Segmentation fault ain't consistent,
when Xfce Terminal manages to start up, while entering the first character ...

~~~ ~~~ ~~~~~ ~~~~~~ ~ ~~ ~~ ~~~~~~~~ ~ ~~~~

$ gdb
GNU gdb (GDB) Fedora 7.11.90.20160807-7.fc26
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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(gdb) attach 5193
Attaching to process 5193
[New LWP 5194]
[New LWP 5195]
[New LWP 5196]
Error while reading shared library symbols for /lib64/libpthread.so.0:
Cannot find user-level thread for LWP 5196: capability not available
0x00007f9b5431200d in poll () at ../sysdeps/unix/syscall-template.S:84
84	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
(gdb) continue
Continuing.

Thread 1 "xfce4-terminal" received signal SIGSEGV, Segmentation fault.
0x00007f9b56a82cca in XSync (dpy=0x55b028e07af0, discard=0) at Sync.c:42
42	    LockDisplay(dpy);
(gdb) thread apply all backtrace

Thread 4 (LWP 5196):
#0  0x00007f9b5431200d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f9b54843216 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7f9b340010c0, timeout=<optimized out>, context=0x55b028e28ff0)
    at gmain.c:4226
#2  0x00007f9b54843216 in g_main_context_iterate (context=context@entry=0x55b028e28ff0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>)
    at gmain.c:3922
#3  0x00007f9b5484332c in g_main_context_iteration (context=context@entry=0x55b028e28ff0, may_block=may_block@entry=1) at gmain.c:3988
#4  0x00007f9b48681fad in dconf_gdbus_worker_thread (user_data=0x55b028e28ff0)
    at dconf-gdbus-thread.c:82
#5  0x00007f9b5486aac3 in g_thread_proxy (data=0x55b028e14e80) at gthread.c:784
#6  0x00007f9b545e26ba in start_thread (arg=0x7f9b437fe700)
    at pthread_create.c:333
#7  0x00007f9b5431d3cf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (LWP 5195):
#0  0x00007f9b5431200d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f9b54843216 in g_main_context_poll (priority=<optimized out>, n_fds=2, fds=0x7f9b3c0010c0, timeout=<optimized out>, context=0x55b028e12fb0)
    at gmain.c:4226
#2  0x00007f9b54843216 in g_main_context_iterate (context=0x55b028e12fb0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3922
#3  0x00007f9b548435a2 in g_main_loop_run (loop=0x55b028defde0) at gmain.c:4123
#4  0x00007f9b5503d2d6 in gdbus_shared_thread_func (user_data=0x55b028e12f80)
    at gdbusprivate.c:247
#5  0x00007f9b5486aac3 in g_thread_proxy (data=0x55b028e14ca0) at gthread.c:784
#6  0x00007f9b545e26ba in start_thread (arg=0x7f9b43fff700)
    at pthread_create.c:333
#7  0x00007f9b5431d3cf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (LWP 5194):
#0  0x00007f9b5431200d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f9b54843216 in g_main_context_poll (priority=<optimized out>, n_fds=2, fds=0x7f9b440008e0, timeout=<optimized out>, context=0x55b028e12870)
    at gmain.c:4226
#2  0x00007f9b54843216 in g_main_context_iterate (context=context@entry=0x55b028e12870, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>)
    at gmain.c:3922
#3  0x00007f9b5484332c in g_main_context_iteration (context=0x55b028e12870, may_block=may_block@entry=1) at gmain.c:3988
#4  0x00007f9b54843371 in glib_worker_main (data=<optimized out>)
    at gmain.c:5781
#5  0x00007f9b5486aac3 in g_thread_proxy (data=0x55b028e14c50) at gthread.c:784
#6  0x00007f9b545e26ba in start_thread (arg=0x7f9b49088700)
    at pthread_create.c:333
#7  0x00007f9b5431d3cf in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (LWP 5193):
#0  0x00007f9b56a82cca in XSync (dpy=0x55b028e07af0, discard=0) at Sync.c:42
#1  0x00007f9b559f31b1 in after_process_all_updates () at gdkwindow.c:3985
