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Cisco Bug: CSCur21775 - STACKLOW error message results in unexpected reboot

Last Modified

Dec 03, 2018

Products (96)

  • Cisco IOS
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco 2951 Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco 888W Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 812 CiFi Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco 861W Integrated Services Router
  • Cisco 881SRSTW Integrated Services Router
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Known Affected Releases

15.3(3)M 15.4(3)M

Description (partial) 

Symptom:
On an ISR G2 router running 15.3(3)M1, the BGP Open process will start, and report that it is running out of stack space:

*Sep 22 12:59:48.587: %SYS-6-STACKLOW: Stack for process BGP Open running low, 20/6000
*Sep 22 13:00:48.591: %SYS-6-STACKLOW: Stack for process BGP Open running low, 20/6000
*Sep 22 13:03:49.103: %SYS-6-STACKLOW: Stack for process BGP Open running low, 24/6000
*Sep 22 13:03:49.103: %SYS-6-STACKLOW: Stack for process BGP Open running low, 24/6000

BGP Open will then shut down and restart, and continue displaying these errors.

Conditions:
If a process is running low on stack and gets killed, this issue could be seen.
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