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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