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Cisco Bug: CSCur09682 - Router crashes in PIM due to infinite recursion at ip_set_mdb_flag

Last Modified

Aug 14, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

15.3(1)S1.10

Description (partial)

Symptom:
A router may reload unexpectedly due to a segmentation fault in the PIM process.
This is caused due to infinite recusrsion.

Conditions:
This was observed on a PE ASR1002 running 15.3(1)S2. It occurred after a route-map was applied to a CE router to block advertised prefixes.

The issue was reported for the Auto_RP Discovery Group 224.0.1.40 operating in Dense mode.
However the source  for this group is reachable via two VRF's. 
 
When the ACL was applied on CE, this prefix was probably blocked hence its reachability information changed, 
 
This change triggered a special check used for extranet scenario in our code, which led to the infinite recursion.
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