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Cisco Bug: CSCvu92688 - Cat9000: FED Memory Leak in 16.9.x due to Netflow

Last Modified

Sep 24, 2020

Products (1)

  • Cisco Catalyst 9300 Series Switches

Known Affected Releases

16.9.5

Description (partial)

Symptom:
++ We see Memory Leak happening in the "fed main event" process. 
The RSS/Total counters keep increasing over time in the below output:


Switch#show processes memory platform sorted
System memory: 7711588K total, 6886612K used, 824976K free,
Lowest: 824976K
   Pid    Text      Data   Stack   Dynamic       RSS     Total              Name
--------------------------------------------------------------------------------
 16433     145   4006780     136     85064   4006780   7059676    fed main event <----
 14490  144051    892456     136       296    892456   4632172   linux_iosd-imag
 14162     270     50604     136      2072     50604   1646600           sif_mgr
 14383     739     61548     136      1652     61548   1519636      platform_mgr
 23529    6710    122256     136      2916    122256   1461768           fman_rp


++ The following errors can be seen in the FED tracelogs:

Switch# show logging process fed start last boot

<snip>
2020/05/27 04:56:34.400 {fed_F0-0}{1}: [asic_fnf] [16453]: UUID: 0, ra: 0, TID: 0 (ERR): AFD-INFRA:FNF Failed to read flow table
2020/05/27 04:56:34.400 {fed_F0-0}{1}: [asic_nfl] [16453]: UUID: 0, ra: 0, TID: 0 (ERR): AFD-INFRA:NFL curr_fmask_entry is NULL! Mask-Id 2 Lut 1, asic 0

Conditions:
Catalyst 9000 switch with the same flow monitor configured on a port-channel and regular interface.
The switch is running the IOSXE image that already has the fix for similar bug tracked under CSCvs50868.
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