** Changed in: gnome-desktop3 (Debian)
       Status: Unknown => Fix Released

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https://bugs.launchpad.net/bugs/1933022

Title:
  gnome control-center crashed with sigsegv in g_str_hash() whenever I
  try to  add input sources

Status in gnome-desktop:
  Unknown
Status in gnome-desktop3 package in Ubuntu:
  Fix Committed
Status in gnome-desktop3 source package in Hirsute:
  In Progress
Status in gnome-desktop3 package in Debian:
  Fix Released

Bug description:
  [Impact]

  If the dconf key show-all-sources is "true", any attempt to add new
  input sources via Settings results in a segfault. It means that users
  can't make use of the so-called "exotic" XKB keyboard layouts.

  The proposed upload includes a cherry picked upstream commit which
  fixes the issue.

  [Test Plan]

  1. Enable show-all-sources:

     gsettings set org.gnome.desktop.input-sources show-all-sources true

  2. Select Settings -> Region & Language and click the + button to add
     an input source.

  -> Find that g-c-c crashes.

  3. Install the gnome-desktop3 binaries from hirsute-proposed.

  4. Repeat step 2.

  -> Find that you are able to add an input source.

  [Where problems could occur]

  The change is a targeted fix to address the issue at hand. It was
  committed upstream on April 22, and no reported regression.

  [Original description]

  I've been facing the problems for about 9 months now. Back then I
  thought that maybe getting a new version would solve the problem, but
  turns out it didn't. Whenever I try to add some Input Sources from it
  just crashes.

  Reproducing it is very easy: running gnome-control-center, then going
  to Input Sources settings and clicking Add(+) would generate the
  crash. But the weird thing is that I've been unable to reproduce it in
  VM. And I also tried to reinstall most of the packages which, I think
  if changed/misconfigured would cause this but it didn't help. I also
  tried to use debsums to give some clues but didn't find any.

  After enough digging, this is what I can retrieve from gdb:

