[Bug 1728055] Re: GDM3 hangs, if local home directory is not accessible

[Andreas Hasenack]

But the terminal login shouldn't suffer from this root-can't-read-home,
should it? Didn't you experience this there as well?

If the problem is indeed root-squash, then the login should also fail
without autofs. Just mount the home directory first. Can you get this
down to a very simple test case with a new machine or vm?

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Title:
  GDM3 hangs, if local home directory is not accessible

Status in autofs package in Ubuntu:
  Incomplete

Bug description:
  In Ubuntu 17.10 with GDM 3.26.1-3ubuntu3, the greeter will hang, if
  local /home directory is not accessible.

  Our setup:
  - Ubuntu Server (16.04) with DNS, LDAP, Kerberos 5 and NFS servers. The home directories are present on the server and made available via NFS with krb5 authentication. LDAP provides the user data for clients.
  - Ubuntu client (17.10), bound to the server, uses AutoFS to automount remote home directories under /home. This makes the otherwise present local user directories unaccessible.

  Expected behaviour: After system startup, the greeter should provide a way for users to log in.
  Actual behaviour: The system hangs before the greeter displays the user list (but it does display the top menu bar and Ubuntu logo at the bottom).

  Additional remarks:
  If the settings for local users under /var/lib/AccountsService/users contain SystemAccount=true, the greeter will work as expected (while not displaying local users). This is a workaround, that I'm using right now. BUT: if the network user will log in and invoke the authentication dialog for system-wide settings (e.g. if he will try to add a new printer, or change the system update settings), the system will hang before displaying the expected dialog window. Also if a local user will try to log in by entering his login name and password, the system will hang (it should either produce an error message, or log in without a home directory).

  AutoFS uses this line to mount the remote home directories under /home:
  * -fstype=nfs4,rw,intr,sec=krb5 FQDN:/home/&

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