dbus：[系统] 无法激活服务“org.freedesktop.login1”：超时

Question

我在其中一台服务器的系统日志中不断收到以下错误消息：

# tail /var/log/syslog
Oct 29 13:48:40 myserver dbus[19617]: [system] Failed to activate service 'org.freedesktop.login1': timed out
Oct 29 13:48:40 myserver dbus[19617]: [system] Activating via systemd: service name='org.freedesktop.login1' unit='dbus-org.freedesktop.login1.service'
Oct 29 13:49:05 myserver dbus[19617]: [system] Failed to activate service 'org.freedesktop.login1': timed out
Oct 29 13:49:05 myserver dbus[19617]: [system] Activating via systemd: service name='org.freedesktop.login1' unit='dbus-org.freedesktop.login1.service'

它们似乎与 ProFTPd 守护程序上的 FTP 登录相关：

# tail /var/log/proftpd/proftpd.log
2015-10-29 13:48:40,433 myserver proftpd[17872] myserver.example.com (remote.example.com[192.168.22.33]): USER switch: Login successful.
2015-10-29 13:48:40,460 myserver proftpd[17872] myserver.example.com (remote.example.com[192.168.22.33]): FTP session closed.
2015-10-29 13:48:40,664 myserver proftpd[17881] myserver.example.com (remote.example.com[192.168.22.33]): FTP session opened.
2015-10-29 13:49:05,687 myserver proftpd[17881] myserver.example.com (remote.example.com[192.168.22.33]): USER switch: Login successful.
2015-10-29 13:49:05,705 myserver proftpd[17881] myserver.example.com (remote.example.com[192.168.22.33]): FTP session closed.
2015-10-29 13:49:05,908 myserver proftpd[17915] myserver.example.com (remote.example.com[192.168.22.33]): FTP session opened.

不过，FTP 登录本身似乎对用户没有问题。我有几台其他服务器也在运行 ProFTPd，但到目前为止从未出现过这些错误。

不过，它们可能与最近从 Debian 7 升级到 Debian 8 相关。

任何想法消息想告诉我什么，甚至是什么导致它们？

我已经尝试重新启动 dbus 和 proftpd 守护进程，甚至服务器，并确保 DBUS 套接字 /var/run/dbus/system_bus_socket 存在，但到目前为止消息还在不断出现。

编辑： 评论中要求的 journalctl 输出：

root@myserver:/home/chammers# systemctl status -l dbus-org.freedesktop.login1.service
? systemd-logind.service - Login Service
   Loaded: loaded (/lib/systemd/system/systemd-logind.service; static)
   Active: active (running) since Tue 2015-10-27 13:23:32 CET; 1 weeks 0 days ago
     Docs: man:systemd-logind.service(8)
           man:logind.conf(5)
           http://www.freedesktop.org/wiki/Software/systemd/logind
           http://www.freedesktop.org/wiki/Software/systemd/multiseat
 Main PID: 467 (systemd-logind)
   Status: "Processing requests..."
   CGroup: /system.slice/systemd-logind.service
           ??467 /lib/systemd/systemd-logind

Oct 28 10:15:25 myserver systemd-logind[467]: New session c3308 of user switch.
Oct 28 10:15:25 myserver systemd-logind[467]: Removed session c3308.
Oct 28 10:15:25 myserver systemd-logind[467]: New session c3309 of user switch.
Oct 28 10:15:25 myserver systemd-logind[467]: Removed session c3309.
Oct 28 10:15:25 myserver systemd-logind[467]: New session c3310 of user switch.
Oct 28 10:15:25 myserver systemd-logind[467]: Removed session c3310.
Oct 28 10:15:25 myserver systemd-logind[467]: New session c3311 of user switch.
Oct 28 10:15:25 myserver systemd-logind[467]: Removed session c3311.
Oct 28 10:19:52 myserver systemd-logind[467]: New session 909 of user chammers.
Oct 28 10:27:11 myserver systemd-logind[467]: Failed to abandon session scope: Transport endpoint is not connected

还有更多 journalctl 输出：

Nov 03 16:21:19 myserver dbus[19617]: [system] Failed to activate service 'org.freedesktop.login1': timed out
Nov 03 16:21:19 myserver proftpd[23417]: pam_systemd(proftpd:session): Failed to create session: Activation of org.freedesktop.login1 timed out
Nov 03 16:21:19 myserver proftpd[23418]: pam_systemd(proftpd:session): Failed to create session: Activation of org.freedesktop.login1 timed out
Nov 03 16:21:19 myserver proftpd[23417]: pam_unix(proftpd:session): session closed for user switch
Nov 03 16:21:19 myserver proftpd[23418]: pam_unix(proftpd:session): session closed for user switch
Nov 03 16:21:19 myserver proftpd[23420]: pam_unix(proftpd:session): session opened for user switch by (uid=0)
Nov 03 16:21:19 myserver dbus[19617]: [system] Activating via systemd: service name='org.freedesktop.login1' unit='dbus-org.freedesktop.login1.service'
Nov 03 16:21:19 myserver proftpd[23421]: pam_unix(proftpd:session): session opened for user switch by (uid=0)

Answer 1

重启登录：

# systemctl restart systemd-logind

请注意，重新启动 dbus 将再次断开它们的连接。

Answer 2

重新启动是唯一对我有用的解决方案。我杀死了失控的 dbus 进程，其他事情失败了。

这是我尝试重新加载 httpd 时发生的情况-

Error getting authority: Error initializing authority: Error calling StartServiceByName for org.freedesktop.PolicyKit1: GDBus.Error:org.freedesktop.DBus.Error.TimedOut: Activation of org.freedesktop.PolicyKit1 timed out (g-dbus-error-quark, 20)
Failed to reload httpd.service: Connection timed out

Centos7 有问题。