  #0  g_str_hash (v=0x506) at ../../../glib/ghash.c:2333
          p = 0x506 <error: Cannot access memory at address 0x506>
          h = 5381
  #1  0x00007ffff7c6e174 in g_hash_table_lookup_node (hash_return=<synthetic 
pointer>, key=0x506, hash_table=0x5555563a6180 = {...}) at 
../../../glib/ghash.c:472
          node_hash = <optimized out>
          hash_value = <optimized out>
          have_tombstone = 0
          step = 0
          node_index = <optimized out>
          first_tombstone = 0
          node_hash = <optimized out>
          __func__ = "g_hash_table_lookup_extended"
  #2  g_hash_table_lookup_extended (hash_table=0x5555563a6180 = {...}, 
lookup_key=lookup_key@entry=0x506, orig_key=orig_key@entry=0x0, 
value=value@entry=0x7fffffffcbb0) at ../../../glib/ghash.c:1548
          node_hash = <optimized out>
          __func__ = "g_hash_table_lookup_extended"
  #3  0x00007ffff6f03013 in gnome_xkb_info_get_layout_info (self=<optimized 
out>, id=id@entry=0x506 <error: Cannot access memory at address 0x506>, 
display_name=display_name@entry=0x7fffffffcc10, 
short_name=short_name@entry=0x0, xkb_layout=xkb_layout@entry=0x0, 
xkb_variant=xkb_variant@entry=0x0) at ../libgnome-desktop/gnome-xkb-info.c:1042
          priv = 0x555556395600
          layout = 0x7ffff6262ba0 <main_arena>
          __func__ = "gnome_xkb_info_get_layout_info"
  #4  0x00005555555fe467 in input_source_row_new 
(self=self@entry=0x5555568d22b0, type=type@entry=0x5555556dcac3 "xkb", 
id=id@entry=0x506 <error: Cannot access memory at address 0x506>) at 
../panels/keyboard/cc-input-chooser.c:236
          display_name = 0x0
          row = 0x0
          widget = <optimized out>
  #5  0x00005555555fe81d in add_rows_to_table (self=self@entry=0x5555568d22b0, 
info=info@entry=0x555556450320, list=0x555555c82100 = {...}, 
list@entry=0x555555c8bec0 = {...}, type=type@entry=0x5555556dcac3 "xkb", 
default_id=0x0) at ../panels/keyboard/cc-input-chooser.c:723
          table = 0x555556770000 = {[0x55555657bb00 "cm+mmuock"] = 
0x555556ca91a0, [0x555556506340 "us+3l"] = 0x555556400920, [0x55555656f6f0 
"ph+capewell-dvorak"] = 0x555556cb6f50, [0x55555660caf0 "us+dvorak-l"] = 
0x555556ca9620, [0x55555656cd40 "gb+mac_intl"] = 0x555556cb6950, 
[0x55555650de80 "gh+gillbt"] = 0x555556cb61d0, [0x555556571540 "apl+aplx"] = 
0x555556ca94a0, [0x5555565063a0 "us+3l-cros"] = 0x555556cb64d0, [0x5555565062b0 
"us+carpalx-full-intl"] = 0x555556400aa0, [0x555556506070 "us+sun_type6"] = 
0x555556cb6350, [0x555556505f50 "us+drix"] = 0x555556ca9320, [0x555556506b40 
"cm+dvorak"] = 0x555556cb6dd0, [0x5555564faaf0 "us+dvp"] = 0x555556cb6650, 
[0x5555564faa80 "us+dvorak-classic"] = 0x5555564004a0, [0x5555564fad30 
"us+olpc2"] = 0x555556400c20, [0x55555656f2d0 "ml+us-intl"] = 0x555556400620, 
[0x5555564f9c70 "eu"] = 0x555556400320, [0x555556506310 
"us+carpalx-full-altgr-intl"] = 0x5555564007a0, [0x55555656c390 "gb+intl"] = 
0x555556ca97a0, [0x555556506fc0 "ca+eng"] = 0x555556cb67d0, [0x5555565714a0 
"apl+aplplusII"] = 0x555556400f20, [0x5555564fafb0 "us+norman"] = 
0x555556400da0, [0x55555660ca90 "us+dvorak-intl"] = 0x555556cb6ad0, 
[0x555556506140 "us+carpalx-intl"] = 0x555556cb6c50}
          row = <optimized out>
          id = 0x506 <error: Cannot access memory at address 0x506>
  #6  0x00005555555ffb78 in get_locale_infos (self=0x5555568d22b0) at 
../panels/keyboard/cc-input-chooser.c:950
          country_code = 0x55555680eb50 "BW"
          simple_locale = 0x55555680eb70 "en_BW.UTF-8"
          tmp = 0x5555568acf70 "English (Botswana)"
          type = 0x0
          language_layouts = 0x555555c8bec0
          lang_code = 0x55555680eb30 "en"
          id = 0x0
          layouts_with_locale = 0x555556772e40
          info = 0x555556450320
          locale = 0x55555680e950
          all_layouts = 0x0
          locale_ids = 0x55555680e950
          l = <optimized out>
          self = 0x5555568d22b0
          error = 0x0
  #7  cc_input_chooser_new (is_login=<optimized out>, xkb_info=<optimized out>, 
ibus_engines=<optimized out>) at ../panels/keyboard/cc-input-chooser.c:1068
          self = 0x5555568d22b0
          error = 0x0
  #8  0x00005555555f6ebc in show_input_chooser (self=0x555556396200) at 
