(gdb) bt full
#0  0x00007f0351e69428 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
        resultvar = 0
        pid = 31863
        selftid = 31949
#1  0x00007f0351e6b02a in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x4, sa_sigaction = 0x4}, sa_mask = {__val = {18446742974197923840, 0, 139649162819360, 1515870810, 
              139652278661120, 139650537093744, 692, 139650537094408, 94500522020952, 1, 139652236019004, 139652237115984, 139652237129632, 0, 139652237115984, 
              139650537093744}}, sa_flags = 1417031680, sa_restorer = 0x7f02eca7fa70}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007f0351e61bd7 in __assert_fail_base (fmt=<optimized out>, 
    assertion=assertion@entry=0x7f02eca7fa70 "!\"Calling pjlib from unknown/external thread. You must \" \"register external threads with pj_thread_register() \" \"before calling any pjlib functions.\"", file=file@entry=0x7f02eca7f8d3 "../src/pj/os_core_unix.c", line=line@entry=692, 
    function=function@entry=0x7f02eca7fd08 "pj_thread_this") at assert.c:92
        str = 0x7f03080891e0 "\020\223\b\b\003\177"
        total = 4096
#3  0x00007f0351e61c82 in __GI___assert_fail (
    assertion=0x7f02eca7fa70 "!\"Calling pjlib from unknown/external thread. You must \" \"register external threads with pj_thread_register() \" \"before calling any pjlib functions.\"", file=0x7f02eca7f8d3 "../src/pj/os_core_unix.c", line=692, function=0x7f02eca7fd08 "pj_thread_this") at assert.c:101
No locals.
#4  0x00007f02eca6d809 in pj_thread_this () from /usr/lib/x86_64-linux-gnu/libpj.so.2
No symbol table info available.
#5  0x00007f02eca6d9ed in pj_mutex_lock () from /usr/lib/x86_64-linux-gnu/libpj.so.2
No symbol table info available.
#6  0x00007f02e64381f2 in pjsip_dlg_inc_lock () from /usr/lib/x86_64-linux-gnu/libpjsip.so.2
No symbol table info available.
#7  0x00007f02e64384c8 in pjsip_dlg_dec_session () from /usr/lib/x86_64-linux-gnu/libpjsip.so.2
No symbol table info available.
#8  0x000055f29df53709 in internal_ao2_ref (user_data=0x7f03280ba8e0, delta=delta@entry=-1, file=file@entry=0x55f29e0bcf86 "astobj2.c", line=line@entry=518, 
    func=func@entry=0x55f29e0bd058 <__FUNCTION__.9842> "__ao2_ref") at astobj2.c:451
        obj = 0x7f03280ba8c8
        obj_mutex = <optimized out>
        obj_rwlock = <optimized out>
        current_value = 0
        __PRETTY_FUNCTION__ = "internal_ao2_ref"
#9  0x000055f29df53cf8 in __ao2_ref (user_data=<optimized out>, delta=delta@entry=-1) at astobj2.c:518
No locals.
#10 0x00007f029c4eb75c in pjsip_acf_channel_read (chan=0x7f030803fb60, cmd=<optimized out>, data=0x7f029abe3c08 "pjsip,call-id", 
    buf=0x7f029abe3cb0 "42a54654-df25-4fd7-b463-8fa3cbcc0f03", len=128) at pjsip/dialplan_functions.c:878
        func_args = {session = 0x7f03280ba8e0, param = 0x7f029abe39a0 "pjsip", type = 0x7f029abe39a6 "call-id", field = 0x0, 
          buf = 0x7f029abe3cb0 "42a54654-df25-4fd7-b463-8fa3cbcc0f03", len = 128, ret = 0}
        channel = <optimized out>
        parse = <optimized out>
        args = {argc = 2, argv = 0x7f029abe3a18, param = 0x7f029abe39a0 "pjsip", type = 0x7f029abe39a6 "call-id", field = 0x0}
        __PRETTY_FUNCTION__ = "pjsip_acf_channel_read"
#11 0x00007f02bacb21b6 in func_channel_read (chan=0x7f030803fb60, function=0x7f029abe3c00 "CHANNEL", data=0x7f029abe3c08 "pjsip,call-id", 
---Type <return> to continue, or q <return> to quit---
    buf=0x7f029abe3cb0 "42a54654-df25-4fd7-b463-8fa3cbcc0f03", len=128) at func_channel.c:464
        ret = 0
        tmpcap = <optimized out>
        __PRETTY_FUNCTION__ = "func_channel_read"
