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Cisco Bug: CSCvi03924 - Nyquist: FED:possible memory leak in fed_l2bcast_vlan_phy_port_add

Last Modified

Nov 29, 2019

Products (1)

  • Cisco Catalyst 9300 Series Switches

Known Affected Releases

16.6.2

Description (partial)

Symptom:
A Cisco device running an affected version may experience a kernel level memory leak in the "fed main event" process. 
This issue was first noticed on a Catalyst 9300 running IOS XE 16.6.3 version. 

The leak can be verified as follows: 

1) Collect periodically the output of the command "show processes memory platform sorted" and check whether the "Total" counter increases over time for "fed main event" 

Example outputs: 

switch#show processes memory platform sorted
System memory: 7713164K total, 7165888K used, 547276K free,
Lowest: 547276K
   Pid    Text      Data   Stack   Dynamic       RSS     Total              Name  
--------------------------------------------------------------------------------
 28321      85   4862248     136     74336   4862248   7832824    fed main event  
 13675  160324   1147572     136       124   1147572   3936532   linux_iosd-imag  
 24132     187     52708     136      2032     52708   1722140           sif_mgr  
 

switch#show processes memory platform sorted
System memory: 7713164K total, 7183692K used, 529472K free,
Lowest: 529472K
   Pid    Text      Data   Stack   Dynamic       RSS     Total              Name
--------------------------------------------------------------------------------
28321      85   4976628     136     74336   4976628   7963896    fed main event <<<<< 
13675  160324   1111960     136       124   1111960   3946108   linux_iosd-imag
24132     187     35268     136      2032     35268   1722140           sif_mgr

The following message will be logged when memory reaches its high level threshold:
%PLATFORM-4-ELEMENT_WARNING: Switch 1 R0/0: smand:  1/RP/0: Used Memory value 93% exceeds warning level 90%

If the above behavior is noticed, please contact Cisco TAC for further analysis.

Conditions:
None for the moment.
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