Often repeated entry in iwtrace.log

System

What could this mean and why does it repeat roughly 60 times per SECOND (yes, 60 times a second, ~3600 times per minute):

Trying to delete non-existent vnode 0x.....

Dave

Current Environment(s):
(1) TS 6.5 on W2K3
(2) TS 6.1 SP1 on W2K3
By the way, I miss Unix terribly.