Comment # 3 on bug 899252 from Benjamin Poirier

(In reply to Bernhard Wiedemann from comment #1)
[...]
> 
> could it be that the hardware clock is not good and starting at 1970?
> e.g. try as root
> hwclock
> hwclock -w

    # fresh after boot
    ben@f1:~$ su -
    Password:
    root@f1:~# l /var/lib/sudo/
    total 0
    drwx--x--x 1 root root  20 Sep 28 20:30 .
    drwxr-xr-x 1 root root 802 Oct  3 00:00 ..
    drwx------ 1 root root   6 Sep 28 20:30 lectured
    drwx------ 1 root root   6 Sep 28 20:30 ts
    root@f1:~# l /var/lib/sudo/lectured/
    total 0
    drwx------ 1 root root   6 Sep 28 20:30 .
    drwx--x--x 1 root root  20 Sep 28 20:30 ..
    -rw------- 1 root users  0 Sep 28 20:30 ben
    root@f1:~# l /var/lib/sudo/ts/
    total 4.0K
    drwx------ 1 root root    6 Sep 28 20:30 .
    drwx--x--x 1 root root   20 Sep 28 20:30 ..
    -rw------- 1 root users 200 Oct  3 10:22 ben
    root@f1:~# date
    Fri Oct  3 10:48:17 PDT 2014
    root@f1:~# hwclock
    Fri Oct  3 10:48:39 2014  -0.864546 seconds
    root@f1:~# logout
    ben@f1:~$ sudo su -
    sudo: ignoring time stamp from the future
    root's password:
    root@f1:~# l /var/lib/sudo/
    total 0
    drwx--x--x 1 root root  20 Sep 28 20:30 .
    drwxr-xr-x 1 root root 802 Oct  3 00:00 ..
    drwx------ 1 root root   6 Sep 28 20:30 lectured
    drwx------ 1 root root   6 Sep 28 20:30 ts
    root@f1:~# l /var/lib/sudo/lectured/
    total 0
    drwx------ 1 root root   6 Sep 28 20:30 .
    drwx--x--x 1 root root  20 Sep 28 20:30 ..
    -rw------- 1 root users  0 Sep 28 20:30 ben
    root@f1:~# l /var/lib/sudo/ts/
    total 8.0K
    drwx------ 1 root root    6 Sep 28 20:30 .
    drwx--x--x 1 root root   20 Sep 28 20:30 ..
    -rw------- 1 root users 200 Oct  3 10:49 ben
    root@f1:~# logout
    ben@f1:~$
    ben@f1:~$ sudo su -
    # notice, no message now
    root@f1:~# 

Please note that I run a sudo with a non-default configuration which includes
    Defaults !tty_tickets

I verified that the problem does not occur without that line.