../panels/keyboard/cc-input-list-box.c:443
          chooser = <optimized out>
  #9  0x00007ffff7d7d61e in g_cclosure_marshal_VOID__OBJECTv 
(closure=0x55555639a220, return_value=<optimized out>, instance=<optimized 
out>, args=<optimized out>, marshal_data=<optimized out>, n_params=<optimized 
out>, param_types=0x555556200930) at ../../../gobject/gmarshal.c:1910
          data1 = 0x555556396200
          data2 = <optimized out>
          callback = 0x5555555f6fe0 <input_row_activated_cb>
          arg0 = 0x555556277a50
          args_copy = {{gp_offset = 32, fp_offset = 48, overflow_arg_area = 
0x7fffffffd060, reg_save_area = 0x7fffffffcfa0}}
  #10 0x00007ffff7d9c724 in _g_closure_invoke_va (param_types=0x555556200930, 
n_params=1, args=0x7fffffffcf80, instance=0x555556396200, 
return_value=<optimized out>, closure=<optimized out>) at 
../../../gobject/gclosure.c:873
          marshal = <optimized out>
          marshal_data = <optimized out>
          in_marshal = 0
          real_closure = <optimized out>
          return_accu = <optimized out>
          accu = {g_type = 0x0, data = {{v_int = 0, v_uint = 0, v_long = 0, 
v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 
0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 
0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          accumulator = 0x0
          emission = Python Exception <class 'TypeError'> can only concatenate 
str (not "NoneType") to str:
  {next = 0x7fffffffd160, instance = 0x555556396200, ihint = {signal_id = 313, 
detail = 0, run_type = (G_SIGNAL_RUN_FIRST | G_SIGNAL_ACCUMULATOR_FIRST_RUN)}, 
state = EMISSION_RUN, chain_type = }
          signal_id = 313
          instance_type = <optimized out>
          emission_return = {g_type = 0x0, data = {{v_int = 0, v_uint = 0, 
v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, 
v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, 
v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          rtype = 0x4
          static_scope = 0
          fastpath_handler = <optimized out>
          closure = <optimized out>
          run_type = <optimized out>
          hlist = <optimized out>
          l = <optimized out>
          fastpath = 1
          instance_and_params = <optimized out>
          signal_return_type = <optimized out>
          param_values = <optimized out>
          node = <optimized out>
          i = <optimized out>
          n_params = <optimized out>
          __func__ = "g_signal_emit_valist"
  #11 g_signal_emit_valist (instance=0x555556396200, signal_id=<optimized out>, 
detail=<optimized out>, var_args=var_args@entry=0x7fffffffcf80) at 
../../../gobject/gsignal.c:3406
          return_accu = <optimized out>
          accu = {g_type = 0x0, data = {{v_int = 0, v_uint = 0, v_long = 0, 
v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 
0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 
0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          accumulator = 0x0
          emission = Python Exception <class 'TypeError'> can only concatenate 
str (not "NoneType") to str:
  {next = 0x7fffffffd160, instance = 0x555556396200, ihint = {signal_id = 313, 
detail = 0, run_type = (G_SIGNAL_RUN_FIRST | G_SIGNAL_ACCUMULATOR_FIRST_RUN)}, 
state = EMISSION_RUN, chain_type = }
          signal_id = 313
          instance_type = <optimized out>
          emission_return = {g_type = 0x0, data = {{v_int = 0, v_uint = 0, 
v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, 
v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, 
v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          rtype = 0x4
          static_scope = 0
          fastpath_handler = <optimized out>
          closure = <optimized out>
          run_type = <optimized out>
          hlist = <optimized out>
          l = <optimized out>
          fastpath = 1
          instance_and_params = <optimized out>
          signal_return_type = <optimized out>
          param_values = <optimized out>
          node = <optimized out>
          i = <optimized out>
          n_params = <optimized out>
          __func__ = "g_signal_emit_valist"
