[Bug 1850130] Re: zpools fail to import after reboot on fresh install of eoan

[Didier Roche]

** Also affects: grub2 (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1850130

Title:
  zpools fail to import after reboot on fresh install of eoan

Status in grub2 package in Ubuntu:
  New
Status in zfs-linux package in Ubuntu:
  Confirmed
Status in grub2 source package in Focal:
  New
Status in zfs-linux source package in Focal:
  Confirmed

Bug description:
  Fresh installation of stock Ubuntu 19.10 Eoan with experimental root on ZFS.
  System has existing zpools with data.

  Installation is uneventful. First boot with no problems. Updates
  applied. No other changes from fresh installation. Reboot.

  External pool 'tank' imports with no errors. Reboot.

  External pool has failed to import on boot. In contrast bpool and
  rpool are ok. Manually re-import 'tank' with no issues. I can see both
  'tank' and its path in /dev/disk/by-id/ in /etc/zfs/zpool.cache.
  Reboot.

  'tank' has failed to import on boot. It is also missing from
  /etc/zfs/zpool.cache. Is it possible that the cache is being re-
  generated on reboot, and the newly imported pools are getting erased
  from it? I can re-import the pools again manually with no issues, but
  they don't persist between re-boots.

  Installing normally on ext4 this is not an issue and data pools import
  automatically on boot with no further effort.

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