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Cisco Bug: CSCua86731 - NXOS kernel memory leak in klm_pss

Last Modified

Jun 15, 2020

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

6.1(0.293)S7

Description (partial)

Symptom:
Nexus 7k running release 6.1.1 or earlier susceptible to kernel memory leak due to klm_pss allocating large amount of memory

Conditions:
N7k running release 6.1.1

To calculate the CURRENT kernel memory, use the following procedure:
N7K# show system internal kernel memory usage | in Low

Low memory condition is logged when the following formula is at/above the logging threshold:
(LowTotal - LowFree) รท LowTotal x 100 

eg:
1604_09hs
n7k# sh system internal kernel meminfo 
LowTotal:       713672 kB
LowFree:         66628 kB
=90.66%

1604_12hs

n7k# sh system internal kernel meminfo 
LowTotal:       713672 kB
LowFree:         66460 kB
=90.68%

1604_15hs
n7k# sh system internal kernel meminfo 
LowTotal:       713672 kB
LowFree:         66204 kB
=90.72%

If memory goes so high, check the output of show system internal kernel malloc-stats to see memory getting allocated to klm_pss and compare a number of outputs to confirm the same.
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