  #12 0x00007ffff7d9c893 in g_signal_emit (instance=<optimized out>, 
signal_id=<optimized out>, detail=<optimized out>) at 
../../../gobject/gsignal.c:3553
          var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 
0x7fffffffd060, reg_save_area = 0x7fffffffcfa0}}
  #13 0x00007ffff7626199 in gtk_list_box_select_and_activate_full 
(grab_focus=1, row=0x555556277a50, box=0x555556396200) at 
../../../../gtk/gtklistbox.c:1820
          focus_on_click = 1
          priv = 0x555556396010
  #14 gtk_list_box_select_and_activate_full (grab_focus=1, row=0x555556277a50, 
box=0x555556396200) at ../../../../gtk/gtklistbox.c:1812
          focus_on_click = 1
          priv = 0x555556396010
  #15 gtk_list_box_multipress_gesture_released (gesture=<optimized out>, 
n_press=1, x=<optimized out>, y=<optimized out>, box=0x555556396200) at 
../../../../gtk/gtklistbox.c:2016
          focus_on_click = 1
          priv = 0x555556396010
  #16 0x00007ffff77d264b in _gtk_marshal_VOID__INT_DOUBLE_DOUBLEv 
(closure=<optimized out>, return_value=<optimized out>, instance=<optimized 
out>, args=<optimized out>, marshal_data=<optimized out>, n_params=<optimized 
out>, param_types=0x5555561382d0) at gtkmarshalers.c:4803
          data1 = <optimized out>
          data2 = <optimized out>
          callback = <optimized out>
          arg0 = 1286
          arg1 = 2.1137067449068142e-314
          arg2 = 1.4951811470334148e+248
          args_copy = {{gp_offset = 32, fp_offset = 80, overflow_arg_area = 
0x7fffffffd340, reg_save_area = 0x7fffffffd280}}
  #17 0x00007ffff7d9c724 in _g_closure_invoke_va (param_types=0x5555561382d0, 
n_params=3, args=0x7fffffffd260, instance=0x5555562f7780, 
return_value=<optimized out>, closure=<optimized out>) at 
../../../gobject/gclosure.c:873
          marshal = <optimized out>
          marshal_data = <optimized out>
          in_marshal = 0
          real_closure = <optimized out>
          return_accu = <optimized out>
          accu = {g_type = 0x0, data = {{v_int = 0, v_uint = 0, v_long = 0, 
v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 
0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 
0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          accumulator = 0x0
          emission = Python Exception <class 'TypeError'> can only concatenate 
str (not "NoneType") to str:
  {next = 0x7fffffffd480, instance = 0x5555562f7780, ihint = {signal_id = 253, 
detail = 0, run_type = (G_SIGNAL_RUN_FIRST | G_SIGNAL_ACCUMULATOR_FIRST_RUN)}, 
state = EMISSION_RUN, chain_type = }
          signal_id = 253
          instance_type = <optimized out>
          emission_return = {g_type = 0x0, data = {{v_int = 0, v_uint = 0, 
v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, 
v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, 
v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          rtype = 0x4
          static_scope = 0
          fastpath_handler = <optimized out>
          closure = <optimized out>
          run_type = <optimized out>
          hlist = <optimized out>
          l = <optimized out>
          fastpath = 1
          instance_and_params = <optimized out>
          signal_return_type = <optimized out>
          param_values = <optimized out>
          node = <optimized out>
          i = <optimized out>
          n_params = <optimized out>
          __func__ = "g_signal_emit_valist"
  #18 g_signal_emit_valist (instance=0x5555562f7780, signal_id=<optimized out>, 
detail=<optimized out>, var_args=var_args@entry=0x7fffffffd260) at 
../../../gobject/gsignal.c:3406
          return_accu = <optimized out>
          accu = {g_type = 0x0, data = {{v_int = 0, v_uint = 0, v_long = 0, 
v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 
0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 
0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          accumulator = 0x0
          emission = Python Exception <class 'TypeError'> can only concatenate 
str (not "NoneType") to str:
  {next = 0x7fffffffd480, instance = 0x5555562f7780, ihint = {signal_id = 253, 
detail = 0, run_type = (G_SIGNAL_RUN_FIRST | G_SIGNAL_ACCUMULATOR_FIRST_RUN)}, 
state = EMISSION_RUN, chain_type = }
          signal_id = 253
