[c-nsp] Spurious Memory Access and Traceback

[Rodney Dunn]

On Mon, Aug 09, 2004 at 02:21:06PM +0000, rwcrowe at comcast.net wrote:
> Looking through some logs I see a 2620 logged the following error messages:
> 
> Jul  9 19:32:01.716 EST: %ALIGN-3-SPURIOUS: Spurious memory access made at 0x805834D4 reading 0x8
> Jul  9 19:32:01.716 EST: %ALIGN-3-TRACE: -Traceback= 805834D4 80393650 803D5820 803D497C 803D5820 803E6F74 8048B5A0 8048EAE8
> 
> A "show alignment" provides the following:
> Alignment data for:
> C2600 Software (C2600-I-M), Version 12.3(9), RELEASE SOFTWARE (fc2)
> Compiled Fri 14-May-04 14:37 by dchih
> Total Spurious Accesses 15, Recorded 3
>  Address  Count  Traceback
>        8      7  0x805834D4 0x80393650 0x803D5820 0x803E6F74 0x8048B5A0 0x8048EA
> E8
>        8      7  0x805834D4 0x80580C78 0x803D5820 0x803E6F74 0x8048B5A0 0x8048EA
> E8
>        8      1  0x805834D4 0x80393650 0x803D5820 0x803D497C 0x803D5820 0x803E6F
> 74 0x8048B5A0 0x8048EAE8
> This is an edge 2620 running 12.3(9), 32MB DRAM, 16MB Flash, nothing special running on it. It did not reboot from the error, just curious on the internals of this error. From what I understand on tracebacks, this is just an internal memory error in IOS. Maybe tried to access a memory address in use or a non-existant one. Any input ?

It's an access to a low memory address.

8 to be exact.

The number of times it's hit the error has been pretty small.
7

It's a software bug.  Open a TAC case on it.

Almost never do these cause enough CPU overhead doing the corrections
to impact performance but I have seen it happen.
You'd see the CPU high at interrupt level.

You are most likely hitting:

CSCee66832
Internally found severe defect: Resolved (R)
sh ip access-list doesnt show configured extended access-list

fixed in 12.3(9.8) code.

It was a result of a show command you entered and the code was broken
printing the output.

Please open a TAC case so they can link your case to the bug for
tracking purposes.

Rodney


> --
> Rob Crowe 
> rwcrowe at comcast.net
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