Apply by doing:
cd /usr/src
patch -p0 < 005_pcb.patch
Then build and install a new kernel.
Index: sys/netinet/in_pcb.c
===================================================================
RCS file: /cvs/src/sys/netinet/in_pcb.c,v
retrieving revision 1.92
retrieving revision 1.92.2.1
diff -u -p -r1.92 -r1.92.2.1
--- sys/netinet/in_pcb.c 30 Dec 2007 21:13:27 -0000 1.92
+++ sys/netinet/in_pcb.c 30 Jul 2008 05:36:15 -0000 1.92.2.1
@@ -487,9 +487,10 @@ in_pcbdetach(v)
if (inp->inp_route.ro_rt)
rtfree(inp->inp_route.ro_rt);
#ifdef INET6
- if (inp->inp_flags & INP_IPV6)
+ if (inp->inp_flags & INP_IPV6) {
+ ip6_freepcbopts(inp->inp_outputopts6);
ip6_freemoptions(inp->inp_moptions6);
- else
+ } else
#endif
ip_freemoptions(inp->inp_moptions);
#ifdef IPSEC