panic: rtqkill route really not free on freebsd 8.0-release update

Hi, all

We add kdb/ddb and extra panic info printing into kernel and catch this  
panic again.

We have instrumented the kernel and found that this panic happens when  
draining == 1,
but seems to be confused with the fact that all access to radix trees are  
protected
by locks.  Can anyone familiar with these code shed us some light on this?

below is url to screenshot in ddb:
http://www.delphij.net/zhao/1.png
http://www.delphij.net/zhao/2.png

-- 
The Power to Serve
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