[c-nsp] Continued SegV exception On 7206 LNS

[Dominic]

My Cisco 7206VXR with NPE-G2 runs as an LNS terminating PPPOE sessions. It also terminates a DS3 used for data T1s. About once a week or so,  a SegV exception happens, and the router resets itself. I have no idear why. 

The documentation says this is invariably a software error, and we have upgraded from c7200p-spservicesk9-mz.150-1.M.bin to c7200p-spservicesk9-mz.150-1.M3.bin, but he problem continues. There seems to be no pattern to it. Sometimes, it happens under heavy load. Sometimes, it happens under very little load in the middle of the night.  Sometimes, it happens once in two weeks. Sometimes, it happens thrice a day. Usage is still pretty decent, averaging at abotu 30%. 

Does anyone have an idea about what we should be looking at? Should we be using a different firmware altogether? Suggestions?

lns1-dsl#show version
Cisco IOS Software, 7200 Software (C7200P-SPSERVICESK9-M), Version 15.0(1)M3, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Sun 18-Jul-10 07:28 by prod_rel_team

ROM: System Bootstrap, Version 12.4(12.2r)T, RELEASE SOFTWARE (fc1)
BOOTLDR: Cisco IOS Software, 7200 Software (C7200P-KBOOT-M), Version 12.4(4)XD5, RELEASE SOFTWARE (fc1)

lns1-dsl uptime is 21 minutes
System returned to ROM by error - a SegV exception, PC 0x7420E8 at 11:17:36 edt Thu Oct 7 2010
System restarted at 11:19:41 edt Thu Oct 7 2010
System image file is "disk2:c7200p-spservicesk9-mz.150-1.M3.bin"



Dominic



  ----- Original Message ----- 
  From: Dominic 
  To: cisco-nsp at puck.nether.net 
  Sent: Tuesday, September 21, 2010 10:11 PM
  Subject: SegV exception On 7206 LNS


  Hi Everyone:



  show ver
  ...
  System returned to ROM by error - a SegV exception, PC 0x73FE74 at 14:34:13 edt Tue Sep 21 2010
  System restarted at 14:36:08 edt Tue Sep 21 2010
  System image file is "disk2:c7200p-spservicesk9-mz.150-1.M.bin"
  ...

  show stacks
  ...
   14:34:06 edt Tue Sep 21 2010: Unexpected exception to CPU: vector 300, PC = 0x73FE74  , LR = 0x73FDA4
  -Traceback= 0x73FE74z 0x73FDA4z 0x196B7C8z 0x11E74z 0x6883D0z 0x68BDB0z 0x6837B0z 0x66E140z 0x66BC08z 0x4D90000z 0x66E784z 0x66BCC4z 0x1939F4Cz 0x65BCE50z 0x1939B58z 0x1939F38z
  ..



  Dominic