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Cisco Bug: CSCul98202 - ipv4_rib proc stuck in Mutex, ipv4_rib rib_ug_send_data error messages

Last Modified

Jul 20, 2018

Products (7)

  • Cisco Carrier Routing System
  • Cisco ASR 9922 Router
  • Cisco IOS XR Software
  • Cisco ASR 9010 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases

4.3.3.BASE

Description (partial) 

Symptom:
Rib process appears to be blocked, causing issues with bcdl download and client update.
rib_ug_send_data error messages are seen on console.

Conditions:
** THIS ISSUE  CAN ONLY HAPPEN IF BGP-RIB FEEDBACK FEATURE IS ENABLED***

When BGP-RIB feedback is enabled, BGP inserts a feedback cookie into a batch
or routing updates. As RIB downloads each batch to FIB, it returns the associated 
feedback cookie to BGP. 

The feedback cookie at the head of the list can be accidentally free'd causing 
the remaining and newly added cookies in the list to be blocked. Each cookie has
a timer associated with it. The increasing number of timers being processed 
and rearmed every few ms eventually overwhelms rib process.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
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