In "Hang during shutdown", Dave Huang <khym@bga.com> wrote: 
> I first noticed this around 2 weeks ago, I think, and it happened to me 
> again last night... I did a shutdown -r now to reboot and my machine 
> seemed to hang while killing off all the processes (or maybe while 
> waiting for 'em to die or something). It only seems to happen if the 
> machine's been up for a while though (maybe over a day or so). I went 
> into ddb and got a stack trace, which showed functions in the VM system, 
> such as vm_object_collapse (I think). I was in a hurry to reboot, so I 
> didn't write down the trace.

I see the same thing.  It happens when killing lpd on my system(s).

The bug seems to be arch independent, since I can reproduce it on
NetBSD/Mac, and NetBSd/Sun3.

;-/

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