System received a Bus Error exception

One of my Cisco 3640 routers keep crashing lately, giving the following on the console--

-Traceback= 610561EC 610688F4 610484D4

*** System received a Bus Error exception *** signal= 0xa, code= 0xc, context= 0x61c87ab0 PC = 0x6043542c, Cause = 0x420, Status Reg = 0x34018002

A 'show region' is below:

Region Manager:

Start End Size(b) Class Media Name 0x03A00000 0x03FFFFFF 6291456 Iomem R/W iomem 0x30000000 0x30FFFFFF 16777216 Flash R/O flash 0x60000000 0x639FFFFF 60817408 Local R/W main 0x60008950 0x61155ABF 18141552 IText R/O main:text 0x61156000 0x61AE71DF 10031584 IData R/W main:data 0x61AE71E0 0x61D5151F 2532160 IBss R/W main:bss 0x61D51520 0x639FFFFF 30075616 Local R/W main:heap 0x80000000 0x839FFFFF 60817408 Local R/W main:(main_k0) 0xA0000000 0xA39FFFFF 60817408 Local R/W main:(main_k1)

Can someone please confirm what may be the cause of the problem? Thanks

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as Peter has said it is ahardware fault of some sort

see Cisco doc "Troubleshooting Bus Error Crashes"

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for some troubleshooting hints and procedures

If you have a SmartNet support contract for the unit, then open a case with the Cisco TAC

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The key is

This is indicative of a Hardware failure. I have seen something similar with an old 4700 Router, it would crash at random intervals, anything between 4 hours to 4 weeks of operation, regardles of any obvious operation. Replacing the router cured the problem.

Cisco H/W failures are not always common, but they do happen......;-)

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Post output of show version and show stack

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Also Cisco docs on troubleshooting bus errors also suggest trying to upgrade IOS software in the event the issue is osftware rleated

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Here they here, thanks. I know the IOS is old but we don't have support to get the upgrade and the router has been operating without issues for over 2 years.

------------------ show version ------------------

Cisco Internetwork Operating System Software IOS (tm) 3600 Software (C3640-IS-M), Version 12.2(1), RELEASE SOFTWARE (fc2) Copyright (c) 1986-2001 by cisco Systems, Inc. Compiled Fri 27-Apr-01 03:19 by cmong Image text-base: 0x60008950, data-base: 0x61156000

ROM: System Bootstrap, Version 11.1(20)AA2, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

uptime is 13 hours, 40 minutes System returned to ROM by bus error at PC 0x610561EC, address 0x1 System image file is "flash:c3640-is-mz.122-1.bin"

cisco 3640 (R4700) processor (revision 0x00) with 59392K/6144K bytes of memory. Processor board ID 26388688 R4700 CPU at 100Mhz, Implementation 33, Rev 1.0 Bridging software. X.25 software, Version 3.0.0. SuperLAT software (copyright 1990 by Meridian Technology Corp).

1 FastEthernet/IEEE 802.3 interface(s) 1 ATM network interface(s) DRAM configuration is 64 bits wide with parity disabled. 125K bytes of non-volatile configuration memory. 16384K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102

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

Minimum process stacks: Free/Size Name 5604/6000 DHCPD Receive 8116/12000 Init 5288/6000 RADIUS INITCONFIG 8720/12000 Virtual Exec

Interrupt level stacks: Level Called Unused/Size Name 1 40679547 7964/9000 Network interfaces 2 11608 8620/9000 DMA/Timer Interrupt 3 0 9000/9000 PA Management Int Handler 4 47 8616/9000 Console Uart 5 0 9000/9000 External Interrupt 7 12310505 8604/9000 NMI Interrupt Handler

System was restarted by bus error at PC 0x610561EC, address 0x1

3600 Software (C3640-IS-M), Version 12.2(1), RELEASE SOFTWARE (fc2) Compiled Fri 27-Apr-01 03:19 by cmong (current version) Image text-base: 0x60008950, data-base: 0x61156000

Stack trace from system failure: FP: 0x61E41358, RA: 0x610561EC FP: 0x61E413D0, RA: 0x610688F4 FP: 0x61E41408, RA: 0x610484D4

*************************************************** ******* Information of Last System Crash ********** ***************************************************
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System was restarted by bus error at PC 0x610561EC, address 0x1

the above message with an invalid memory address suggest that the issue is potentially a software bug.

Not that you software is old but it is the first release of 12.2

are all of your 3640's running the same release ?

You really should get a minimal support contract ( 8 x 5 NBD ) so you can upgrade the software

has anything changed in your environment lately in terms of volume or type of traffic that is hitting this box ?

Any config changes ?

do you have an OC3 ATM interface in the 3640 ???


The failure was caused by a software defect.Note that this is a bus error crash and can also be hardware related.Please read Troubleshooting Bus Error Crashes for more details,especially if no bug from the list seems to match your issue.

The stack trace decoded symbols are: rs8234_data_receive_complete rs8234_data_receive_complete rs8234_data_receive_complete atmoc3_rs8234_interrupt atmoc3_pm5346

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Are you experiencing a lot of errors of the ATM interfce

post show interface for the ATM interface

then clear counters and monitor

how many ATM PVC's are configured on interface ?

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Merv, thanks so much for your replies and insights. Much appreciate it.

Yea, all our 3640's are running the same IOS release. The one that's having issues does have an ATM interface that's connected via DS3 to a disaster recovery site. The config hasn't been changed, nor has traffic increased since it went live 2 years ago. I'll see if I can get the IOS upgraded.

Thanks again.

The partial show int is below:

ATM0/0 is up, line protocol is up Hardware is RS8234 ATM DS3 Internet address is x.x.x.x/30 MTU 4470 bytes, sub MTU 4470, BW 45000 Kbit, DLY 190 usec, reliability 255/255, txload 3/255, rxload 2/255 Encapsulation ATM, loopback not set Keepalive not supported Encapsulation(s): AAL5 1024 maximum active VCs, 1 current VCCs VC idle disconnect time: 300 seconds Last input 00:00:22, output 00:00:00, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops:

1041 Queueing strategy: Per VC Queueing 30 second input rate 362000 bits/sec, 148 packets/sec 30 second output rate 699000 bits/sec, 148 packets/sec 73141416 packets input, 4166298791 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 85323223 packets output, 265472058 bytes, 0 underruns 0 output errors, 0 collisions, 1 interface resets 0 output buffer failures, 0 output buffers swapped out

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