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Cisco Bug: CSCuq25008 - Route/tunnel recursion leads to STACKLOW and crash

Last Modified

Jan 07, 2020

Products (95)

  • Cisco IOS
  • Cisco 1905 Serial Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco C897VA Integrated Services Router
  • Cisco 2951 Integrated Services Router
  • Cisco 812 CiFi Integrated Services Router
  • Cisco 898 Secure G.SHDSL EFM/ATM with Multi-Mode 4G LTE ISR Router
  • Cisco 819 Hardened Integrated Services Router
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Known Affected Releases

15.4(3)M

Description (partial)

Symptom:
A router may unexpectedly reload due to a stack overflow condition with the following error -

%SYS-6-STACKLOW: Stack for process TPLUS running low, 0/6000

Conditions:
The crash occurs when tunnel/route recursion is present. This problem has been seen when we learn a route to the tunnel endpoint across the tunnel. In conjunction with that, a static route is configured for a subnet which is routing across the multipoint tunnel and instead of defining the next-hop IP, the interface itself is used.
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