ruben @ gloin [~/crash/0]$ cat info.0
Dump header from device /dev/ad4s1b
  Architecture: i386
  Architecture Version: 1
  Dump Length: 97280B (0 MB)
  Blocksize: 512
  Dumptime: Sun May 22 08:29:28 2011
  Hostname: ************
  Magic: FreeBSD Text Dump
  Version String: FreeBSD 8.1-RELEASE-p3 #1: Fri May 20 16:50:47 EDT 2011
    sullrich@FreeBSD_8.0_pfSense_2.0-snaps.pfsense.org:/usr/obj.pfSense/usr/pfSensesrc/src/sys/pfSense_SMP.8
  Panic String: sbsndptr: sockbuf 0xc6e4a758 and mbuf 0xc6b17d00 clashing
  Dump Parity: 176355353
  Bounds: 0
  Dump Status: good
ruben @ gloin [~/crash/0]$ cat panic.txt
sbsndptr: sockbuf 0xc6e4a758 and mbuf 0xc6b17d00 clashing
ruben @ gloin [~/crash/0]$ cat version.txt
FreeBSD 8.1-RELEASE-p3 #1: Fri May 20 16:50:47 EDT 2011
    sullrich@FreeBSD_8.0_pfSense_2.0-snaps.pfsense.org:/usr/obj.pfSense/usr/pfSensesrc/src/sys/pfSense_SMP.8
ruben @ gloin [~/crash/0]$

From ddb.txt:

db:0:kdb.enter.panic>  run lockinfo
db:1:lockinfo> show locks
No such command
db:1:locks>  show alllocks
No such command
db:1:alllocks>  show lockedvnods
Locked vnodes
db:0:kdb.enter.panic>  show pcpu
cpuid        = 0
dynamic pcpu    = 0x53a400
curthread    = 0xc66fe500: pid 44066 "lighttpd"
curpcb       = 0xee97cd90
fpcurthread  = 0xc66fe500: pid 44066 "lighttpd"
idlethread   = 0xc5d8f280: pid 11 "idle: cpu0"
APIC ID      = 0
currentldt   = 0x50
db:0:kdb.enter.panic>  bt
Tracing pid 44066 tid 64138 td 0xc66fe500
kdb_enter(c0ecab67,c0ecab67,c0ed002c,ee97ca1c,0,...) at kdb_enter+0x3a
panic(c0ed002c,c0e3c5e4,c6e4a758,c6b17d00,c796b4f0,...) at panic+0x136
sbsndptr(c6e4a758,254,d4,ee97cad0,0,...) at sbsndptr+0xaa
tcp_output(c796b4f0,c6b17d00,6a,ee97cc58,1,...) at tcp_output+0xcc4
tcp_usr_send(c6e4a670,0,c6b17d00,0,0,...) at tcp_usr_send+0x28a
sosend_generic(c6e4a670,0,ee97cc58,c6b17d00,0,...) at sosend_generic+0x645
sosend(c6e4a670,0,ee97cc58,0,0,...) at sosend+0x3f
soo_write(c6737268,ee97cc58,c5d8a400,0,c66fe500,...) at soo_write+0x63
dofilewrite(ee97cc58,ffffffff,ffffffff,0,c6737268,...) at dofilewrite+0x97
kern_writev(c66fe500,11,ee97cc58,ee97cc78,1,...) at kern_writev+0x58
write(c66fe500,ee97ccf8,16,c66fe500,ee97cd2c,...) at write+0x4f
syscall(ee97cd38) at syscall+0x2d3
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (4, FreeBSD ELF32, write), eip = 0x28389573, esp = 0xbfbfe4bc, ebp = 0xbfbfe4d8 ---