Public bug reported:

Hi,

today while inspecting logs with journalctl, I noticed error messages
during shutdown (see below).  The problem is that some (but not all)
snaps fail to unmount.  For instance:

sept. 15 11:20:01 vougeot systemd[1]: snap-hello\x2dworld-27.mount: Mount 
process exited, code=exited status=32
sept. 15 11:20:01 vougeot systemd[1]: Failed unmounting Mount unit for 
hello-world.

# snap list
Name              Version            Rev   Developer      Notes
atom              1.19.4             30    snapcrafters   classic
chromium          60.0.3112.101      9     canonical      -
core              16-2.28~rc3        2925  canonical      core
darktable-kyrofa  2.2.5snap1         34    kyrofa         -
falkon            master+ca377a0     23    kde            -
hello-world       6.3                27    canonical      -
inkscape          0.92.2             3208  inkscape       -
katomic           16.12.3            2     kde            -
kblocks           16.12.3            10    kde            -
kde-frameworks-5  5.37.0             13    kde            -
kodi              18.0-alpha1        6     wsnipex        -
krita             3.2.0              26    krita          -
libreoffice       5.3.4.2            21    canonical      -
vectr             0.1.15             2     vectr          -
vlc               daily              4     videolan       -
vscode            1.15.1-1502903936  17    flexiondotorg  classic
wormhole          0.10.2             14    snapcrafters   -

End of shutdown log containing error messages:

sept. 15 11:20:01 vougeot systemd[1]: Stopped Load/Save Random Seed.
sept. 15 11:20:01 vougeot systemd[1]: Stopped Raise network interfaces.
sept. 15 11:20:01 vougeot systemd[1]: Stopped Apply Kernel Variables.
sept. 15 11:20:01 vougeot systemd[1]: Stopped Load Kernel Modules.
sept. 15 11:20:01 vougeot systemd[1]: Stopped target Local File Systems.
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for vlc...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting /run/user/110...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for core...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting /run/snapd/ns/inkscape.mnt...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting /run/snapd/ns/chromium.mnt...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for vscode...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for vectr...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for krita...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for inkscape...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for wormhole...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for 
darktable-kyrofa...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for libreoffice...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for chromium...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for katomic...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for hello-world...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting /run/snapd/ns/falkon.mnt...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for 
kde-frameworks-5...
sept. 15 11:20:01 vougeot systemd[1]: Stopped target Network (Pre).
sept. 15 11:20:01 vougeot systemd[1]: Unmounting /run/user/1000...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for kodi...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for atom...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for falkon...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for kblocks...
sept. 15 11:20:01 vougeot systemd[1]: Unmounted /run/user/110.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for core.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for vectr.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for krita.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for darktable-kyrofa.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for libreoffice.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for vlc.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted /run/snapd/ns/chromium.mnt.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for vscode.
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for chromium...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for katomic...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for hello-world...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting /run/snapd/ns/falkon.mnt...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for 
kde-frameworks-5...
sept. 15 11:20:01 vougeot systemd[1]: Stopped target Network (Pre).
sept. 15 11:20:01 vougeot systemd[1]: Unmounting /run/user/1000...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for kodi...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for atom...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for falkon...
sept. 15 11:20:01 vougeot systemd[1]: Unmounting Mount unit for kblocks...
sept. 15 11:20:01 vougeot systemd[1]: Unmounted /run/user/110.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for core.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for vectr.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for krita.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for darktable-kyrofa.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for libreoffice.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for vlc.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted /run/snapd/ns/chromium.mnt.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for vscode.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for chromium.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for inkscape.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for kde-frameworks-5.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for atom.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted Mount unit for kblocks.
sept. 15 11:20:01 vougeot systemd[1]: snap-wormhole-14.mount: Mount process 
exited, code=exited status=32
sept. 15 11:20:01 vougeot systemd[1]: Failed unmounting Mount unit for wormhole.
sept. 15 11:20:01 vougeot systemd[1]: snap-katomic-2.mount: Mount process 
exited, code=exited status=32
sept. 15 11:20:01 vougeot systemd[1]: Failed unmounting Mount unit for katomic.
sept. 15 11:20:01 vougeot systemd[1]: snap-hello\x2dworld-27.mount: Mount 
process exited, code=exited status=32
sept. 15 11:20:01 vougeot systemd[1]: Failed unmounting Mount unit for 
hello-world.
sept. 15 11:20:01 vougeot systemd[1]: run-user-1000.mount: Mount process 
exited, code=exited status=32
sept. 15 11:20:01 vougeot systemd[1]: Failed unmounting /run/user/1000.
sept. 15 11:20:01 vougeot systemd[1]: snap-kodi-6.mount: Mount process exited, 
code=exited status=32
sept. 15 11:20:01 vougeot systemd[1]: Failed unmounting Mount unit for kodi.
sept. 15 11:20:01 vougeot systemd[1]: run-snapd-ns-falkon.mnt.mount: Mount 
process exited, code=exited status=32
sept. 15 11:20:01 vougeot systemd[1]: Failed unmounting 
/run/snapd/ns/falkon.mnt.
sept. 15 11:20:01 vougeot systemd[1]: snap-falkon-23.mount: Mount process 
exited, code=exited status=32
sept. 15 11:20:01 vougeot systemd[1]: Failed unmounting Mount unit for falkon.
sept. 15 11:20:01 vougeot systemd[1]: Unmounted /run/snapd/ns/inkscape.mnt.
sept. 15 11:20:01 vougeot systemd[1]: Unmounting /run/snapd/ns...
sept. 15 11:20:01 vougeot systemd[1]: Unmounted /run/snapd/ns.
sept. 15 11:20:01 vougeot systemd[1]: Reached target Unmount All Filesystems.
sept. 15 11:20:01 vougeot systemd[1]: Stopped target Local File Systems (Pre).
sept. 15 11:20:01 vougeot systemd[1]: Stopped Remount Root and Kernel File 
Systems.
sept. 15 11:20:01 vougeot systemd[1]: Stopped Create Static Device Nodes in 
/dev.
sept. 15 11:20:01 vougeot systemd[1]: Reached target Shutdown.
sept. 15 11:20:01 vougeot systemd[1]: Reached target Final Step.
sept. 15 11:20:01 vougeot systemd[1]: Starting Reboot...
sept. 15 11:20:01 vougeot systemd[1]: Shutting down.
sept. 15 11:20:02 vougeot kernel: systemd-shutdow: 27 output lines suppressed 
due to ratelimiting
sept. 15 11:20:02 vougeot systemd-journald[307]: Journal stopped
-- Reboot --

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: snapd 2.27.6+17.04
Uname: Linux 4.13.2-041302-generic x86_64
ApportVersion: 2.20.4-0ubuntu4.5
Architecture: amd64
CurrentDesktop: KDE
Date: Fri Sep 15 11:36:16 2017
EcryptfsInUse: Yes
SourcePackage: snapd
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: snapd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug package-from-proposed zesty

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Title:
  Error messages on shutdown : Failed unmounting Mount unit

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