calcru: negative time ... followed by freeze

[Don Lewis]

On 20 Jun, Robert Watson wrote:
> FYI, this is a Xeon box with two physical processors, each with two
> logical processors, and the problem could well be SMP-related.

The hang might be SMP-related, but I just started getting the calcru
messages on my UP Athlon XP box.  I just upgraded to today's
-CURRENT from a week-old version, and my console got spammed by a bunch
of these messages while I was running portupgrade.

calcru: negative time of 0 usec for pid 21261 (sh)
calcru: negative time of 0 usec for pid 21261 (sh)
calcru: negative time of 0 usec for pid 22260 (sh)
calcru: negative time of 0 usec for pid 22260 (sh)
calcru: negative time of 0 usec for pid 22560 (sh)
calcru: negative time of 0 usec for pid 22560 (sh)
calcru: negative time of 0 usec for pid 29257 (sh)
calcru: negative time of 0 usec for pid 29257 (sh)
calcru: negative time of 0 usec for pid 45341 (sh)
calcru: negative time of 0 usec for pid 45341 (sh)
calcru: negative time of 3917 usec for pid 49504 (sh)
calcru: negative time of 3917 usec for pid 49504 (sh)
calcru: negative time of 0 usec for pid 55558 (sh)
calcru: negative time of 0 usec for pid 55558 (sh)
calcru: negative time of 0 usec for pid 60591 (sh)
calcru: negative time of 0 usec for pid 60591 (sh)
calcru: negative time of 0 usec for pid 62769 (sh)
calcru: negative time of 0 usec for pid 62769 (sh)
calcru: negative time of 0 usec for pid 75079 (sh)
calcru: negative time of 0 usec for pid 75079 (sh)
calcru: negative time of 0 usec for pid 83060 (sh)
calcru: negative time of 0 usec for pid 83060 (sh)
calcru: negative time of 0 usec for pid 85556 (sh)
calcru: negative time of 0 usec for pid 85556 (sh)
calcru: negative time of 0 usec for pid 94309 (sh)
calcru: negative time of 0 usec for pid 94309 (sh)
calcru: negative time of 0 usec for pid 13370 (sh)
calcru: negative time of 0 usec for pid 13370 (sh)
calcru: negative time of 0 usec for pid 27636 (sh)
calcru: negative time of 0 usec for pid 27636 (sh)
calcru: negative time of 4211 usec for pid 36727 (sh)
calcru: negative time of 4211 usec for pid 36727 (sh)
calcru: negative time of 0 usec for pid 40010 (sh)
calcru: negative time of 0 usec for pid 40010 (sh)
calcru: negative time of 0 usec for pid 54561 (sh)
calcru: negative time of 0 usec for pid 54561 (sh)
calcru: negative time of 9398 usec for pid 59554 (sed)
calcru: negative time of 9398 usec for pid 59554 (sed)
calcru: negative time of 4094 usec for pid 60986 (sh)
calcru: negative time of 4094 usec for pid 60986 (sh)
calcru: negative time of 0 usec for pid 61839 (sh)
calcru: negative time of 0 usec for pid 61839 (sh)
calcru: negative time of 4154 usec for pid 66500 (sh)
calcru: negative time of 4154 usec for pid 66500 (sh)
calcru: negative time of 0 usec for pid 70950 (sh)
calcru: negative time of 0 usec for pid 70950 (sh)
calcru: negative time of 4175 usec for pid 88089 (sh)
calcru: negative time of 4175 usec for pid 88089 (sh)