(gdb) bt full
#0  0x00007f1b76f3e00c in nua_server_respond (sr=0x7f1b37037060, tags=0x0) at nua_server.c:523
        nh = 0xaaaaaaaaaaaaaaaa
        ds = 0xaaaaaaaaaaaaab12
        method = -1431655766
        next = {msg = 0x0, sip = 0x0}
        retval = 0
        user_contact = 1
        next_tags = {{t_tag = 0x7f1b7722d9e0 <siptag_end>, t_value = 0}, {t_tag = 0x7f1b772317e0 <tag_next>, t_value = 0}}
        msg = 0xaaaaaaaaaaaaaaaa
        sip = 0xaaaaaaaaaaaaaaaa
        m = 0x7f1b3710bd80
        __func__ = "nua_server_respond"
        __PRETTY_FUNCTION__ = "nua_server_respond"
#1  0x00007f1b76f44e73 in nua_dialog_repeat_shutdown (owner=0x7f1b4048ec00, ds=0x7f1b4048ec68) at nua_dialog.c:652
        du = 0x7f1b76feea94
        sr = 0x7f1b37037060
        sr_next = 0xaaaaaaaaaaaaaaaa
#2  0x00007f1b76f3b8ab in nua_stack_shutdown (nua=0x7f1b6c077480) at nua_stack.c:857
        ds = 0x7f1b4048ec68
        nh = 0x7f1b4048ec00
        nh_next = 0x7f1b3781b140
        busy = 0
        now = 3814570518
        status = 1765797136
        phrase = 0x7f1b6840e1ac "\""
        __func__ = "nua_stack_shutdown"
#3  0x00007f1b76f3b1ea in nua_stack_signal (nua=0x7f1b6c077480, msg=0x7f1b693fed10, ee=0x7f1b43c147e8) at nua_stack.c:594
        e = 0x7f1b43c147f0
        nh = 0x0
        tags = 0x7f1b43c14810
        event = nua_r_shutdown
        error = 0
        __func__ = "nua_stack_signal"
#4  0x00007f1b76fa63c1 in su_base_port_execute_msgs (queue=0x0) at su_base_port.c:280
        root = 0x7f1b6842c040
        f = 0x7f1b76f3aebb <nua_stack_signal>
        msg = 0x0
        n = 0
#5  0x00007f1b76fa614f in su_base_port_getmsgs (self=0x7f1b6840e100) at su_base_port.c:202
        queue = 0x7f1b43c147a0
#6  0x00007f1b76fa64b6 in su_base_port_run (self=0x7f1b6840e100) at su_base_port.c:335
        tout = 15000
        tout2 = 0
        __PRETTY_FUNCTION__ = "su_base_port_run"
#7  0x00007f1b76fa27cb in su_port_run (self=0x7f1b6840e100) at su_port.h:326
        base = 0x7f1b6840e100
#8  0x00007f1b76fa38b0 in su_root_run (self=0x7f1b6842c040) at su_root.c:819
        __PRETTY_FUNCTION__ = "su_root_run"
#9  0x00007f1b76fa7317 in su_pthread_port_clone_main (varg=0x7f1b7188c560) at su_pthread_port.c:343
        arg = 0x0
        task = {{sut_port = 0x7f1b6840e100, sut_root = 0x7f1b6842c040}}
        zap = 1
#10 0x00007f1b79a4f4a4 in start_thread (arg=0x7f1b693ff700) at pthread_create.c:456
        __res = <optimized out>
        pd = 0x7f1b693ff700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139755706644224, -6579755049183289566, 139755845633118, 139755845633119, 139755698253824, 3, 6523131849032130338, 6523166011938758434}, 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>
---Type <return> to continue, or q <return> to quit---
        __PRETTY_FUNCTION__ = "start_thread"
#11 0x00007f1b790c1d0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
No locals.