[Bug 1861941] Re: bcache by-uuid links disappear after mounting bcache0

[Launchpad Bug Tracker]

This bug was fixed in the package systemd - 245.6-1ubuntu1

---------------
systemd (245.6-1ubuntu1) groovy; urgency=medium

  [ Balint Reczey ]
  * Merge to Ubuntu from Debian unstable
  - Dropped changes:
    * Don't try calling NULL callback in bus_wait_for_units_clear.
    * test: Skip test-boot-timestamps on permission denied.
    * From journald: stream pid change newline fix
      - debian/patches/lp1875708/journald-Increase-stdout-buffer-size-sooner-when-almost-f.patch
    * meson: initialize time-epoch to reproducible builds compatible value
  * dhclient-exit-hooks.d/timesyncd: Act only when systemd-timesyncd is enabled
    (LP: #1873031)
    File: debian/extra/dhclient-exit-hooks.d/timesyncd
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=7d5a31fb7523d1ecef0d2932df5efa3b99322919
  * debian/udev.postinst: Allow kvm to be an already present non-system group
    (LP: #1880541)
    File: debian/udev.postinst
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=8b5c31828d4323ddb719326b1316c179b7cdbdef
  * Cherry-pick reversion of detecting WSL by the presence of "microsoft" in osrelease
    File: debian/patches/Revert-detect-virt-also-detect-microsoft-as-WSL.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=e13f4452698b84ecb0ca6b7950b5f0c42c02c2cf

  [ Ryan Harper ]
  * Skip over by-uuid/by-label symlinks for bcache backing and cache devices
    (LP: #1861941)
    File: debian/patches/lp1861941-dont-generate-disk-byuuid-for-bcache-uuid.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=4b9a0e888ca40eaed561ec48aece23218fab18ff

systemd (245.6-1) unstable; urgency=medium

  [ Michael Biebl ]
  * New upstream version 245.6
  * Rebase patches

  [ Balint Reczey ]
  * debian/tests/boot-and-services: Handle missing fstab (LP: #1877078)

 -- Balint Reczey <rbalint at ubuntu.com>  Thu, 11 Jun 2020 12:54:02 +0200

** Changed in: systemd (Ubuntu Groovy)
       Status: Invalid => Fix Released

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https://bugs.launchpad.net/bugs/1861941

Title:
  bcache by-uuid links disappear after mounting bcache0

Status in bcache-tools package in Ubuntu:
  Fix Released
Status in linux package in Ubuntu:
  Incomplete
Status in linux-signed package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Fix Released
Status in bcache-tools source package in Focal:
  Confirmed
Status in linux source package in Focal:
  Invalid
Status in linux-signed source package in Focal:
  Confirmed
Status in systemd source package in Focal:
  Invalid
Status in bcache-tools source package in Groovy:
  Fix Released
Status in linux source package in Groovy:
  Incomplete
Status in linux-signed source package in Groovy:
  Confirmed
Status in systemd source package in Groovy:
  Fix Released

Bug description:
  1.
  root at ubuntu:~# lsb_release -rd
  Description:	Ubuntu Focal Fossa (development branch)
  Release:	20.04

  2. 
  root at ubuntu:~# lsb_release -rd
  Description:	Ubuntu Focal Fossa (development branch)
  Release:	20.04
  root at ubuntu:~# apt-cache policy linux-image-virtual 
  linux-image-virtual:
    Installed: 5.4.0.12.15
    Candidate: 5.4.0.12.15
    Version table:
   *** 5.4.0.12.15 500
          500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
          100 /var/lib/dpkg/status
  root at ubuntu:~# apt-cache policy linux-image-5.4.0-12-generic 
  linux-image-5.4.0-12-generic:
    Installed: 5.4.0-12.15
    Candidate: 5.4.0-12.15
    Version table:
   *** 5.4.0-12.15 500
          500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
          100 /var/lib/dpkg/status

  3. mount /dev/bcache0 && ls -al /dev/bcache/by-uuid/
  + ls -al /dev/bcache/by-uuid/
  total 0
  drwxr-xr-x 2 root root 60 Feb  4 23:31 .
  drwxr-xr-x 3 root root 60 Feb  4 23:31 ..
  lrwxrwxrwx 1 root root 13 Feb  4 23:31 abdfd1f6-44ce-4266-91db-24667b9ae51a -> ../../bcache0

  4.
  root at ubuntu:~# ls -al /dev/bcache/by-uuid
  ls: cannot access '/dev/bcache/by-uuid': No such file or directory

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-12-generic 5.4.0-12.15
  ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
  Uname: Linux 5.4.0-12-generic x86_64
  ApportVersion: 2.20.11-0ubuntu16
  Architecture: amd64
  Date: Tue Feb  4 23:31:52 2020
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-signed-5.4
  UpgradeStatus: No upgrade log present (probably fresh install)

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