[Bug 1764853] Re: winbind returns PAM_AUTHINFO_UNAVAIL on first login after reboot

[Andreas Hasenack]

Thanks for your detailed analysis. It was helpful to know all the things
that can nowadays alter ones /etc/nsswitch.conf and change the behavior
in surprising ways.

There is no "wontfix" state in launchpad, so I will mark this as
"invalid" since it was caused by a local configuration issue. Still, as
you said, there is useful information in this bug, and we can always
reopen it if other scenarios where this could happen show up.

** Changed in: samba (Ubuntu)
       Status: Incomplete => Won't Fix

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https://bugs.launchpad.net/bugs/1764853

Title:
  winbind returns PAM_AUTHINFO_UNAVAIL on first login after reboot

Status in samba package in Ubuntu:
  Won't Fix

Bug description:
  The following issue exists only on Ubuntu 18.04

  I've upgraded ubuntu from 17.10 and noticed that winbind does not work well.
  90% of the time I reboot my system I'm getting PAM_AUTHINFO_UNAVAIL when trying to log in with a domain account.
  clicking login again on the login screen most of the time succeeds (so the password is correct)

  I've checked if it works if I wait 10 minutes before logging in, no success, so it is not a timing issue.
  Also I've checked if winbind is working (log in with ssh using a local account)
  getent passwd xy and wbinfo -K user%pwd both work always.

  Now my workaround is putting
  winbind request timeout = 3
  in smb.conf, since the PAM_AUTHINFO_UNAVAIL is returned about 60sec after trying to login. This workaround solves nothing, it only makes logging in faster. (But now it fails mostly two times, but waiting 6 seconds is better than 60)

  To me it seems like deadlock, but I was unable to track it since it
  happens only on the first login. Then I would have to reboot
  (restarting winbind does not trigger it twice, also removing all
  caches in /run/samba does not trigger it twice)

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