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[Aleksandr Mikhalitsyn <1989603@xxxxxxxxxxxxxxxxxx>]

@ernestl 2) @LXD team: What in lxd is responsible for populating
"/var/snap/lxd/common/shmounts/lxcfs"?

https://github.com/canonical/lxd-pkg-snap/blob/0b6e8e9a61c48f87244ccb9b34fb4cd35a007ae6/snapcraft/commands/daemon.start#L149C68-L149C79
and
https://github.com/canonical/lxd-pkg-snap/blob/0b6e8e9a61c48f87244ccb9b34fb4cd35a007ae6/snapcraft/commands/daemon.start#L630

It's daemon.start. It looks like LXCFS daemon wasn't stopped for some
reason or ${SNAP_COMMON}/var/lib/lxcfs was not unmounted.

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https://bugs.launchpad.net/bugs/1989603

Title:
  Can't purge snapd in LXD: rm: cannot remove
  '/var/snap/lxd/common/var/lib/lxcfs/...': Function not implemented

Status in lxd:
  Fix Released
Status in snapd package in Ubuntu:
  Confirmed

Bug description:
  In LXD containers snapd can't be purge-removed. One tool affected by
  this bug is autopkgtest-build-lxd, which attempts to purge several
  packages (including snapd) to create a base image to run autopkgtests
  on.

  Steps to reproduce:

    lxc launch ubuntu:jammy paride-j
    lxc exec paride-j -- apt-get -y remove --purge snapd

  Kinetic is also affected, I didn't test older releases. To see how
  this affects autopkgtest-build-lxd just install autopkgtest and run:

    autopkgtest-build-lxd ubuntu:jammy

  This reminds me of LP: #1903967, but it's likely a different issue.

  --- relevant log excerpt ---

  [...]
  Purging configuration files for snapd (2.56.2+22.04ubuntu1) ...
  Stopping snap.lxd.activate.service
  Stopping unit snap.lxd.activate.service
  Waiting until unit snap.lxd.activate.service is stopped [attempt 1]
  snap.lxd.activate.service is stopped.
  Removing snap.lxd.activate.service
  Stopping snap.lxd.daemon.service
  Stopping unit snap.lxd.daemon.service
  Waiting until unit snap.lxd.daemon.service is stopped [attempt 1]
  snap.lxd.daemon.service is stopped.
  Removing snap.lxd.daemon.service
  Stopping snap.lxd.user-daemon.service
  Stopping unit snap.lxd.user-daemon.service
  Waiting until unit snap.lxd.user-daemon.service is stopped [attempt 1]
  snap.lxd.user-daemon.service is stopped.
  Removing snap.lxd.user-daemon.service
  Stopping snap-core20-1611.mount
  Stopping unit snap-core20-1611.mount
  Waiting until unit snap-core20-1611.mount is stopped [attempt 1]
  snap-core20-1611.mount is stopped.
  Removing snap core20 and revision 1611
  Removing snap-core20-1611.mount
  Stopping snap-lxd-23541.mount
  Stopping unit snap-lxd-23541.mount
  Waiting until unit snap-lxd-23541.mount is stopped [attempt 1]
  snap-lxd-23541.mount is stopped.
  Removing snap lxd and revision 23541
  rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/cpuinfo': Function not implemented
  rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/meminfo': Function not implemented
  rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/stat': Function not implemented
  rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/uptime': Function not implemented
  rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/diskstats': Function not implemented
  rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/swaps': Function not implemented
  rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/loadavg': Function not implemented
  rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/proc/slabinfo': Function not implemented
  rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/sys/devices/system/cpu/cpu0/cpuidle/state5/disable': Function not implemented
  rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/sys/devices/system/cpu/cpu0/cpuidle/state5/above': Function not implemented
  rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/sys/devices/system/cpu/cpu0/cpuidle/state5/time': Function not implemented
  rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/sys/devices/system/cpu/cpu0/cpuidle/state5/rejected': Function not implemented
  rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/sys/devices/system/cpu/cpu0/cpuidle/state5/power': Function not implemented
  rm: cannot remove '/var/snap/lxd/common/var/lib/lxcfs/sys/devices/system/cpu/cpu0/cpuidle/state5/residency': Function not implemented
  [...]

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