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Cisco Bug: CSCum88818 - Flapping VPN sessions may cause a QFP leak with 'CPP List Hdr Chunk'

Last Modified

Nov 08, 2019

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.3(3)S

Description (partial)

Symptom:
IOS-XE router may see a leak with cpp_cp_svr over time on the QFP. 

"show platform software process list <qfpslot> sort memory" will show growth with 'cpp_cp_svr':

Name                     Pid    PPid  Group Id  Status    Priority  Size        
------------------------------------------------------------------------------
linux_iosd-imag        30624   29810     30624  S               20  2577334272  
cpp_cp_svr              8026    7453      8026  S               20  2330619904  <<<<
fman_fp_image           9226    8789      9226  S               20  1626140672  
cpp_stats_svr           8606    8301      8606  S               20  883277824   
fman_rp                29235   28492     29235  S               20  855764992  

"show platform software memory qfp-control-process qfp active brief" will show memory on the QFP's client control processing service. Growth with the following 'CPP List Hdr Chunk' module will show overhead increasing between the number of allocations versus the frees:

Module: CPP List Hdr Chunk
  allocated: 979939766, requested: 979860006, overhead: 79760 <<
  Allocations: 5386, failed: 0, frees: 401

Conditions:
This leak can be triggered by flapping VPN sessions. It can apply to any VPN environment (flexvpn, dmvpn, etc). and is triggered by an internal condtion in which the list elements of the session are not freed properly
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