100% CPU usage with today's kernel

[walt <wa1ter@xxxxxxxxxxxxx>]

After a full buildworld/kernel/upgrade this morning
I noticed that top shows 100% User cpu usage with
normal idling load avg of .07 or so.

I see only the normal processes running and they
all show 0% cpu.  This is true even when booting
into single-user mode.

The kernel from 21 May does not do this, so I
don't think it's a userland problem.

Any ideas?