AMF is at 100% CPU after gNB disconnect

The CPU utilization is at 100% for the AMF (in docker container) once a gNB disconnects for the first time.

Using gdb, I saw that sctp::sctp_server::sctp_receiver_thread() loops over the open sockets. I wonder whether there is an unhandled event, due to the fact that inside the loop there is if (FD_ISSET()) without a corresponding else. The other option could be a non-blocking socket.