#12 0x000055f29e04b2bc in ast_func_read (chan=chan@entry=0x7f030803fb60, function=function@entry=0x7f02a3214574 "CHANNEL(pjsip,call-id)", 
    workspace=workspace@entry=0x7f029abe3cb0 "42a54654-df25-4fd7-b463-8fa3cbcc0f03", len=len@entry=128) at pbx_functions.c:617
        copy = 0x7f029abe3c00 "CHANNEL"
        args = 0x7f029abe3c08 "pjsip,call-id"
        acfptr = 0x7f02baeb41e0 <channel_function>
        res = <optimized out>
        u = 0x7f0308045ea0
        __PRETTY_FUNCTION__ = "ast_func_read"
#13 0x00007f02a3214363 in assign_uuid (json_channel=<optimized out>) at res_hep_rtcp.c:65
        chan = 0x7f030803fb60
        buf = "42a54654-df25-4fd7-b463-8fa3cbcc0f03", '\000' <repeats 91 times>
        channel_name = 0x7f0308026a98 "PJSIP/opensips-gw3-00033586"
        uuid_type = <optimized out>
        uuid = 0x0
#14 rtcp_message_handler (message=<optimized out>) at res_hep_rtcp.c:138
        json_channel = <optimized out>
        from = <optimized out>
        json_payload = 0x7f030800a118
        payload = 0x7f0308035e08 "{\"type\":201,\"ssrc\":481926874,\"report_blocks\":[{\"highest_seq_no\":23533,\"source_ssrc\":-781526578,\"ia_jitter\":0,\"fraction_lost\":0,\"dlsr\":83886,\"packets_lost\":0,\"lsr\":\"1585240604\"}],\"report_count\":1,\"send"...
        json_blob = <optimized out>
        json_rtcp = <optimized out>
        capture_info = <optimized out>
        to = <optimized out>
#15 rtp_topic_handler (data=<optimized out>, sub=<optimized out>, message=<optimized out>) at res_hep_rtcp.c:156
        message_type = <optimized out>
#16 0x000055f29e082f66 in subscription_invoke (sub=0x55f29e8d5970, message=message@entry=0x7f0340001dc0) at stasis.c:434
        __PRETTY_FUNCTION__ = "subscription_invoke"
#17 0x000055f29e083800 in dispatch_exec_async (local=<optimized out>) at stasis.c:715
        sub = <optimized out>
        message = 0x7f0340001dc0
#18 0x000055f29e097fb6 in ast_taskprocessor_execute (tps=tps@entry=0x55f29e97ccd0) at taskprocessor.c:963
        local = {local_data = 0x55f29e8d5970, data = 0x7f0340001dc0}
        t = 0x7f03400055a0
        __PRETTY_FUNCTION__ = "ast_taskprocessor_execute"
#19 0x000055f29e098070 in default_tps_processing_function (data=data@entry=0x55f29e97a120) at taskprocessor.c:185
        listener = 0x55f29e97a120
        tps = 0x55f29e97ccd0
        pvt = 0x55f29e53bb00
        sem_value = 22002
        __PRETTY_FUNCTION__ = "default_tps_processing_function"
#20 0x000055f29e0a804c in dummy_start (data=<optimized out>) at utils.c:1238
---Type <return> to continue, or q <return> to quit---
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {94500531241088, -7103164153102519339, 0, 140733106931871, 139649162824128, 507904, 
                7163336578321429461, 3929744456728130517}, __mask_was_saved = 0}}, __pad = {0x7f029abe3ef0, 0x0, 0x0, 0x0}}
        __cancel_arg = 0x7f029abe4700
        __not_first_call = <optimized out>
        ret = <optimized out>
        a = {start_routine = 0x55f29e098020 <default_tps_processing_function>, data = 0x55f29e97a120, name = <optimized out>}
#21 0x00007f03529616ba in start_thread (arg=0x7f029abe4700) at pthread_create.c:333
        __res = <optimized out>
        pd = 0x7f029abe4700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139649162823424, -7103164153102519339, 0, 140733106931871, 139649162824128, 507904, 7163336578310943701, 
                7163776727384273877}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#22 0x00007f0351f3b41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
No locals.