rtfree: 0xc3e377f8 has 1 refs

Hi list,

While experimenting with IPv6 on a spare server, I noticed the following 
in the logs:

Sep  2 00:24:33 deserteagle kernel: rtfree: 0xc3e377f8 has 1 refs
Sep  2 00:25:01 deserteagle last message repeated 139 times
Sep  2 00:25:01 deserteagle kernel: rtfree: 0xc3e377f8 has 1 refs
Sep  2 00:25:17 deserteagle last message repeated 401 times
Sep  2 00:27:38 deserteagle last message repeated 1204 times
Sep  2 00:35:32 deserteagle last message repeated 1032 times
Sep  2 00:47:03 deserteagle last message repeated 164 times


Connectivity is fine, but these messages are filling up the logs. The 
only traffic that particular server gets right now is ssh (over ipv6, 
altough by looking at the logs the messages show up even before I login)


uname:
7.0-CURRENT FreeBSD 7.0-CURRENT #2: Sat Sep  1 23:07:18 UTC 2007     
klr_at_deserteagle.barafranca.com:/usr/obj/usr/src/sys/DESERTEAGLE  i386


netstat -rn:
Internet6:
Destination                       Gateway                       
Flags      Netif Expire
::/96                             ::1                           
UGRS        lo0 =>
default                           2002:c058:6301::              
UGS        stf0
::1                               ::1                           
UHL         lo0
::ffff:0.0.0.0/96                 ::1                           
UGRS        lo0
2002::/24                         ::1                           
UGRS        lo0 =>
2002::/16                         2002:4655:c4f2::1             
U          stf0
2002:4655:c4f2::/48               link#1                        
UC          em0
2002:4655:c4f2::1                 link#4                        
UHL         lo0
2002:4655:c4f2::ac1d:242          00:0c:f1:bf:2a:54             
UHL         lo0
2002:4655:c4f2::ac1d:243          00:0c:f1:bf:2a:54             
UHL         lo0
2002:7f00::/24                    ::1                           
UGRS        lo0
2002:e000::/20                    ::1                           
UGRS        lo0
2002:ff00::/24                    ::1                           
UGRS        lo0
fe80::/10                         ::1                           
UGRS        lo0
fe80::%em0/64                     link#1                        
UC          em0
fe80::20c:f1ff:febf:2a54%em0      00:0c:f1:bf:2a:54             
UHL         lo0
fe80::%lo0/64                     fe80::1%lo0                   
U           lo0
fe80::1%lo0                       link#3                        
UHL         lo0
ff01:1::/32                       link#1                        
UC          em0
ff01:3::/32                       ::1                           
UC          lo0
ff02::/16                         ::1                           
UGRS        lo0
ff02::%em0/32                     link#1                        
UC          em0
ff02::%lo0/32                     ::1                           
UC          lo0



I have never seen this error before. On a 6.2-RELEASE-p1 box at home 
(which also got ipv6 connectivity) I do not see these errors.

Ideas?

Best regards,

Hugo