
bpool/BOOT/ubuntu  mounted               yes                    -
bpool/BOOT/ubuntu  quota                 none                   default
bpool/BOOT/ubuntu  reservation           none                   default
bpool/BOOT/ubuntu  recordsize            128K                   default
bpool/BOOT/ubuntu  mountpoint            legacy                 local
bpool/BOOT/ubuntu  sharenfs              off                    default
bpool/BOOT/ubuntu  checksum              on                     default
bpool/BOOT/ubuntu  compression           lz4                    inherited from bpool
bpool/BOOT/ubuntu  atime                 on                     default
bpool/BOOT/ubuntu  devices               off                    inherited from bpool
bpool/BOOT/ubuntu  exec                  on                     default
bpool/BOOT/ubuntu  setuid                on                     default
bpool/BOOT/ubuntu  readonly              off                    default
bpool/BOOT/ubuntu  zoned                 off                    default
bpool/BOOT/ubuntu  snapdir               hidden                 default
bpool/BOOT/ubuntu  aclinherit            restricted             default
bpool/BOOT/ubuntu  createtxg             36                     -
bpool/BOOT/ubuntu  canmount              noauto                 local
bpool/BOOT/ubuntu  xattr                 sa                     inherited from bpool
bpool/BOOT/ubuntu  copies                1                      default
bpool/BOOT/ubuntu  version               5                      -
bpool/BOOT/ubuntu  utf8only              on                     -
bpool/BOOT/ubuntu  normalization         formD                  -
bpool/BOOT/ubuntu  casesensitivity       sensitive              -
bpool/BOOT/ubuntu  vscan                 off                    default
bpool/BOOT/ubuntu  nbmand                off                    default
bpool/BOOT/ubuntu  sharesmb              off                    default
bpool/BOOT/ubuntu  refquota              none                   default
bpool/BOOT/ubuntu  refreservation        none                   default
bpool/BOOT/ubuntu  guid                  15745059723263933600   -
bpool/BOOT/ubuntu  primarycache          all                    default
bpool/BOOT/ubuntu  secondarycache        all                    default
bpool/BOOT/ubuntu  usedbysnapshots       95.8M                  -
bpool/BOOT/ubuntu  usedbydataset         116M                   -
bpool/BOOT/ubuntu  usedbychildren        0B                     -
bpool/BOOT/ubuntu  usedbyrefreservation  0B                     -
bpool/BOOT/ubuntu  logbias               latency                default
bpool/BOOT/ubuntu  dedup                 off                    default
bpool/BOOT/ubuntu  mlslabel              none                   default
bpool/BOOT/ubuntu  sync                  standard               default
bpool/BOOT/ubuntu  dnodesize             legacy                 default
bpool/BOOT/ubuntu  refcompressratio      1.09x                  -
bpool/BOOT/ubuntu  written               90.9M                  -
bpool/BOOT/ubuntu  logicalused           223M                   -
bpool/BOOT/ubuntu  logicalreferenced     126M                   -
bpool/BOOT/ubuntu  volmode               default                default
bpool/BOOT/ubuntu  filesystem_limit      none                   default
bpool/BOOT/ubuntu  snapshot_limit        none                   default
bpool/BOOT/ubuntu  filesystem_count      none                   default
bpool/BOOT/ubuntu  snapshot_count        none                   default
bpool/BOOT/ubuntu  snapdev               hidden                 default
bpool/BOOT/ubuntu  acltype               posixacl               inherited from bpool
bpool/BOOT/ubuntu  context               none                   default
bpool/BOOT/ubuntu  fscontext             none                   default
bpool/BOOT/ubuntu  defcontext            none                   default
bpool/BOOT/ubuntu  rootcontext           none                   default
bpool/BOOT/ubuntu  relatime              on                     inherited from bpool
bpool/BOOT/ubuntu  redundant_metadata    all                    default
bpool/BOOT/ubuntu  overlay               off                    default

/etc/fstab:

bpool/BOOT/ubuntu /boot zfs nodev,relatime,x-systemd.requires=zfs-import-bpool.service 0 0
rpool/var/log /var/log zfs nodev,relatime 0 0
rpool/var/spool /var/spool zfs nodev,relatime 0 0
rpool/var/tmp /var/tmp zfs nodev,relatime 0 0
rpool/tmp /tmp zfs nodev,relatime 0 0

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https://bugs.launchpad.net/bugs/1834095

Title:
  update-grub fails on zfs with root and boot datasets

Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  This issue was encountered on a virtual machine installation of Ubuntu
  19.10 running zfs.  After reloading several times from backup and
  placing the original version of grub2 on hold it was verified that
  upgrading to the newer version of grub caused update-grub to
  improperly detect the two zfs datasets, bpool (boot pool) and rpool
  (root pool).

  To recap:
  1) lsb_release -rd
  Description:    Ubuntu Eoan Ermine (development branch)
  Release:        19.10
  2) apt-cache policy grub-pc
  grub-pc:
    Installed: 2.02+dfsg1-12ubuntu2
    Candidate: 2.02+dfsg1-12ubuntu3 (version with issue in this report)
    Version table:
       2.02+dfsg1-12ubuntu3 500
          500 http://archive.ubuntu.com/ubuntu eoan/main amd64 Packages
   *** 2.02+dfsg1-12ubuntu2 100
          100 /var/lib/dpkg/status
  3) What I expected to happen: update-grub runs without error
  4) What happened instead: update-grub did not run correctly, resulting in unbootable system (only entries for memtest86+ in grub menu).

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