henningw left a comment (kamailio/kamailio#4313)
Hello, it looks that the crash happens during the kamailio shutdown process (maybe related to another, earlier crash?). Please update to a supported version of Kamailio, 5.5.6 is end of life. You can install on Debian 12 e.g. from the project debian repository the latest 5.8.x or 6.0.x.