[Bug 1848496] Re: [zfs-root] "device-mapper: reload ioctl on osprober-linux-sdaX failed: Device or resource busy" against devices owned by ZFS

[Brian Willoughby]

Just ran into this error today.
Recently upgraded to 19.10 and decided to try the ZFS instead of mdadm mirroring.
All was going well; until I tried to install cifs-utils for a Samba link to my office --> error (exact as in title).
This worked fine on my previous 18.04 load.
The link in #7 says a fix would 'be nice to have'; but not being able to load cifs for xfreerdp is a big problem for me.
Have not yet found any work-around.
suggestions?

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Title:
  [zfs-root] "device-mapper: reload ioctl on osprober-linux-sdaX
  failed: Device or resource busy" against devices owned by ZFS

Status in os-prober package in Ubuntu:
  Confirmed
Status in zfs-linux package in Ubuntu:
  Confirmed

Bug description:
  On a 19.10 (pre-release, 20191016 daily) zfs installation, running
  'os-prober' (as 'update-grub' does by default) triggers the following
  error message:

  x at x:~$ sudo os-prober; echo $?
  device-mapper: reload ioctl on osprober-linux-sda5  failed: Device or resource busy
  Command failed.
  0
  x at x:~$

  The exit code is 0, so update-grub does not fail as a result.

  
  Partitions on the only available storage (automatically setup by installer):

  x at x:~$ sudo fdisk /dev/sda -l
  Disk /dev/sda: 10 GiB, 10737418240 bytes, 20971520 sectors
  Disk model: VBOX HARDDISK   
  Units: sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes
  Disklabel type: gpt
  Disk identifier: AB7BECFB-5946-48B2-9C59-D2B1261E29A5

  Device       Start      End  Sectors  Size Type
  /dev/sda1     2048  1050623  1048576  512M EFI System
  /dev/sda2  1050624  1153023   102400   50M Linux filesystem
  /dev/sda3  1153024  2070527   917504  448M Linux swap
  /dev/sda4  2070528  6264831  4194304    2G Solaris boot
  /dev/sda5  6264832 20971486 14706655    7G Solaris root
  x at x:~$ 

  
  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: os-prober 1.74ubuntu2
  ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
  Uname: Linux 5.3.0-18-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu8
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Oct 17 14:19:59 2019
  InstallationDate: Installed on 2019-10-17 (0 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191016.5)
  SourcePackage: os-prober
  UpgradeStatus: No upgrade log present (probably fresh install)

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