          instance_type = <optimized out>
          emission_return = {g_type = 0x0, data = {{v_int = 0, v_uint = 0, 
v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, 
v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, 
v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          rtype = 0x4
          static_scope = 0
          fastpath_handler = <optimized out>
          closure = <optimized out>
          run_type = <optimized out>
          hlist = <optimized out>
          l = <optimized out>
          fastpath = 1
          instance_and_params = <optimized out>
          signal_return_type = <optimized out>
          param_values = <optimized out>
          node = <optimized out>
          i = <optimized out>
          n_params = <optimized out>
          __func__ = "g_signal_emit_valist"
  #19 0x00007ffff7d9c893 in g_signal_emit 
(instance=instance@entry=0x5555562f7780, signal_id=<optimized out>, 
detail=detail@entry=0) at ../../../gobject/gsignal.c:3553
          var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 
0x7fffffffd340, reg_save_area = 0x7fffffffd280}}
  #20 0x00007ffff75e6e4c in gtk_gesture_multi_press_end 
(gesture=gesture@entry=0x5555562f7780, sequence=sequence@entry=0x0) at 
../../../../gtk/gtkgesturemultipress.c:287
          multi_press = 0x5555562f7780
          priv = 0x5555562f76d0
          current = 0x0
          x = 313
          y = 121
          interpreted = 1
          state = <optimized out>
  #21 0x00007ffff7d832df in g_cclosure_marshal_VOID__BOXEDv 
(closure=0x555556123620, return_value=<optimized out>, instance=<optimized 
out>, args=<optimized out>, marshal_data=<optimized out>, n_params=<optimized 
out>, param_types=0x55555613bbf0) at ../../../gobject/gmarshal.c:1686
          data1 = 0x5555562f7780
          data2 = <optimized out>
          callback = 0x7ffff75e6da0 <gtk_gesture_multi_press_end>
          arg0 = 0x0
          args_copy = {{gp_offset = 32, fp_offset = 48, overflow_arg_area = 
0x7fffffffd660, reg_save_area = 0x7fffffffd5a0}}
  #22 0x00007ffff7d9c724 in _g_closure_invoke_va (param_types=0x55555613bbf0, 
n_params=1, args=0x7fffffffd580, instance=0x5555562f7780, 
return_value=<optimized out>, closure=<optimized out>) at 
../../../gobject/gclosure.c:873
          marshal = <optimized out>
          marshal_data = <optimized out>
          in_marshal = 0
          real_closure = <optimized out>
          return_accu = <optimized out>
          accu = {g_type = 0x0, data = {{v_int = 0, v_uint = 0, v_long = 0, 
v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 
0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 
0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          accumulator = 0x0
          emission = Python Exception <class 'TypeError'> can only concatenate 
str (not "NoneType") to str:
  {next = 0x7fffffffd870, instance = 0x5555562f7780, ihint = {signal_id = 248, 
detail = 0, run_type = (G_SIGNAL_RUN_LAST | G_SIGNAL_ACCUMULATOR_FIRST_RUN)}, 
state = EMISSION_RUN, chain_type = }
          signal_id = 248
          instance_type = <optimized out>
          emission_return = {g_type = 0x0, data = {{v_int = 0, v_uint = 0, 
v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, 
v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, 
v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          rtype = 0x4
          static_scope = 0
          fastpath_handler = <optimized out>
          closure = <optimized out>
          run_type = <optimized out>
          hlist = <optimized out>
          l = <optimized out>
          fastpath = 1
          instance_and_params = <optimized out>
          signal_return_type = <optimized out>
          param_values = <optimized out>
          node = <optimized out>
          i = <optimized out>
          n_params = <optimized out>
          __func__ = "g_signal_emit_valist"
  #23 g_signal_emit_valist (instance=0x5555562f7780, signal_id=<optimized out>, 
detail=<optimized out>, var_args=var_args@entry=0x7fffffffd580) at 
../../../gobject/gsignal.c:3406
          return_accu = <optimized out>
          accu = {g_type = 0x0, data = {{v_int = 0, v_uint = 0, v_long = 0, 
