Segfaulting on trying to access Users in Settings

[vaze159]

Hello everyone,

I am having a problematic issue that I can't seem to figure out. I am able to open the settings as root user just fine. When I click on Users, nothing happens. I am running on Linux kali 4.7.0-kali1-amd64 #1 SMP Debian 4.7.6-1kali1 (2016-10-17) x86_64 GNU/Linux. This is what I get in /var/log/syslog

Oct 27 21:00:09 kali kernel: [ 695.533180] gnome-control-c[1944]: segfault at 0 ip 00000000004c9a5d sp 00007fffae418480 error 4 in gnome-control-center[400000+394000]

I have tried running the command:
addr2line -e /usr/bin/gnome-control-center -fCi 0xC9A5D where 0xC9A5d is the offset into the object that was causing the problem and I get nothing.

I then ran:
addr2line -e /usr/bin/gnome-control-center -fCi 0x00000000004c9a5d and I get:
cc_universal_access_get_resource
??:?

Interesting...

I understand that the cause of this was that a user mode instruction resulted in a page fault. I have a couple gnome-control-center files of interest listed here:
/usr/share/bash-completion/completions/gnome-control-center
/usr/bin/gnome-control-center

When I look at Github for gnome-control-center. I find the cc_ua_panel.c file. It has a method in it where I have found the call to cc_universal_get_resource as follows. I am not sure how relevant this code really is but anywho.

static void
cc_ua_panel_init (CcUaPanel *self)
{
  CcUaPanelPrivate *priv;
  GtkWidget *panel;
  GtkWidget *content;

  priv = self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
                                                   CC_TYPE_UA_PANEL,
                                                   CcUaPanelPrivate);

  g_resources_register (cc_universal_access_get_resource ());

  priv->interface_settings = g_settings_new (INTERFACE_SETTINGS);
  priv->a11y_settings = g_settings_new (A11Y_SETTINGS);
  priv->wm_settings = g_settings_new (WM_SETTINGS);
  priv->kb_settings = g_settings_new (KEYBOARD_SETTINGS);
  priv->kb_desktop_settings = g_settings_new (KEYBOARD_DESKTOP_SETTINGS);
  priv->mouse_settings = g_settings_new (MOUSE_SETTINGS);
  priv->gsd_mouse_settings = g_settings_new (GSD_MOUSE_SETTINGS);
  priv->application_settings = g_settings_new (APPLICATION_SETTINGS);

  priv->builder = gtk_builder_new ();
  gtk_builder_add_from_resource (priv->builder,

                                 "/org/gnome/control-center/universal-access/uap.ui",
                                 NULL);

  cc_ua_panel_init_status (self);
  cc_ua_panel_init_seeing (self);
  cc_ua_panel_init_hearing (self);
  cc_ua_panel_init_keyboard (self);
  cc_ua_panel_init_mouse (self);

  panel = WID ("universal_access_panel");
  content = WID ("universal_access_content");

  gtk_scrolled_window_set_min_content_height (GTK_SCROLLED_WINDOW (panel), SCROLL_HEIGHT);

  priv->focus_adjustment = gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (panel));
  gtk_container_set_focus_vadjustment (GTK_CONTAINER (content), priv->focus_adjustment);

  gtk_container_add (GTK_CONTAINER (self), panel);
}

I have no clue what the problem here could be if this is indeed the problem and do not know how to proceed.

Here is the backtrace

Thread 1 "gnome-control-c" received signal SIGSEGV, Segmentation fault.
0x00000000004c9a5d in ?? ()
(gdb) bt full
#0  0x00000000004c9a5d in ?? ()
No symbol table info available.
#1  0x00007ffff0b74f75 in g_closure_invoke ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#2  0x00007ffff0b86f82 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#3  0x00007ffff0b8fbcc in g_signal_emit_valist ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#4  0x00007ffff0b8ffaf in g_signal_emit ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#5  0x00007ffff0b793a4 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#6  0x00007ffff0b7b861 in g_object_notify ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#7  0x00007ffff58587e2 in ?? () from /usr/lib/libaccountsservice.so.0
No symbol table info available.
#8  0x00007ffff0e424e3 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
---Type <return> to continue, or q <return> to quit---return
No symbol table info available.
#9  0x00007ffff0e42b96 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#10 0x00007ffff0e80a5b in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#11 0x00007ffff0e424e3 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#12 0x00007ffff0e42b96 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#13 0x00007ffff0e7568a in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#14 0x00007ffff0e424e3 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#15 0x00007ffff0e42519 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#16 0x00007ffff089b68a in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#17 0x00007ffff089ba40 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#18 0x00007ffff089baec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#19 0x00007ffff0e5770d in g_application_run () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#20 0x000000000044cff7 in main ()
No symbol table info available.

[vaze159]

I filed a bug report here: https://bugzilla.gnome.org/show_bug.cgi?id=773673

My question now is about a comment one of the gnome-control-center developers replied with:

Please install the debug versions of the necessary packages to get a useful backtrace. If in doubt, please contact your distribution for help.

Where can I find the necessary debug packages for gnome-control-center so that I can provide them with the necessary information they need. This is actually a problem on a couple of my machines. Exact same instruction pointer address and exact same result from

ip2addr

command on all machines.

[vaze159]

I still have not gotten support or help for this issue and it is still really relevant. I have upgraded the distro and still the issue persists.

Now I am running on Linux kali 4.8.0-kali1-amd64 #1 SMP Debian 4.8.5-1kali1 (2016-11-04) x86_64 GNU/Linux.

I have also filed a bug report here as well: https://bugs.kali.org/view.php?id=3709.

Nobody has the slightest clue???

[P373]

Have you tried creating a non-root user with admin privs and running it?

[vaze159]

I know this is a late reply, but the issue was resolved by going to the terminal and running "adduser temp" then going to gnome-control-center and accessing the Users settings. It then allowed me to do so. I guess the fact if you are logged in as root and try to access those settings from the gnome-control-center, it segfaults because it is looking for a user for whatever reason it may be and there are none (but root). I still feel this is a bug that needs to be fixed, so I updated my bug reports.