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osmo-ttcn3-hacks
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bsc: add TC_lost_sdcch_during_assignment() 

Reproduce a segfault happening when the SDCCH (primary) lchan is lost
in-between a TCH Channel Activ and its Channel Activ Ack.

Related: SYS#5627
Related: I3b1cd88bea62ef0032f6c035bac95d3df9fdca7a (osmo-bsc)
Change-Id: I81cccdea450885d5241cab62000ad355d464dd49
This commit is contained in:
Neels Hofmeyr 2021-09-28 18:29:44 +02:00
parent ad26fc0017
commit 92cfa1c45a
1 changed files with 91 additions and 0 deletions
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91
bsc/BSC_Tests.ttcn
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@ -10155,6 +10155,95 @@ testcase TC_ctrl_trx_rf_locked() runs on test_CT {
f_shutdown_helper();
}
/* Reproduce a segfault happening when the SDCCH (primary) lchan is lost in-between a TCH Channel Activ and its Channel
* Activ Ack (SYS#5627). */
private function f_TC_lost_sdcch_during_assignment(charstring id) runs on MSC_ConnHdlr {
var PDU_BSSAP ass_cmd := f_gen_ass_req();
if (mp_bssap_cfg[0].transport == BSSAP_TRANSPORT_AoIP) {
ass_cmd.pdu.bssmap.assignmentRequest.codecList := g_pars.ass_codec_list;
}
ass_cmd.pdu.bssmap.assignmentRequest.channelType :=
f_BSSMAP_chtype_from_codec(g_pars.ass_codec_list.codecElements[0]);
var BSSMAP_FIELD_CodecType codecType;
codecType := valueof(ass_cmd.pdu.bssmap.assignmentRequest.codecList.codecElements[0].codecType);
f_MscConnHdlr_init(g_pars.media_nr, host_bts, host_mgw_mgcp, codecType);
/* First establish a signalling lchan */
f_create_chan_and_exp();
f_rslem_dchan_queue_enable();
/* we should now have a COMPL_L3 at the MSC */
var template PDU_BSSAP exp_l3_compl;
exp_l3_compl := tr_BSSMAP_ComplL3()
if (g_pars.aoip == false) {
exp_l3_compl.pdu.bssmap.completeLayer3Information.codecList := omit;
} else {
exp_l3_compl.pdu.bssmap.completeLayer3Information.codecList := ?;
}
timer T := 10.0;
T.start;
alt {
[] BSSAP.receive(exp_l3_compl);
[] BSSAP.receive(tr_BSSMAP_ComplL3) {
Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Received non-matching COMPLETE LAYER 3 INFORMATION");
}
[] T.timeout {
Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Timeout waiting for COMPLETE LAYER 3 INFORMATION");
}
}
f_create_mgcp_expect(ExpectCriteria:{omit,omit,omit});
activate(as_Media_mgw());
var RslChannelNr chan_nr := { u := { ch0 := RSL_CHAN_NR_Bm_ACCH }, tn := 1 };
f_rslem_register(0, chan_nr);
f_rslem_set_auto_chan_act_ack(RSL_PROC, false);
BSSAP.send(ass_cmd);
/* Wait for the Channel Activ for the TCH channel */
var ASP_RSL_Unitdata rx_rsl_ud;
RSL.receive(tr_ASP_RSL_UD(tr_RSL_MsgTypeD(RSL_MT_CHAN_ACTIV), sid := ?)) -> value rx_rsl_ud;
/* make the original SDCCH disappear */
RSL.send(ts_RSL_REL_IND(g_chan_nr, valueof(ts_RslLinkID_DCCH(0))));
/* and ACK the TCH channel activation. This caused a segfault up to OsmoBSC 1.7.0 (SYS#5627) */
RSL.send(ts_ASP_RSL_UD(ts_RSL_CHAN_ACT_ACK(chan_nr, 23), rx_rsl_ud.streamId));
interleave {
[] BSSAP.receive(tr_BSSMAP_AssignmentFail);
[] BSSAP.receive(tr_BSSMAP_ClearRequest);
}
BSSAP.send(ts_BSSMAP_ClearCommand(0));
BSSAP.receive(tr_BSSMAP_ClearComplete);
BSSAP.send(RAN_Conn_Prim:MSC_CONN_PRIM_DISC_REQ);
var MgcpCommand mgcp;
MGCP.receive(tr_DLCX()) -> value mgcp {
MGCP.send(ts_DLCX_ACK2(mgcp.line.trans_id));
};
f_sleep(0.5);
}
testcase TC_lost_sdcch_during_assignment() runs on test_CT {
var TestHdlrParams pars := f_gen_test_hdlr_pars();
var MSC_ConnHdlr vc_conn;
f_init(1, true);
f_sleep(1.0);
pars.ass_codec_list := valueof(ts_BSSMAP_IE_CodecList({ts_CodecFR}));
vc_conn := f_start_handler(refers(f_TC_lost_sdcch_during_assignment), pars);
vc_conn.done;
f_shutdown_helper();
}
control {
/* CTRL interface testing */
execute( TC_ctrl_msc_connection_status() );
@ -10462,6 +10551,8 @@ control {
execute( TC_imm_ass_pre_ts_ack_dyn_ts() );
execute( TC_ctrl_trx_rf_locked() );
execute( TC_lost_sdcch_during_assignment() );
}
}