v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 
0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 
0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          accumulator = 0x0
          emission = Python Exception <class 'TypeError'> can only concatenate 
str (not "NoneType") to str:
  {next = 0x7fffffffd870, instance = 0x5555562f7780, ihint = {signal_id = 248, 
detail = 0, run_type = (G_SIGNAL_RUN_LAST | G_SIGNAL_ACCUMULATOR_FIRST_RUN)}, 
state = EMISSION_RUN, chain_type = }
          signal_id = 248
          instance_type = <optimized out>
          emission_return = {g_type = 0x0, data = {{v_int = 0, v_uint = 0, 
v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, 
v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, 
v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          rtype = 0x4
          static_scope = 0
          fastpath_handler = <optimized out>
          closure = <optimized out>
          run_type = <optimized out>
          hlist = <optimized out>
          l = <optimized out>
          fastpath = 1
          instance_and_params = <optimized out>
          signal_return_type = <optimized out>
          param_values = <optimized out>
          node = <optimized out>
          i = <optimized out>
          n_params = <optimized out>
          __func__ = "g_signal_emit_valist"
  #24 0x00007ffff7d9c893 in g_signal_emit 
(instance=instance@entry=0x5555562f7780, signal_id=<optimized out>, 
detail=detail@entry=0) at ../../../gobject/gsignal.c:3553
          var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 
0x7fffffffd660, reg_save_area = 0x7fffffffd5a0}}
  #25 0x00007ffff75de78b in _gtk_gesture_set_recognized (sequence=0x0, 
recognized=0, gesture=0x5555562f7780) at ../../../../gtk/gtkgesture.c:346
          priv = <optimized out>
          priv = 0x5555562f7730
          has_matching_touchpoints = 0
  #26 _gtk_gesture_check_recognized (gesture=gesture@entry=0x5555562f7780, 
sequence=sequence@entry=0x0) at ../../../../gtk/gtkgesture.c:387
          priv = 0x5555562f7730
          has_matching_touchpoints = 0
  #27 0x00007ffff75e668b in gtk_gesture_handle_event (event=0x555556402a80, 
controller=0x5555562f7780) at ../../../../gtk/gtkgesture.c:778
          was_recognized = 1
          sequence = 0x0
          priv = 0x5555562f7730
          gesture = 0x5555562f7780
          source_device = <optimized out>
  #28 gtk_gesture_handle_event (controller=0x5555562f7780, 
event=0x555556402a80) at ../../../../gtk/gtkgesture.c:713
          gesture = 0x5555562f7780
          source_device = <optimized out>
  #29 0x00007ffff75e7293 in gtk_gesture_single_handle_event 
(controller=0x5555562f7780, event=0x555556402a80) at 
../../../../gtk/gtkgesturesingle.c:222
          sequence = <optimized out>
          priv = 0x5555562f7710
          source_device = <optimized out>
          source = GDK_SOURCE_MOUSE
          button = <optimized out>
          i = <optimized out>
          retval = <optimized out>
          test_touchscreen = <optimized out>
  #30 0x00007ffff75adec0 in gtk_event_controller_handle_event 
(controller=0x5555562f7780, event=0x555556402a80) at 
../../../../gtk/gtkeventcontroller.c:230
          controller_class = 0x555556137fa0
          retval = 0
          __func__ = "gtk_event_controller_handle_event"
  #31 0x00007ffff7781405 in _gtk_widget_run_controllers (widget=0x555556396200, 
event=0x555556402a80, phase=GTK_PHASE_BUBBLE) at 
../../../../gtk/gtkwidget.c:7443
          controller_phase = <optimized out>
          next = 0x0
          data = 0x555556395120
          handled = 0
          priv = 0x555556396110
          l = <optimized out>
  #32 0x00007ffff77c8898 in _gtk_marshal_BOOLEAN__BOXEDv 
(closure=0x555555b69280, return_value=0x7fffffffd8c0, instance=<optimized out>, 
args=<optimized out>, marshal_data=<optimized out>, n_params=<optimized out>, 
param_types=0x555555b8a420) at gtkmarshalers.c:129
          data1 = 0x555556396200
          data2 = <optimized out>
          callback = 0x7ffff7781730 <gtk_widget_real_button_event>
          v_return = <optimized out>
          arg0 = 0x555556402a80
          args_copy = {{gp_offset = 32, fp_offset = 48, overflow_arg_area = 
