[Bug 1754506] [NEW] AutoFS does not automatically umount SMB shares

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Description:    Ubuntu 17.10
Release:        17.10

autofs:
  Installed: 5.1.2-1ubuntu1
  Candidate: 5.1.2-1ubuntu1
  Version table:
 *** 5.1.2-1ubuntu1 500
        500 http://de.archive.ubuntu.com/ubuntu artful/main amd64 Packages
        100 /var/lib/dpkg/status

Kernel: self-built 4.15.6

What I expect:
I expect AutoFS to automatically unmount my samba share after the timeout. However, it does not. The share is still mounted.
I've turned the autofs debug output in the kernel module. As far as I can tell, the kernel thinks the cifs mount is still busy.

I'm using the smb automount script provided by the package: /etc/auto.smb. I've just added an additional cifs parameter(vers=2.0).
My auto.master looks as follows:
/media/smb/      program:/etc/auto.smb

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

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AutoFS does not automatically umount SMB shares
https://bugs.launchpad.net/bugs/1754506
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