[c-nsp] 'show isis database' delayed crash on 15.0(1)M1

Bryan Fields Bryan at bryanfields.net
Sun Feb 7 14:04:32 EST 2010

On 2/7/2010 03:45, Łukasz Bromirski wrote:
> On 2010-02-07 02:55, Bryan Fields wrote:
>> I was trouble shooing my network today and found a nasty little bug when some
>> one does 'show isis database' from exec mode on C181X Software
>> (C181X-ADVIPSERVICESK9-M), Version 15.0(1)M1, IOS.
>> After issuing the command you get the output of it, and some time in the next
>> 30 sec the router crashes.
>> example:
>> LTRKAKHQR01-c1811w#sh isis database
> Hard to reproduce or something else is causing the crash, I just tried
> this on my farm of 9 different 18xx and no crash at all:
> c180x#sh ver | i IOS
> Cisco IOS Software, C180X Software (C180X-ADVENTERPRISEK9-M), Version
> 15.0(1)M, RELEASE SOFTWARE (fc2)

I'm running the 15.0(1)M1 Advanced IP services, which is a different IOS image.

> Some process is behaving badly, if the Check Heaps has a
> problem validating the alignments. Then it seems
> something writes some gibberish out of it's memory slice
> and then things start to fall down.

A multitasking os with out memory protection strikes once again!

> Open a case. Have it reproduced and then nailed down to some
> specific bug.

This is my personal network, I don't have a support contract on any of it.  I
like to demo the newer IOS on it for that reason.  Figured it was worth a shot
to ask over here, maybe some cisco engineer watches this or some one ran into
this before.

I would suspect not, as no one would run ISIS on this platform, as it's kinda
a half ass ISIS implementation to begin with.
Bryan Fields

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