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

[msaxl]

Public bug reported:

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)

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

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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:
  New

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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