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The next-hop address did not get updated in the routing table in case an entry for the destination already existed. This patch resolves the issue by removing the entry and having it re-created from scratch. The issue causes a routing error triggering reconstruction of the DODAG through version increase. In case of somewhat frequent downward traffic in not (yet) stabilized DODAG a vicious circle is formed: unstable topology means churn, downward routing under churn causes reconstruction of DODAG. In this situation the network does not have chance to stabilize. We encountered a constant churn caused by this bug in a network of 50 nodes and a periodic traffic (a packet every 5 seconds) generated at the root. More info and a PCAP demonstrating the issue can be found here: https://github.com/contiki-os/contiki/issues/496
The Contiki Operating System
Contiki is an open source operating system that runs on tiny low-power microcontrollers and makes it possible to develop applications that make efficient use of the hardware while providing standardized low-power wireless communication for a range of hardware platforms.
Contiki is used in numerous commercial and non-commercial systems, such as city sound monitoring, street lights, networked electrical power meters, industrial monitoring, radiation monitoring, construction site monitoring, alarm systems, remote house monitoring, and so on.
For more information, see the Contiki website: