2621XM - Issue with SegV exception

Unanswered Question
Apr 24th, 2008
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Hi all,


I have one issue with my 2621XM router.


When a tried to insert "interface mfr" command, router just reloded and repported following error message:


System returned to ROM by error - a SegV exception, PC 0x80468584


Cisco says

ERROR: This router was restarted by a Segmentation Violation Exception (SegV). This is caused by a software related problem. The most common software issues that can cause a Segmentation Violation Exception are: - Access to an invalid memory address - Write access to a read-only memory region - A jump to an invalid PC (often 0x0)


I tried to software upgrade router but i have still same issue


I want to configure some MFR interfaces and frame-relay encapsulation.


Here follows some more details from sh tech:


Sh ver:

Cisco Internetwork Operating System Software

IOS (tm) C2600 Software (C2600-IS-M), Version 12.2(13)T, RELEASE SOFTWARE (fc1)

TAC Support: http://www.cisco.com/tac

Copyright (c) 1986-2002 by cisco Systems, Inc.

Compiled Sat 16-Nov-02 23:00 by ccai

Image text-base: 0x80008098, data-base: 0x8183511C


ROM: System Bootstrap, Version 12.2(7r) [cmong 7r], RELEASE SOFTWARE (fc1)


NO001550NROU01 uptime is 1 day, 20 hours, 49 minutes

System returned to ROM by error - a SegV exception, PC 0x80468584

System restarted at 18:28:11 SUM Tue Apr 15 2008

System image file is "flash:c2600-is-mz.122-13.T.bin"


cisco 2620XM (MPC860P) processor (revision 0x100) with 94208K/4096K bytes of mem ory.

Processor board ID JAE07300121 (364871735)

M860 processor: part number 5, mask 2

Bridging software.

X.25 software, Version 3.0.0.

1 FastEthernet/IEEE 802.3 interface(s)

2 Serial network interface(s)

32K bytes of non-volatile configuration memory.

32768K bytes of processor board System flash (Read/Write)


Configuration register is 0x2102





------------------ show stacks ------------------



Minimum process stacks:

Free/Size Name

5600/6000 SPAN Subsystem

2588/3000 allegro libretto init

8216/12000 Init

5440/6000 RADIUS INITCONFIG

8976/12000 Virtual Exec


Interrupt level stacks:

Level Called Unused/Size Name

1 47156100 8356/9000 Network interfaces

2 0 9000/9000 Timebase Reference Interrupt

3 0 9000/9000 PA Management Int Handler

6 4 8916/9000 16552 Con/Aux Interrupt

7 39886646 8920/9000 MPC860 TIMER INTERRUPT


System was restarted by error - a SegV exception, PC 0x80468584

C2600 Software (C2600-IS-M), Version 12.2(13)T, RELEASE SOFTWARE (fc1)

TAC Support: http://www.cisco.com/tac

Compiled Sat 16-Nov-02 23:00 by ccai

Image text-base: 0x80008098, data-base: 0x8183511C



Stack trace from system failure:

FP: 0x82C0D100, RA: 0x804691EC

FP: 0x82C0D118, RA: 0x80468758

FP: 0x82C0D138, RA: 0x803BEC54

FP: 0x82C0D168, RA: 0x815EAB54

FP: 0x82C0D190, RA: 0x815EADDC

FP: 0x82C0D1A0, RA: 0x815EC784

FP: 0x82C0D1C8, RA: 0x80942D80

FP: 0x82C0D200, RA: 0x8001C2B0

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Kevin Dorrell Thu, 04/24/2008 - 06:50
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A SegV exception can be almost anything, but almost invariably a bug. For example, I had one in my lab over the weekend due to an IPv6 access list that it did not like ... that was on 12.4(2)T, also on a 2611XM as it happens.


I found this in the bug database that might be relevant, but I don't know whether you have traffic shaping anywhere:


CSCdz38482 Bug Details Bug #3 of 6 | < Previous | Next >


Router crashes with SegV exception

Symptoms: A Cisco router that is configured for Multilink Frame Relay (MFR)

may reload when traffic shaping is enabled on an MFR interface.


Conditions: This symptom is observed only when one of the MFR bundle links is

configured after traffic shaping has been enabled.


Workaround: There is no workaround.


The only thing I can suggest is save the config to a file, clear down the config completely, configure the MFR first, then gradually introduce the rest of the config until you find the bit it is clashing with. That's the way I found my IPv6 access-list bug.


Kevin Dorrell

Luxembourg



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