calcru: runtime went backwards errors

[Wojciech Puchar]

> I've been seeing errors like the following appearing:
>
> Jun 30 03:13:57 ford kernel: calcru: runtime went backwards from 261
> usec to 258 usec for pid 516 (devd)
> Jun 30 03:13:57 ford kernel: calcru: runtime went backwards from 4976
> usec to 4926 usec for pid 367 (pflogd)
> Jun 30 03:13:57 ford kernel: calcru: runtime went backwards from 588
> usec to 582 usec for pid 133 (adjkerntz)
> Jun 30 03:13:57 ford kernel: calcru: runtime went backwards from 681
> usec to 674 usec for pid 20 (swi6: task queue)
> Jun 30 03:13:57 ford kernel: calcru: runtime went backwards from 486
> usec to 481 usec for pid 0 (swapper)
>
> and narrowed down the cause to openntpd.
>
> Do these errors fall into the Mostly Harmless category?
yes.

time turned backward and system get confused.