0x7fffffffda50, reg_save_area = 0x7fffffffd990}}
          __func__ = "_gtk_marshal_BOOLEAN__BOXEDv"
  #33 0x00007ffff7d9c724 in _g_closure_invoke_va (param_types=0x555555b8a420, 
n_params=1, args=0x7fffffffd970, instance=0x555556396200, 
return_value=<optimized out>, closure=<optimized out>) at 
../../../gobject/gclosure.c:873
          marshal = <optimized out>
          marshal_data = <optimized out>
          in_marshal = 0
          real_closure = <optimized out>
          return_accu = <optimized out>
          accu = {g_type = 0x14, data = {{v_int = 0, v_uint = 0, v_long = 0, 
v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 
0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 
0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          accumulator = 0x555555bc8470
          emission = Python Exception <class 'TypeError'> can only concatenate 
str (not "NoneType") to str:
  {next = 0x0, instance = 0x555556396200, ihint = {signal_id = 94, detail = 0, 
run_type = (G_SIGNAL_RUN_LAST | G_SIGNAL_ACCUMULATOR_FIRST_RUN)}, state = 
EMISSION_RUN, chain_type = }
          signal_id = 94
          instance_type = <optimized out>
          emission_return = {g_type = 0x14, data = {{v_int = 0, v_uint = 0, 
v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, 
v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, 
v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          rtype = 0x14
          static_scope = 0
          fastpath_handler = <optimized out>
          closure = <optimized out>
          run_type = <optimized out>
          hlist = <optimized out>
          l = <optimized out>
          fastpath = 1
          instance_and_params = <optimized out>
          signal_return_type = <optimized out>
          param_values = <optimized out>
          node = <optimized out>
          i = <optimized out>
          n_params = <optimized out>
          __func__ = "g_signal_emit_valist"
  #34 g_signal_emit_valist (instance=0x555556396200, signal_id=<optimized out>, 
detail=<optimized out>, var_args=var_args@entry=0x7fffffffd970) at 
../../../gobject/gsignal.c:3406
          return_accu = <optimized out>
          accu = {g_type = 0x14, data = {{v_int = 0, v_uint = 0, v_long = 0, 
v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 
0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 
0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          accumulator = 0x555555bc8470
          emission = Python Exception <class 'TypeError'> can only concatenate 
str (not "NoneType") to str:
  {next = 0x0, instance = 0x555556396200, ihint = {signal_id = 94, detail = 0, 
run_type = (G_SIGNAL_RUN_LAST | G_SIGNAL_ACCUMULATOR_FIRST_RUN)}, state = 
EMISSION_RUN, chain_type = }
          signal_id = 94
          instance_type = <optimized out>
          emission_return = {g_type = 0x14, data = {{v_int = 0, v_uint = 0, 
v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, 
v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, 
v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
          rtype = 0x14
          static_scope = 0
          fastpath_handler = <optimized out>
          closure = <optimized out>
          run_type = <optimized out>
          hlist = <optimized out>
          l = <optimized out>
          fastpath = 1
          instance_and_params = <optimized out>
          signal_return_type = <optimized out>
          param_values = <optimized out>
          node = <optimized out>
          i = <optimized out>
          n_params = <optimized out>
          __func__ = "g_signal_emit_valist"
  #35 0x00007ffff7d9c893 in g_signal_emit 
(instance=instance@entry=0x555556396200, signal_id=<optimized out>, 
detail=detail@entry=0) at ../../../gobject/gsignal.c:3553
          var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 
0x7fffffffda50, reg_save_area = 0x7fffffffd990}}
  #36 0x00007ffff778fb44 in gtk_widget_event_internal.part.0.lto_priv.0 
(widget=0x555556396200, event=0x555556402a80) at 
../../../../gtk/gtkwidget.c:7808
          signal_num = <optimized out>
          return_val = <optimized out>
          handled = 0
  #37 0x00007ffff7631240 in propagate_event_up (topmost=<optimized out>, 
