Erlang Core Network Signalling Projects » erlang/osmo_ss7

This happens when a lot of IPA concurrent clients send messages and end up in the same TCP packet due to naggle algorithm.
When that happens, ipa code in osmo_ss7 fails to decode in osmo-epdg:

*DBG* epdg_ue_fsm_262424287925697 receive call {auth_request,33,"internet"} from <0.204.0> in state state_new
*DBG* epdg_ue_fsm_262424287925697 send ok to <0.204.0>
*DBG* gsup_server new state {gsups_state,#Port<0.16>,4222,#Port<0.19>,
                             {ipa_ccm_options,"EPDG-00-00-00-00-00-00",
                              "0/0/0","00:00:00:00:00:00","00:00:00:00:00:00",
                              "00:00:00:00:00:00","00:00:00:00:00:00",
                              "00:00:00:00:00:00","EPDG-00-00-00-00-00-00",
                              false},
                             {set,6,16,16,8,80,48,
                              {[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],
                               []},
                              {{[],[],[],[],
                                [{gsups_ue,<<"262429242370912">>,<0.240.0>}],
                                [],
                                [{gsups_ue,<<"262423473100631">>,<0.243.0>}],
                                [],[],
                                [{gsups_ue,<<"262423491582839">>,<0.244.0>}],
                                [],[],
                                [{gsups_ue,<<"262424287925697">>,<0.248.0>}],
                                [{gsups_ue,<<"262426121377808">>,<0.245.0>}],
                                [{gsups_ue,<<"262426512097609">>,<0.246.0>}],
                                []}}}}
*DBG* epdg_ue_fsm_262424287925697 consume call {auth_request,33,"internet"} from <0.204.0> in state state_new => state_wait_auth_res
p
*DBG* gsup_server got {ipa,#Port<0.19>,
                           {osmo,5},
                           #{imsi => <<"262425921669062">>,
                             message_type => send_auth_info_req,
                             pdp_info_list =>
                                 [#{access_point_name => "internet",
                                    pdp_address =>
                                        #{address => #{},pdp_type_nr => 33,
                                          pdp_type_org => 241},
                                    pdp_context_id => 0}]}}
*DBG* epdg_ue_fsm_262425921669062 enter epdg_ue_fsm in state state_new
17:39:21.043 [error] Error in process <0.222.0> with exit value:
{{badmatch,<<0,32,238,5,8,1,8,98,66,98,68,72,146,87,244,5,18,16,1,0,17,2,241,33,18>>},[{ipa_proto,split_ipa_msg,1,[{file,"/tmp/osmo-
epdg/_build/default/lib/osmo_ss7/src/ipa_proto.erl"},{line,135}]},{ipa_proto,process_rx_ipa_msg,4,[{file,"/tmp/osmo-epdg/_build/defa
ult/lib/osmo_ss7/src/ipa_proto.erl"},{line,182}]},{ipa_proto,loop,3,[{file,"/tmp/osmo-epdg/_build/default/lib/osmo_ss7/src/ipa_proto
.erl"},{line,269}]}]}