miconda left a comment (kamailio/kamailio#4153)
It seems to be a Python thread that is stuck somehow. The backtrace points to:
- https://github.com/kamailio/kamailio/blob/master/src/modules/app_python3/pyt...
Added in commit 0ffe157bc13.
If you have time to test, can you try with app_python3s module without a mod-init callback for it? It should indicate if there is eventually an issue with multi-threading state altered by forking, as app_python3 initialises the class in mod-init before forking.