#2  0x00007f9b559f31b1 in gdk_window_process_all_updates () at gdkwindow.c:4051
#3  0x00007f9b56815261 in update_timeout(gpointer) (data=data@entry=0x0)
    at vte.cc:10711
#4  0x00007f9b5484394d in g_timeout_dispatch (source=0x55b028e54700, callback=0x7f9b56815200 <update_timeout(gpointer)>, user_data=0x0) at gmain.c:4672
#5  0x00007f9b54842f02 in g_main_dispatch (context=0x55b028e08b70)
    at gmain.c:3201
#6  0x00007f9b54842f02 in g_main_context_dispatch (context=context@entry=0x55b028e08b70) at gmain.c:3854
#7  0x00007f9b54843280 in g_main_context_iterate (context=0x55b028e08b70, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3927
#8  0x00007f9b548435a2 in g_main_loop_run (loop=0x55b028de4ba0) at gmain.c:4123
#9  0x00007f9b55ee0275 in gtk_main () at gtkmain.c:1295
#10 0x000055b027d190c6 in main (argc=<optimized out>, argv=<optimized out>)
    at main.c:327
(gdb) backtrace full
#0  0x00007f9b56a82cca in XSync (dpy=0x55b028e07af0, discard=0) at Sync.c:42
        rep = 
          {type = 1 '\001', revertTo = 2 '\002', sequenceNumber = 903, length = 0, focus = 685891600, pad1 = 21936, pad2 = 686828896, pad3 = 21936, pad4 = 691679136, pad5 = 21936}
#1  0x00007f9b559f31b1 in after_process_all_updates () at gdkwindow.c:3985
        displays = 0x55b0293a2fa0 = {0x55b02912d070, 0x55b028e1e010}
        l = 0x55b0293a2f60 = {0x55b028e1e010}
        display_class = 0x55b028f02d60
        old_update_windows = <optimized out>
        tmp_list = <optimized out>
        in_process_all_updates = 1
        got_recursive_update = 0
#2  0x00007f9b559f31b1 in gdk_window_process_all_updates () at gdkwindow.c:4051
        old_update_windows = <optimized out>
        tmp_list = <optimized out>
        in_process_all_updates = 1
        got_recursive_update = 0
#3  0x00007f9b56815261 in update_timeout(gpointer) (data=data@entry=0x0)
    at vte.cc:10711
        l = 0x0
        next = 0x0
        redraw = 1
#4  0x00007f9b5484394d in g_timeout_dispatch (source=0x55b028e54700, callback=0x7f9b56815200 <update_timeout(gpointer)>, user_data=0x0) at gmain.c:4672
        timeout_source = 0x55b028e54700
        again = <optimized out>
#5  0x00007f9b54842f02 in g_main_dispatch (context=0x55b028e08b70)
    at gmain.c:3201
        dispatch = 0x7f9b54843930 <g_timeout_dispatch>
        prev_source = 0x0
        was_in_call = 0
        user_data = 0x0
        callback = 0x7f9b56815200 <update_timeout(gpointer)>
        cb_funcs = 0x7f9b54b09280 <g_source_callback_funcs>
        cb_data = 0x55b0293b5320
        need_destroy = <optimized out>
        source = 0x55b028e54700
        current = 0x55b028e12030
        i = 0
#6  0x00007f9b54842f02 in g_main_context_dispatch (context=context@entry=0x55b028e08b70) at gmain.c:3854
#7  0x00007f9b54843280 in g_main_context_iterate (context=0x55b028e08b70, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3927
        max_priority = 2147483647
        timeout = 15
        some_ready = 1
        nfds = 6
        allocated_nfds = 6
        fds = <optimized out>
#8  0x00007f9b548435a2 in g_main_loop_run (loop=0x55b028de4ba0) at gmain.c:4123
        __func__ = "g_main_loop_run"
#9  0x00007f9b55ee0275 in gtk_main () at gtkmain.c:1295
        loop = 0x55b028de4ba0
#10 0x000055b027d190c6 in main (argc=<optimized out>, argv=<optimized out>)
    at main.c:327
        show_help = 0
        show_version = 0
        show_colors = 0
        disable_server = 0
        app = 0x55b028e74590 [TerminalApp]
        startup_id = <optimized out>
        display = <optimized out>
        error = 0x0
        nargv = 0x55b028e03620
        nargc = 4
        n = <optimized out>
        msg = <optimized out>
(gdb) q
A debugging session is active.

