Field Notice: FN - 63288 - "show tech" or "show hardware internal stats" May Lead to Switchover on Supervisor 2 Module Due to Kernel Panic, Run Alternate Patch Before Running Show tech or Upgrade Software

NOTICE:

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Revision History

Products Affected

Problem Description

Executing any of the following commands on a MDS switch or collecting the same information via Fabric Manager may cause a kernel panic on the supervisor:

This issue is only applicable to switches with Supervisor 2 in MDS9506, MDS9509 or MDS9513 chassis. In a dual supervisor switch this will force a supervisor switchover. In single supervisor systems the switch will reload.

Issuing the commands in succession on a dual supervisor switch will cause a switch reload if the command is executed the second time before it is in a ha-standby state.

Background

The kernel panic is caused by running either of the following statistics commands:


show hardware internal mgmt0 stats
show hardware internal eobc stats


This issue only affects removable supervisor 2 modules.

Problem Symptoms

In a dual supervisor switch this will force a supervisor switchover. In single supervisor systems the switch will reload.

Workaround/Solution

Refrain from using "show hardware internal mgmt0 stats" and "show hardware internal eobc stats".

Before running "show tech-support", "show tech-support details" or "tac-pac" (from FM/DM or CLI), load a plugin (available at www.cisco.com) which will patch the offending commands. The plug-in should be loaded on the standby supervisor also. The plug-in is not persistent across switchovers and should be loaded any time a switchover occurs.

Upgrade to one of the following software releases when it becomes available.

3.3(4a) or above
4.2(3) or above

Using the Debug Plug-in
Commands to issue are in italics.

1. Download the plug in from the Cisco Software Download Center: http://tools.cisco.com/support/downloads/go/Redirect.x?mdfid=282764109 and select release "1.0"
   
   
2. Make a copy of the downloaded gplug
   copy bootflash:m9500-sup2-showtech-FN63288-plugin-1.0.bin bootflash:gplug_copy
   
   
3. Copy the copy of the gplug to standby supervisor as well
   copy bootflash:gplug_copy bootflash://sup-remote/
   
   
4. Load the gplug on active supervisor
   load bootflash:gplug_copy
   
   
5. Attach to standby supervisor
   attach module <standby-sup-slot>
   
   
6. Load gplug on standby supervisor
   load bootflash:gplug_copy

DDTS

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For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

• Open a service request on Cisco.com
• By email
• By telephone

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