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Cisco Bug: CSCvh64302 - 9300 Mixed stack crashed when sending traffic

Last Modified

Aug 21, 2019

Products (1)

  • Cisco Catalyst 9300 Series Switches

Known Affected Releases

16.6.3 16.8.1

Description (partial)

Symptom:
Switch crash due to lack of memory:
*Jan 18 16:37:07.833 PST: %SYS-2-MALLOCFAIL: Memory allocation of ... bytes failed 
Pool: Processor  Free: ...  Cause: Memory fragmentation 
Alternate Pool: None  Free: 0  Cause: No Alternate pool 

consumed by NGWC Learning Process, e.g:

#show processes memory sorted
Processor Pool Total:  889007560 Used:  457435344 Free:  431572216
 lsmpi_io Pool Total:    6295128 Used:    6294296 Free:        832

 PID TTY  Allocated      Freed    Holding    Getbufs    Retbufs Process
   0   0  332944392   56372432  255724808          0          0 *Init*
  97   0 492949734160 333753398424  124673528 91930984944          0 NGWC Learning Pr <-------- high memory usage that continuously grow leading to memory depletion / device crash. 

Conditions:
high rate of MAC events (e.g. flapping) on Cat3k/Cat9k
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