On Saturday, 28 December 2019 03:32:17 CET 张鹏 wrote:
Thank you very much for your reply! I have ported the pre-2019.2 version of batman to the 3.3 kernel and it is available for doing
Please don't do this. Now you are not only having the known bugs from Linux 3.3 but also the known bugs  from the pre-2019.2 batman-adv.
The correct approach is to get your used software updated to a non-EOL version.
Kind regards, Sven