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On the frontend side, QUIC transfer can be performed either via a connection owned FD or multiplex on the listener one. When a quic_conn is freed and converted to quic_conn_closed instance, its FD if open is closed and all exchanges are now multiplex via the listener FD. This is different for the backend as connections only has the choice to use their owned FD. Thus, special care care must be taken when freeing a connection and converting it to a quic_conn_closed instance. In this case, qc_release_fd() is delayed to the quic_conn_closed release. Furthermore, when the FD is transferred, its iocb and owner fields are updated to the new quic_conn_closed instance. Without it, a crash will occur when accessing the freed quic_conn tasklet. A newly dedicated handler quic_conn_closed_sock_fd_iocb is used to ensure access to quic_conn_closed members only.