[Freeswitch-dev] Module segfault

[Juan Antonio Ibañez Santorum]

Do you any way to check if the channel is already destroyed having pointer
to it or querying the originating channel? Basically I need to know if and
when the outgoing channel (peer_channel) was anwered.
El 28/05/2016 18:53, "Michael Jerris" <mike at jerris.com> escribió:

> would need to see the entire module likely to see, but I suspect however
> this is being called, the channel is already destroyed
>
> On Saturday, May 28, 2016, Juan Antonio Ibañez Santorum <
> juanito1982 at gmail.com> wrote:
>
>> Hello,
>>
>>    I built one module similar to mod_niblebill for billing puroses. It
>> works ok but sometimes I get a segfault and I don't understand why. The
>> code I use in my application for generating outgoing session is:
>>
>> ------------------------------
>> status = switch_ivr_originate(session, &peer_session, &cause,
>> cadena_marcado_tmp, 0, NULL, rt->callerid_name, rt->callerid_number, NULL,
>> NULL, SOF_NONE, NULL);
>>
>> if(status == SWITCH_STATUS_SUCCESS){
>>
>>       if (switch_channel_test_flag(caller_channel, CF_PROXY_MODE)) {
>> switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_NOTICE, "%s: Llamada
>> switch_ivr_signal_bridge\n", rt->uuid);
>> switch_ivr_signal_bridge(session, peer_session);
>> } else {
>> switch_channel_t *channel = switch_core_session_get_channel(session);
>> switch_channel_t *peer_channel =
>> switch_core_session_get_channel(peer_session);
>> char *a_key = (char *) switch_channel_get_variable(channel,
>> "bridge_terminate_key");
>> char *b_key = (char *) switch_channel_get_variable(peer_channel,
>> "bridge_terminate_key");
>> int ok = 0;
>> //switch_input_callback_function_t func = NULL;
>> rt->peer_channel = peer_channel;
>> rt->peer_profile = switch_channel_get_caller_profile(peer_channel);
>>
>> if (a_key) {
>> a_key = switch_core_session_strdup(session, a_key);
>> ok++;
>> }
>> if (b_key) {
>> b_key = switch_core_session_strdup(session, b_key);
>> ok++;
>> }
>> if (switch_true(switch_channel_get_variable(caller_channel,
>> SWITCH_BYPASS_MEDIA_AFTER_BRIDGE_VARIABLE)) ||
>> switch_true(switch_channel_get_variable(peer_channel,
>> SWITCH_BYPASS_MEDIA_AFTER_BRIDGE_VARIABLE))) {
>> switch_channel_set_flag(caller_channel, CF_BYPASS_MEDIA_AFTER_BRIDGE);
>> }
>>
>> switch_core_session_enable_heartbeat(session, rt->heartbeat_interval);
>>
>> // Bridge
>> switch_ivr_multi_threaded_bridge(session, peer_session, NULL, NULL, NULL);
>> if(peer_channel){
>> if((peer_profile = switch_channel_get_caller_profile(peer_channel))){
>> }
>> rt->codec_out = switch_core_strdup(pool,
>> switch_channel_get_variable(peer_channel, "write_codec"));
>> }
>>
>> switch_core_session_disable_heartbeat(session);
>> }
>> }
>> ------------------------------
>>
>> At the end of the application function y use this code to do some tasks
>> if the call gets answered:
>>
>> ------------------------------
>> ...
>>
>> if(dc->rt->peer_channel && switch_channel_test_flag(dc->rt->peer_channel,
>> CF_ANSWERED)){
>>     // Tasks if answered
>>   }
>> ...
>> ------------------------------
>>
>>
>> I don't understand why sometimes switch_channel_test_flag generate a
>> segfault. GDB stack trace is:
>>
>>
>> ------------------------------
>> #0  0x00007f2947415420 in pthread_mutex_lock () from
>> /lib64/libpthread.so.0
>> #1  0x00007f2948e522f3 in switch_channel_test_flag
>> (channel=0x7f2934558a30,
>>     flag=CF_ANSWERED) at src/switch_channel.c:1539
>> #2  0x00007f292950dcf6 in procesar_hangup (session=0x7f293826b998)
>>     at
>> /usr/src/instalacion/09freeswitch/freeswitch-1.4.23/src/mod/applications/mod_svbilling/mod_svbilling.c:4743
>> #3  0x00007f29295153a8 in do_routing (session=0x7f293826b998)
>>     at
>> /usr/src/instalacion/09freeswitch/freeswitch-1.4.23/src/mod/applications/mod_svbilling/mod_svbilling.c:3937
>> #4  0x00007f2948e7d4d0 in switch_core_session_exec
>> (session=0x7f293826b998,
>>     application_interface=0xd73208, arg=0x7f293429d550 "process")
>>     at src/switch_core_session.c:2754
>> #5  0x00007f2948e7da32 in
>> switch_core_session_execute_application_get_flags (
>>     session=0x7f293826b998, app=0x7f293429d540 "svbillingapp",
>>     arg=0x7f293429d550 "process", flags=<value optimized out>)
>>     at src/switch_core_session.c:2624
>> #6  0x00007f2948e81794 in switch_core_standard_on_execute (
>>     session=0x7f293826b998) at src/switch_core_state_machine.c:283
>> #7  switch_core_session_run (session=0x7f293826b998)
>>     at src/switch_core_state_machine.c:535
>> #8  0x00007f2948e7c23e in switch_core_session_thread (
>>     thread=<value optimized out>, obj=0x7f293826b998)
>>     at src/switch_core_session.c:1607
>> ...
>> ------------------------------
>>
>> The generated core can be downloaded at:
>>
>> https://dl.dropboxusercontent.com/u/45510863/coretx/core.zip
>>
>> and the line generating the segfault inside switch_channel.c is
>>
>> ------------------------------
>> switch_mutex_lock(channel->flag_mutex);
>> ------------------------------
>>
>> I suppose I am doing something in a wrong way but I don't know which one.
>> Do anyone knows why?
>>
>> Regards
>>
>
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