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Cisco Bug: CSCvi83306 - Crash with IOSXE-WATCHDOG: Process = IPv6 RIB Event Handler

Last Modified

Jan 18, 2019

Products (8)

  • Cisco IOS
  • Cisco 4221 Integrated Services Router
  • Cisco 4321 Integrated Services Router
  • Cisco 4331 Integrated Services Router
  • Cisco 4431 Integrated Services Router
  • Cisco 4451-X Integrated Services Router
  • Cisco Cloud Services Router 1000V
  • Cisco 4351 Integrated Services Router

Known Affected Releases


Description (partial)

There are CPUHOG for IPv6 RIB Event Handler. Eventually, the router reload with a WATCHDOG timeout.

Feb 15 01:00:01.300 UTC: %SYS-3-CPUHOG: Task is running for (24522)msecs, more than (2000)msecs (0/0),process = IPv6 RIB Event Handler.
-Traceback= 1#979fbafb2ff8cd30741886a0f5eb9f29  iosd_shr_<m_uk9_CEFMPLS_crb:7F00D5D4F000+227310 :559AB589E000+72D19CB :559AB589E000+3C009AE :559AB589E000+3C2A2D7 :559AB589E000+3C2C293 :559AB589E000+3C2948F :559AB589E000+3C2C738 :559AB589E000+3BC3A3B :559AB589E000+3BD6709 :559AB589E000+3C4F87D :559AB589E000+3C4A5FA :559AB589E000+3DA14CF iosd_shr_m_uk9_IPV6_Core_crb:7F00D2D2B000+2FC12F iosd_shr_m_uk9_IPV6_Core_crb:7F00D2D2B000+2E5FD5

OCE traceback logs can be seen:

 %OCE-3-LOOP: A loop in the OCE chain has been detected at: 24055()[0x3EA64F28]
-Traceback= 1#18b28a597ef22b41c7070284ab06cbb2  :10000000+EC43D4 :10000000+EC4784 :10000000+B11298 :10000000+AC310C :10000000+B112B8 :10000000+567E5EC :10000000+B112B8 :10000000+AC310C :10000000+B112B8 :10000000+567E5EC :10000000+B112B8 :10000000+AC310C :10000000+B112B8 :10000000+567E5EC :10000000+B112B8 :10000000+AC310C

Customer has noticed the crash occurs when there is a primary link failure where BGP is forced to connect via an alternate default route.
They believe what causes the crash is an in VRF default pointing to the tunnel for the tunnel IP..recursion due to a default coming temporarily from the COLO (we use IP SLA to revoke the default from the COLO so the branch default takes over, but in the small amount of convergence time the routers crash).
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