ctylihuai left a comment (kamailio/kamailio#4238)
From the GDB output, two issues are apparent: 1. The `tcp_main` process was not configured as a worker, yet a local connection in the main process triggered `tcpconn_read_timeout`. 2. The `tcp_main_ltimer` list is corrupted: the doubly-linked list contains multiple `head` pointers, some null pointers, and reader timer pointers.