Strange ftpd log message

[Charlie Root <root%whooppee.com@localhost>]

I'm regularly getting messages similar to the following in by ftpd log 
(/var/log/xferlog):

        Aug 25 10:00:34 quicky ftpd[29069]: -1.998u 0.017s 0+0io 0pf+0w

Yep, it's reporting _negative_ user-mode usage!

It doesn't happen all the time, but it is frequent, and almost always 
it's in the same order of magnitude (ie, about -2 seconds).

Any clue?

If it matters, this is on a dual-core amd64 system, running -current as 
of a couple weeks ago.

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