Symptom
A crash is triggered by the Dynamic Domain Name Server (DDNS or DynDNS) feature.
The crash report points to a memory segmentation fault by the process:
UNIX-EXT-SIGNAL: Segmentation fault(11), Process = Dyn DNS Client
Conditions
DynDNS has to be configured, any of these examples is applicable:
!
ip ddns update method testing
ddns
interface EthernetX
ip dhcp client update dns
ip ddns update testing
ip address dhcp
end
!
ip dhcp pool test
network IP MASK
update dns
!
Further information on how is DDNS configured on Cisco devices:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dns/configuration/15-mt/dns-15-mt-book/dns-dyn-dns-supp-ios.html#GUID-89BCB212-EE5C-40D9-AEF5-B18DDB5D5758
Workaround
Disabling DDNS will mitigate this issue
Further Problem Description
The ultimate fix comes through CSCvw84883.
