Blade switch 3120 Crash

[edmond.chiu]

One of my blade switch 3120 running version 122-50.SE3    crashed and recorded the following erroe message:

System returned to ROM by bus error at PC 0x5B5EA78, address 0x0

Can someone help to find the root cause of the crash?

Many thanks

[Leo Laohoo]

12.2(50)SE3

I wouldn't be using this IOS version.

The "sh tech" didn't give me much information.  If the blade crashed then there should be some crashinfo files/folder.  Attached the latest 3. 

[Ivan Shirshin · Accepted solution]

Hi,

From the "show stacks" it seems to be an error on accessing specific memory address 0x0:

Using flash:/crashinfo/crashinfo_1.
Cisco IOS Software, CBS31X0 Software (CBS31X0-UNIVERSAL-M), Version 12.2(50)SE3, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Wed 22-Jul-09 09:10 by prod_rel_team

Instruction Access Exception (0x0400)!

Since 0x0 is a valid address in "main" region, the error likely to be a parity problem. The mostly meaningless stack trace corresponds with such root cause.

------------------ show region ------------------

Region Manager:

      Start         End     Size(b)  Class  Media  Name
 0x00000000  0x0FFFFFFF   268435456  Local  R/W    main

Parity errors are related to HW problems and with first occurrence it is recommended to monitor the blade.

1. https://www.cisco.com/en/US/products/hw/routers/ps341/products_tech_note09186a0080094793.shtml
2. http://www.cisco.com/en/US/products/hw/routers/ps167/products_tech_note09186a0080094340.shtml

At the same time, I suggest to check extended crashinfo for more symptoms.

------------------ show flash: ------------------

Directory of flash:/

    3  drwx         512   Jan 6 2013 06:59:18 +08:00  crashinfo_ext

Kind Regards,
Ivan Shirshin

**Please grade this post if you find it useful.