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[Martin Pitt <martin.pitt@xxxxxxxxxx>]

Does that happen with any service? Or is that specific to smbd and sssd?
I suppose 'service' is not the culprit here, and it also happens if you
directly call "sudo systemctl restart smbd.service"?

Can you please do

  sudo systemd-analyze set-log-level debug
  sudo systemctl restart systemd-udevd
  sudo systemd-analyze set-log-level debug
  sudo journalctl -b > /tmp/journal.txt

and attach /tmp/journal.txt here?

** Changed in: systemd (Ubuntu)
       Status: New => Incomplete

** Summary changed:

- Unable to restart services from scripts
+ restarting services hangs on systemd-tty-ask-password-agent

-- 
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Touch seeded packages, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1456789

Title:
  restarting services hangs on systemd-tty-ask-password-agent

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  I have a script run as root from cron that tweaks smb.conf and
  restarts smbd and winbind. Problem is, starting today after working
  perfectly up till yesterday, this script now hangs on Ubuntu 15.04.
  When run from cron, the process tree looks like this:

  service smbd restart
   \_ systemctl restart smbd.service
        \_ /bin/systemd-tty-ask-password-agent --watch
        \_ /usr/bin/pkttyagent --notify-fd 5 --fallback

  Run from a shell via sudo, same thing except the process tree
  (obviously) includes the sudo command. It times out after 5 minutes,
  causing the script to fail. If I manually kill the processes, it fails
  faster.

  The simplest possible scripts that reproduce this, run as root or
  through cron or via sudo, are:

  #!/bin/sh
  service smbd restart

  #!/bin/sh
  systemctl restart smbd.service

  Using 'service', this works perfectly on Ubuntu 14.04 and 14.10, and
  until this morning worked perfectly on 15.04 as well.

  1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
  Ubuntu 15.04
  2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
  systemd 219-7ubuntu5
  samba 2:4.1.13+dfsg-4ubuntu3
  3) What you expected to happen
  Services to restart
  4) What happened instead
  Services didn't restart, 'systemctl' hung

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