Public bug reported:

Install "hello-world". In one terminal, run hello-world.sh and "cd
$SNAP" in it.

In another terminal, run "snap remove hello-world". Notice that it
doesn't quit. Snapd prints something about not being able to unmount,
and it hangs or crashes or something.

It is not waiting for the running "sh" process to finish. You can now go
back to the other terminal and exit the shell. (Wait a few minutes, and
exit that terminal too. This might matter somehow!)

Now nothing is holding open the umount request, but the running "snap"
command doesn't finish.

You're forced to control-c the snap request. There's a good possibility
that the snap state is stuck somehow until next reboot (for a normal
user).

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

** Description changed:

  Install "hello-world". In one terminal, run hello-world.sh and "cd
  $SNAP" in it.
  
  In another terminal, run "snap remove hello-world". Notice that it
  doesn't quit. Snapd prints something about not being able to unmount,
  and it hangs or crashes or something.
  
  It is not waiting for the running "sh" process to finish. You can now go
- back to the other terminal and exit the shell. And exit that terminal.
+ back to the other terminal and exit the shell. (Wait a few minutes, and
+ exit that terminal too. This might matter somehow!)
  
  Now nothing is holding open the umount request, but the running "snap"
  command doesn't finish.
  
  You're forced to control-c the snap request. There's a good possibility
  that the snap state is stuck somehow until next reboot (for a normal
  user).

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https://bugs.launchpad.net/bugs/1592088

Title:
  snap command doesn't finish when snapd already gave up

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