[c-nsp] 7140 crashed

[cisco-nsp at crimea.net]

Hello,

We use 7140 as LNS for PPPoE (11 tunnels, about 800 sessions). 
Yesterday the box crashed with the error below. 
How can I determine why it crashed?

Cisco Internetwork Operating System Software 
IOS (tm) EGR Software (C7100-IS-M), Version 12.3(9), RELEASE SOFTWARE (fc2)
Copyright (c) 1986-2004 by cisco Systems, Inc.
Compiled Fri 14-May-04 16:32 by dchih
Image text-base: 0x60008AF4, data-base: 0x6206E000

ROM: System Bootstrap, Version 12.0(5r)XE, RELEASE SOFTWARE (fc1)
BOOTLDR: EGR Software (C7100-BOOT-M), Version 12.1(21), RELEASE SOFTWARE (fc1)
 
lns1 uptime is 16 hours, 16 minutes
System returned to ROM by error - a Software forced crash, PC 0x6064914C at 15:17:34 EST Mon Dec 6 2004
System restarted at 15:18:49 EST Mon Dec 6 2004
System image file is "tftp://aa.bb.cc.dd/c7100-is-mz.123-9.bin"
 
cisco 7140-2FE (EGR) processor (revision A) with 229376K/98304K bytes of memory.
Processor board ID 12701617
R7000 CPU at 262MHz, Implementation 39, Rev 1.0, 256KB L2, 2048KB L3 Cache
Last reset from power-on
Bridging software.
X.25 software, Version 3.0.0.
2 FastEthernet/IEEE 802.3 interface(s)
125K bytes of non-volatile configuration memory.
 
8192K bytes of Flash internal SIMM (Sector size 256K).
Configuration register is 0x2102