event=<optimized out>, widget=0x555556396200) at ../../../../gtk/gtkmain.c:2598
          tmp = <optimized out>
          handled_event = <optimized out>
          handled_event = 0
  #38 propagate_event (widget=widget@entry=0x555556396200, 
event=event@entry=0x555556402a80, captured=captured@entry=0, 
topmost=topmost@entry=0x0) at ../../../../gtk/gtkmain.c:2701
          handled_event = 0
  #39 0x00007ffff7631373 in gtk_propagate_event 
(widget=widget@entry=0x555556396200, event=event@entry=0x555556402a80) at 
../../../../gtk/gtkmain.c:2735
          __func__ = "gtk_propagate_event"
  #40 0x00007ffff76324fb in gtk_main_do_event (event=0x555556402a80) at 
../../../../gtk/gtkmain.c:1921
          grab_widget = 0x555556396200
          window_group = 0x7fffe0041cb0
          rewritten_event = <optimized out>
          device = <optimized out>
          tmp_list = <optimized out>
          event_widget = <optimized out>
          topmost_widget = <optimized out>
          __func__ = "gtk_main_do_event"
  #41 gtk_main_do_event (event=<optimized out>) at 
../../../../gtk/gtkmain.c:1691
          __func__ = "gtk_main_do_event"
  #42 0x00007ffff7313753 in _gdk_event_emit (event=0x555556402a80) at 
../../../../gdk/gdkevents.c:73
  #43 _gdk_event_emit (event=0x555556402a80) at ../../../../gdk/gdkevents.c:67
  #44 0x00007ffff737a356 in gdk_event_source_dispatch (base=<optimized out>, 
callback=<optimized out>, data=<optimized out>) at 
wayland/../../../../../gdk/wayland/gdkeventsource.c:124
          source = <optimized out>
          display = <optimized out>
          event = 0x555556402a80
  #45 0x00007ffff7c8a8eb in g_main_dispatch (context=0x555555ac5000) at 
../../../glib/gmain.c:3337
          dispatch = 0x7ffff737a330 <gdk_event_source_dispatch>
          prev_source = 0x0
          begin_time_nsec = 0
          was_in_call = 0
          user_data = 0x0
          callback = 0x0
          cb_funcs = <optimized out>
          cb_data = <optimized out>
          need_destroy = <optimized out>
          source = 0x555555ad9990
          current = 0x555555ac2fe0
          i = 0
  #46 g_main_context_dispatch (context=0x555555ac5000) at 
../../../glib/gmain.c:4055
  #47 0x00007ffff7cddd28 in g_main_context_iterate.constprop.0 
(context=context@entry=0x555555ac5000, block=block@entry=1, 
dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4131
          max_priority = 2147483647
          timeout = 399
          some_ready = 1
          nfds = <optimized out>
          allocated_nfds = <optimized out>
          fds = 0x55555633f2d0
  #48 0x00007ffff7c88023 in g_main_context_iteration 
(context=context@entry=0x555555ac5000, may_block=may_block@entry=1) at 
../../../glib/gmain.c:4196
          retval = <optimized out>
  #49 0x00007ffff7ea227d in g_application_run (application=0x5555560576f0, 
argc=-8988, argc@entry=1, argv=argv@entry=0x7fffffffde58) at 
../../../gio/gapplication.c:2560
          arguments = 0x555556115130
          status = 0
          context = 0x555555ac5000
          acquired_context = <optimized out>
          __func__ = "g_application_run"
  #50 0x00005555555b6b48 in main (argc=<optimized out>, argv=<optimized out>) 
at ../shell/main.c:65
          application = 0x5555560576f0

  Here are the versions of the relevant packages:

  gnome-control-center      1:40.0-1ubuntu1   amd64
  libglib2.0-0            2.68.1-2          amd64
  libglib2.0-0            2.68.1-2          i386
  libgnome-desktop-3-19   3.38.5-1ubuntu3   amd64
  libgtk-3-0              3.24.29-1ubuntu1  amd64
  libgtk-3-0              3.24.29-1ubuntu1  i386

  And this is not like that using the latest(not yet in main impish
  repo) pacakges and being in the Development Branch is causing the
  issue, as I already mentioned earlier. I just changed over to the
  Development branch for only 3 months now.

  I am also thinking of raising an issue on this on gnome GitLab.
  And for the time being, how can I get around this and add some Input Sources 
by, I don't know, changing some user configs?

  Appreciate your help in advance

To manage notifications about this bug go to:
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