(gdb) frame 0
#0  libtorrent::udp_tracker_connection::name_lookup (this=0xb518df80,
    error=@0xb6c08d50, i=
        {<boost::iterator_facade<asio::ip::basic_resolver_iterator<asio::ip::tcp>,const asio::ip::basic_resolver_entry<asio::ip::tcp>,boost::forward_traversal_tag,const asio::ip::basic_resolver_entry<asio::ip::tcp>&,ptrdiff_t>> = {<No data fields>}, values_ = {px = 0x87dd298, pn = {pi_ = 0x86d2a20}}, iter_ = {_M_current = 0x87c4210}}) at ../asio/datagram_socket_service.hpp:151
151       {
(gdb) list
146
147       /// Connect the datagram socket to the specified endpoint.
148       template <typename Error_Handler>
149       void connect(implementation_type& impl, const endpoint_type& peer_endpoint,
150           Error_Handler error_handler)
151       {
152         service_impl_.connect(impl, peer_endpoint, error_handler);
153       }
154
155       /// Start an asynchronous connect.