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Cisco Bug: CSCup89513 - Router crash at dual_routeupdate

Last Modified

Sep 14, 2019

Products (84)

  • Cisco IOS
  • Cisco 819 Hardened Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 888W Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco 812 CiFi Integrated Services Router
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Known Affected Releases

15.4(2)T1 15.5(0.13)S

Description (partial)

Router crash in "EIGRP-IPv4 " process.

Timing issue.

Usual Scenario once PFR is installed will be
P, 1 successors, FD is 2560000, tag is 7000, serno 2322
        via (2560000/0), GigabitEthernet0/1
        via (2818816/2818560), GigabitEthernet0/2
        via (2823680/2818560), GigabitEthernet0/1

Pre condtions where PFR installed route is not best route.
        via  (1538560/28160),   InterfaceX
        via (2560000/0), Interface Y ----- PFR Route not the best metric
        via (2823680/2818560),  ---- PARENT ROUTE InterfaceY

With above preconditions, if Route is lost from concerned neighbor on Interface Y, there is chance EIGRP function calls itself in form of nested call from PFR, If parent route is deleted followed by PFR route, Access to freed memory seen while accessing path of EIGRP, resulting in crash.
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