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

[Alexander Lochmann]

As far as I know, just a few steps are necessary to reproduce this issue:
1. Setup a simple smb server on machine a, like the one I've attached to this report.
2. Create a smb user on machine a: smbpasswd -a $username
3. Enable smb in auto.master on machine b (and set the timeout to something small, e.g., 30 secs):
/media/smb/      program:/etc/auto.smb
4. Save the credentials on machine b: echo "username=$username\npassword=$password" > /etc/creds/machineb
5. Try to access the home directory from machine b:
user at machineb:~$ ls -lh /media/smb/machineb/$username
6. The smb mount is still there after more than 30 seconds

** Attachment added: "smb.conf"
   https://bugs.launchpad.net/ubuntu/+source/autofs/+bug/1754506/+attachment/5078500/+files/smb.conf

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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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