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Cisco Bug: CSCuo32189 - Running invalid on-demand SLA operation causes cfmd CPU spin

Last Modified

Aug 07, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

4.0.0.BASE

Description (partial)

Symptoms: 
After issuing the invalid request, the cfmd process on the source LC will consume high CPU for a 
prolonged period and the results of the operation may not be display - instead a timeout error will 
be seen. Additionally, CFM will not react to timeouts/errors during the CPU spin.

In some cases, an abnormal restart of cfmd may be seen on the source LC with a stack trace 
matching the decoded traceback attached to this DDTS.

Conditions:
The bug is only triggered in the case where an on-demand operation is scheduled with a duration 
which is shorter than the time between packets/bursts - e.g.

ethernet sla on-demand operation type cfm-delay-measurement probe send packet every 1 
minutes domain dom1 source interface GigabitEthernet 0/0/0/0.2 target mac-address a.b.c 
schedule in 30 seconds for 30 seconds

The key part is, for "send packet every X ... schedule ... for Y" the issue will only be hit 
if Y is less than X. (i.e. in the above example, 30 seconds is less than 1 minute)
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
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