Okay, it's definintely crashing in libindicate. The process is in
libindicate/server.c's bus_connection_cb() callback func and calls
g_bus_get_finish() to complete making the connection. g_bus_get_finish()
returns an error, which bus_connection_cb() tries to log. The crash
takes place while logging the error, making me think the error message
is corrupt.

The code:

    static void
    bus_connection_cb (GObject * obj, GAsyncResult * res, gpointer user_data)
    {
            GError * error = NULL;

            GDBusConnection * connection = g_bus_get_finish(res, &error);
            if (error != NULL) {
                    g_error("Unable to get session bus: %s", error->message);
                    g_error_free(error);
                    return;
            }

And the relevant parts of the ThreadStacktrace:

#0  g_logv (log_domain=0x7f6e5e523432 "libindicate", log_level=<optimized out>, 
format=0x7f6e5e5237c6 "Unable to get session bus: %s", args1=0x7fff70a89ac8) at 
/build/buildd/glib2.0-2.31.14/./glib/gmessages.c:765
        domain = 0x0
        data = <optimized out>
        depth = 0
        log_func = <optimized out>
        domain_fatal_mask = <optimized out>
        masquerade_fatal = <optimized out>
        test_level = <optimized out>
        was_fatal = 0
        was_recursion = 0
        i = <optimized out>
#1  0x00007f6e5d47f062 in g_log (log_domain=<optimized out>, 
log_level=<optimized out>, format=<optimized out>) at 
/build/buildd/glib2.0-2.31.14/./glib/gmessages.c:792
        args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 
0x7fff70a89ba0, reg_save_area = 0x7fff70a89ae0}}
#2  0x00007f6e5e51dd6c in bus_connection_cb (obj=<optimized out>, 
res=<optimized out>, user_data=0x161e820) at 
/build/buildd/libindicate-0.6.1/./libindicate/server.c:694
        error = 0x16288b0
        connection = 0x0
        server = <optimized out>
        priv = <optimized out>

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https://bugs.launchpad.net/bugs/925829

Title:
  telepathy-indicator crashed with signal 5 in
  g_simple_async_result_complete()

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