calcru: negative time ... followed by freeze

[Bruce Evans]

On Mon, 21 Jun 2004, Bjoern A. Zeeb wrote:

> On Mon, 21 Jun 2004, Bruce Evans wrote:
>
> > The bug seems to be unrelated to KSE.  It is related to SMP.  RELENG_4 has
> > the bug, and pre-KSE versions have a proc state that indicates if we have
> > a running process which can't be handled right.
>
> I just wonder if for RELENG_4 it is the follwoing problem
> (other error message) ?
>
> http://www.freebsd.org/cgi/query-pr.cgi?pr=43491

That is a different problem.  [It is for microtime(), though calcru() warns
about it too.]  timecounters are buggier in RELENG_4, and they really do
sometimes go backwards.

The bugs just fixed in -current only affect ^T in RELENG_4.

Bruce