[Bug 1754506] Re: AutoFS does not automatically umount SMB shares

[ChristianEhrhardt]

Hi Alexander,
this seems to be a reoccuring issue but so far always turned out to be a config issue.
E.g. for some hints and similar cases:
https://ubuntuforums.org/showthread.php?t=1355715
https://askubuntu.com/questions/194727/mounting-samba-share-whenever-its-available-unmounting-when-its-not

The description above isn't enough to reproduce and debug, so I'll mark
it incomplete for now.

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Title:
  AutoFS does not automatically umount SMB shares

Status in autofs package in Ubuntu:
  Incomplete

Bug description:
  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

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