Dear Craig,

Thanks for re-opening.
(Good that finally you were able to observe yourself.)

> could btime be wrong?

I always suspected exactly that!

Suspected, because I do not really know how any of this works.
The way I understood things (this is probably totally wrong):

Process times, including start times, are counted in "jiffies", some
count that is monotonically increasing; and it is "known" that one jiffy
is some fraction of a second. But that does not take into account time
adjustments (say by ntpd). When time is adjusted, the "current jiffy" is
left unchanged: not incremented when that would be appropriate, also
never decremented as neither time nor jiffies are ever set backwards but
some other slowdown mechanism is used. Either the set-forward should use
some speedup mechanism similar to slowdown, or increment jiffies
together with the time.

Hope the above makes some sense.

Cheers, Paul
-- 
Paul Szabo       p...@maths.usyd.edu.au       www.maths.usyd.edu.au/u/psz
School of Mathematics and Statistics   University of Sydney    Australia

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