-BETA6 panic with xorp multicast routing daemon

Hi,
I got my -BETA6 panic when run xorp routing daemon.
Panic: mutex Giant not owned at /usr/src/sys/netinet/ip_mroute.c:2672

I've included:
options MROUTING
options PIM
for multicast purpose and:

options         KDB
options         KDB_TRACE
options         DDB                     #Enable the kernel debugger
options         DDB_NUMSYM
options         GDB

for debugging. but my box didnt save core to /var/crash.
any suggestions ?




thanks !

-dikshie-