	Inferior 1 [process 5193] will be detached.

Quit anyway? (y or n) y
Detaching from program: /usr/bin/xfce4-terminal, process 5193

~ ~~~~~~~~~~~ ~~~~ ~~~~

$ coredumpctl dump 5193
           PID: 5193 (xfce4-terminal)
           UID: 1000 (test)
           GID: 1000 (test)
        Signal: 11 (SEGV)
           ...
  Command Line: xfce4-terminal
    Executable: /usr/bin/xfce4-terminal
 Control Group: /user.slice/user-1000.slice/user@1000.service/gnome-terminal-server.service
          Unit: user@1000.service
     User Unit: user@1000.service
         Slice: user-1000.slice
     Owner UID: 1000 (test)
           ...
      Coredump: /var/lib/systemd/coredump/core.xfce4-terminal.1000.....5193.1472393354000000000000.lz4
       Message: Process 5193 (xfce4-terminal) of user 1000 dumped core.
                
                Stack trace of thread 5193:
                #0  0x00007f9b56a82cca XSync (libX11.so.6)
                #1  0x00007f9b559f31b1 after_process_all_updates (libgdk-3.so.0)
                #2  0x00007f9b56815261 update_timeout (libvte-2.91.so.0)
                #3  0x00007f9b5484394d g_timeout_dispatch (libglib-2.0.so.0)
                #4  0x00007f9b54842f02 g_main_dispatch (libglib-2.0.so.0)
                #5  0x00007f9b54843280 g_main_context_iterate (libglib-2.0.so.0)
                #6  0x00007f9b548435a2 g_main_loop_run (libglib-2.0.so.0)
                #7  0x00007f9b55ee0275 gtk_main (libgtk-3.so.0)
                #8  0x000055b027d190c6 main (xfce4-terminal)
                #9  0x00007f9b54236421 __libc_start_main (libc.so.6)
                #10 0x000055b027d194aa _start (xfce4-terminal)
                
                Stack trace of thread 5196:
                #0  0x00007f9b5431200d poll (libc.so.6)
                #1  0x00007f9b54843216 g_main_context_poll (libglib-2.0.so.0)
                #2  0x00007f9b5484332c g_main_context_iteration (libglib-2.0.so.0)
                #3  0x00007f9b48681fad dconf_gdbus_worker_thread (libdconfsettings.so)
                #4  0x00007f9b5486aac3 g_thread_proxy (libglib-2.0.so.0)
                #5  0x00007f9b545e26ba start_thread (libpthread.so.0)
                #6  0x00007f9b5431d3cf __clone (libc.so.6)
                
                Stack trace of thread 5194:
                #0  0x00007f9b5431200d poll (libc.so.6)
                #1  0x00007f9b54843216 g_main_context_poll (libglib-2.0.so.0)
                #2  0x00007f9b5484332c g_main_context_iteration (libglib-2.0.so.0)
                #3  0x00007f9b54843371 glib_worker_main (libglib-2.0.so.0)
                #4  0x00007f9b5486aac3 g_thread_proxy (libglib-2.0.so.0)
                #5  0x00007f9b545e26ba start_thread (libpthread.so.0)
                #6  0x00007f9b5431d3cf __clone (libc.so.6)
                
                Stack trace of thread 5195:
                #0  0x00007f9b5431200d poll (libc.so.6)
                #1  0x00007f9b54843216 g_main_context_poll (libglib-2.0.so.0)
                #2  0x00007f9b548435a2 g_main_loop_run (libglib-2.0.so.0)
                #3  0x00007f9b5503d2d6 gdbus_shared_thread_func (libgio-2.0.so.0)
                #4  0x00007f9b5486aac3 g_thread_proxy (libglib-2.0.so.0)
                #5  0x00007f9b545e26ba start_thread (libpthread.so.0)
                #6  0x00007f9b5431d3cf __clone (libc.so.6)
Refusing to dump core to tty.