calcru: negative time of -582613 usec for pid 672 (sh)

Hi....

i get the following messages on my PII/266 with FreeBSD 5.2 / 5.2.1 / -current

   calcru: negative time of -582613 usec for pid 672 (sh)

these messages appear for each process and fills the log in a short time.

dmsg output attached

Thanx,
Jan