From owner-freebsd-hackers@FreeBSD.ORG  Wed Jun 29 05:26:16 2011
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Date: Tue, 28 Jun 2011 22:09:40 -0700
From: perryh@pluto.rain.com
To: yuri@rawbw.com
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Cc: freebsd-hackers@freebsd.org, babkin@verizon.net, jhell@DataIX.net
Subject: Re: How can process in STOP state consume 200% CPU?
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Yuri <yuri@rawbw.com> wrote:

> On 06/28/2011 17:24, Sergey Babkin wrote:
> > Most probably the process is running in an endless loop in the
> > kernel mode ...  While it's in the kernel mode, you can't do
> > anything to it other than use the kernel debugger.
>
> How is this normally possible to make program to loop in kernel
> mode on -STABLE kernel?  Doesn't this mean bug in kernel?

In kernel code, but not necessarily in the -STABLE kernel itself --
there could be a problem in a kernel module.  I haven't checked, but
would not be surprised if VirtualBox included one.