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Cisco Bug: CSCup41321 - USD crash collection statistics interacts with nsusd, when NSUSD is busy

Last Modified

Sep 27, 2018

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases


Description (partial)

under very rare circumstances, when the cpu is busy, module can get reloaded.

You can expect to see the following output within show tech:

this happens very rarely when one of the process (USD) is busy and times out a request from another process  (collecting statistics) for a particular message.

One possible condition for this would be issuing the show cmd show queuing interface but this is not to be understood as everytime this cmd issued, this problem would occur. Nor is it true that for this problem to happen, the show cmd has to be issued.

Any actions that lead to interacting with USD process when it is busy and it involves handling request from another process (collecting statistics), the odds of this happening is very high.

`show cores`
VDC  Module  Instance  Process-name     PID       Date(Year-Month-Day Time)
---  ------  --------  ---------------  --------  -------------------------
1    1       1         nsusd            5875      2015-03-24 08:45:18

`show system reset-reason`
----- reset reason for module 1 (from Supervisor in slot 1) ---
1) At 66007 usecs after Tue Mar 24 08:45:22 2015
    Reason: Reset Requested due to Fatal Module Error
    Service: System manager
    Version: 6.1(2)I2(2)

Within show ver, you can expect to see

  Reason: Reset Requested due to Fatal Module Error
  System version: 6.1(2)I2(2)
  Service: System manager
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