FreeBSD 8.2 and MPD5 stability issues

[Adrian Minta]

After recompilation with "*default release=cvs tag=RELENG_8" and pooling
disables the system still crashes around 4200 sessions. The server has a
xeon E5520 CPU and 4G of ram. Here is the crash on the screen:
http://img232.imageshack.us/img232/6751/crashm.png

$uname -a
FreeBSD lns 8.2-STABLE FreeBSD 8.2-STABLE #2: Sat Jun 25 23:50:06 EEST
2011     gygy at lns:/usr/obj/usr/src/sys/MYKERNELv3  amd64

/boot/loader.conf:

net.graph.maxdata=65536
net.graph.maxalloc=65536
kern.ipc.maxpipekva=320000000
#I wave 4 cores
net.isr.bindthreads=4
net.isr.maxthreads=1
net.isr.defaultqlimit=4096

/etc/sysctl.conf:

net.inet.ip.forwarding=1
kern.maxfiles=65535
net.inet.ip.intr_queue_maxlen=8192
net.inet.icmp.icmplim=0
kern.ipc.nmbclusters=1280000
kern.ipc.maxsockbuf=128000000
net.graph.maxdgram=10240000
net.graph.recvspace=10240000
kern.random.sys.harvest.ethernet=0
net.isr.direct=1
net.isr.direct_force=0


Kernel GENERIC plus:

#options DEVICE_POLLING
options HZ=1000
options NETGRAPH
options NETGRAPH_PPPOE
options NETGRAPH_SOCKET
options NETGRAPH_CISCO
options NETGRAPH_ECHO
options NETGRAPH_FRAME_RELAY
options NETGRAPH_HOLE
options NETGRAPH_KSOCKET
options NETGRAPH_LMI
options NETGRAPH_RFC1490
options NETGRAPH_TTY
options NETGRAPH_ASYNC
options NETGRAPH_BPF
options NETGRAPH_ETHER
options NETGRAPH_IFACE
options NETGRAPH_L2TP
options NETGRAPH_MPPC_ENCRYPTION
options NETGRAPH_PPP
options NETGRAPH_PPTPGRE
options NETGRAPH_TEE
options NETGRAPH_UI
options NETGRAPH_VJC

options ALTQ
options ALTQ_CBQ
options ALTQ_RED
options ALTQ_RIO
options ALTQ_HFSC
options ALTQ_PRIQ
# options ALTQ_NOPCC

device pf
device pflog
device pfsync
device  gre

device          tap
device          hme

# Bridging
device          if_bridge
device          lagg

options         IPSTEALTH
options         ZERO_COPY_SOCKETS

options         NETGRAPH_DEBUG
options         GDB
options         DDB
options         KDB_UNATTENDED