[Bug 1886206] Re: os-prober fails to reload ioctl on a bcache device

[Alexander Lelyakin]

Patch to ignore bcache in os-prober is published already in 2017:

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=864246

All advises to use GRUB_OS_PROBER_SKIP_LIST are irrelevant as this list
is applied to the results of os-prober. And the error message appears
during run of os-prober.

** Bug watch added: Debian Bug tracker #864246
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=864246

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Title:
  os-prober fails to reload ioctl on a bcache device

Status in os-prober package in Ubuntu:
  Confirmed

Bug description:
  Every time a new kernel is installed or GRUB is updated, the message
  "device-mapper: reload ioctl on osprober-linux-nvme0n1p4  failed"
  appears. The partition is used by bcache as caching device. The
  backing device does not report any error.

  lsblk output:

  NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
  sda           8:0    0   2,7T  0 disk 
  └─bcache0   252:0    0   2,7T  0 disk /home
  nvme0n1     259:0    0 465,8G  0 disk 
  ├─nvme0n1p1 259:1    0   200M  0 part /boot/efi
  ├─nvme0n1p2 259:2    0     1G  0 part /boot
  ├─nvme0n1p3 259:3    0    80G  0 part /
  └─nvme0n1p4 259:4    0 384,6G  0 part 
    └─bcache0 252:0    0   2,7T  0 disk /home

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: os-prober 1.74ubuntu2
  ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
  Uname: Linux 5.4.0-40-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.3
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Jul  3 17:12:40 2020
  InstallationDate: Installed on 2014-06-05 (2219 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  SourcePackage: os-prober
  UpgradeStatus: Upgraded to focal on 2020-04-26 (67 days ago)

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