can someone please let me know what this crash means?

[Jason]

Just had my server drop into debugger this morning after running for 78 days..
and heres what the trace said..

OPTIONS: History Buffer, F-key Macros, Search History Buffer, I18n 
Compiled on Dec  4 2004, 19:14:15.

Press CTRL-A Z for help on special keys
                                                                      
                                                                      
db> AT S7=45 S0=0 L1 V1 X4 &c1 E1 Q0                                  
No such command                                                       
db> trace                                                             
Tracing pid 608 tid 100103 td 0xc2688480
kdb_enter(c07ec00d) at kdb_enter+0x2b
panic(c07e8435,c07eb5f7,c07eb390,366,c299b434) at panic+0x127
mtx_destroy(c812457c,0) at mtx_destroy+0x5c
in_pcbdetach(c81244ec,c616e6f0,c616e6f0,14,e830db44) at in_pcbdetach+0x1b4
tcp_close(c616e6f0,1,0,14,c616e6f0) at tcp_close+0x94
tcp_input(c3e3b200,14,6da8d318,0,0) at tcp_input+0x16df
ip_input(c3e3b200) at ip_input+0x50d
div_output(c2728288,c3e3b200,c263b620,0,e830dc0c) at div_output+0x1f7
div_send(c2728288,0,c3e3b200,c263b620,0) at div_send+0x3f
sosend(c2728288,c263b620,e830dc40,c3e3b200,0) at sosend+0x5e7
kern_sendit(c2688480,3,e830dcbc,0,0) at kern_sendit+0x104
sendit(c2688480,3,e830dcbc,0,bfbeed98) at sendit+0x161
sendto(c2688480,e830dd04,6,6888be,292) at sendto+0x4d
syscall(2f,bfbf002f,e830002f,1,28) at syscall+0x227
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (133, FreeBSD ELF32, sendto), eip = 0x280d31cf, esp = 0xbfbeecdc, ebp = 
0xbfbfed88 ---
db> 

monsterjam jason $ uname -a
FreeBSD monsterjam.org 5.4-STABLE FreeBSD 5.4-STABLE #2: Fri Aug 26 15:15:59 EDT 2005     
monsterjam.org:/usr/src/sys/i386/compile/FREEBIE  i386


thanks/regards,
Jason