#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
  [Error: raise.c was not found in source tree]
#1  0x00007ff4c5238801 in __GI_abort () at abort.c:79
  [Error: abort.c was not found in source tree]
#2  0x00007ff4c522839a in __assert_fail_base (fmt=0x7ff4bb8cb622 <error: Cannot access memory at address 0x7ff4bb8cb622>, assertion=assertion@entry=0x7ff4bfdf9660 "!xcb_xlib_threads_sequence_lost", file=file@entry=0x7ff4bfdf94cb "../../src/xcb_io.c", line=line@entry=259, function=function@entry=0x7ff4bfdf9908 <__PRETTY_FUNCTION__.14350> "poll_for_event") at assert.c:92
  [Error: assert.c was not found in source tree]
#3  0x00007ff4c5228412 in __GI___assert_fail (assertion=assertion@entry=0x7ff4bfdf9660 "!xcb_xlib_threads_sequence_lost", file=file@entry=0x7ff4bfdf94cb "../../src/xcb_io.c", line=line@entry=259, function=function@entry=0x7ff4bfdf9908 <__PRETTY_FUNCTION__.14350> "poll_for_event") at assert.c:101
  [Error: assert.c was not found in source tree]
#4  0x00007ff4bfd871da in poll_for_event (dpy=dpy@entry=0x2675000) at ../../src/xcb_io.c:256
  [Error: xcb_io.c was not found in source tree]
#5  0x00007ff4bfd8728b in poll_for_response (dpy=dpy@entry=0x2675000) at ../../src/xcb_io.c:274
  [Error: xcb_io.c was not found in source tree]
#6  0x00007ff4bfd8757d in _XEventsQueued (dpy=dpy@entry=0x2675000, mode=mode@entry=2) at ../../src/xcb_io.c:349
  [Error: xcb_io.c was not found in source tree]
#7  0x00007ff4bfd79237 in XPending (dpy=0x2675000) at ../../src/Pending.c:55
  [Error: Pending.c was not found in source tree]
#8  0x00007ff4c1ff5351 in gdk_check_xpending (display=<optimized out>) at ../../../../../gdk/x11/gdkeventsource.c:269
  [Error: gdkeventsource.c was not found in source tree]
#9  gdk_event_source_check (source=0x26b9ee0) at ../../../../../gdk/x11/gdkeventsource.c:306
  [Error: gdkeventsource.c was not found in source tree]
#10 0x00007ff4c41f5e51 in g_main_context_check (context=context@entry=0x2568a00, max_priority=2147483647, fds=fds@entry=0x2db8270, n_fds=n_fds@entry=4) at ../../../../glib/gmain.c:3736
  [Error: gmain.c was not found in source tree]
#11 0x00007ff4c41f63e0 in g_main_context_iterate (context=context@entry=0x2568a00, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../../glib/gmain.c:3900
  [Error: gmain.c was not found in source tree]
#12 0x00007ff4c41f654c in g_main_context_iteration (context=context@entry=0x2568a00, may_block=may_block@entry=1) at ../../../../glib/gmain.c:3964
  [Error: gmain.c was not found in source tree]
#13 0x00007ff4c3aa2d2d in g_application_run (application=0x26bb240, argc=<optimized out>, argv=<optimized out>) at ../../../../gio/gapplication.c:2470
  [Error: gapplication.c was not found in source tree]
#14 0x00007ff4c3fa7dae in ffi_call_unix64 () at ../src/x86/unix64.S:76
  [Error: unix64.S was not found in source tree]
#15 0x00007ff4c3fa771f in ffi_call (cif=cif@entry=0x29a7508, fn=<optimized out>, rvalue=<optimized out>, rvalue@entry=0x7ffc1c3f40f8, avalue=<optimized out>) at ../src/x86/ffi64.c:525
  [Error: ffi64.c was not found in source tree]
#16 0x00007ff4c4973dda in pygi_invoke_c_callable (function_cache=0x29a7460, state=<optimized out>, py_args=<optimized out>, py_kwargs=<optimized out>) at ../../gi/pygi-invoke.c:682
  [Error: pygi-invoke.c was not found in source tree]
#17 0x00007ff4c49759b8 in pygi_function_cache_invoke (function_cache=<optimized out>, py_args=py_args@entry=0x7ff4b735bcc8, py_kwargs=<optimized out>) at ../../gi/pygi-cache.c:863
  [Error: pygi-cache.c was not found in source tree]
#18 0x00007ff4c4974648 in pygi_callable_info_invoke (info=<optimized out>, py_args=py_args@entry=0x7ff4b735bcc8, kwargs=<optimized out>, cache=<optimized out>, user_data=user_data@entry=0x0) at ../../gi/pygi-invoke.c:725
  [Error: pygi-invoke.c was not found in source tree]
#19 0x00007ff4c497467f in _wrap_g_callable_info_invoke (self=<optimized out>, py_args=py_args@entry=0x7ff4b735bcc8, kwargs=<optimized out>) at ../../gi/pygi-invoke.c:762
  [Error: pygi-invoke.c was not found in source tree]
#20 0x00007ff4c4969c29 in _callable_info_call (self=0x7ff4b72d8880, args=0x7ff4c4d0e6a0, kwargs=0x0) at ../../gi/pygi-info.c:561
  [Error: pygi-info.c was not found in source tree]
#21 0x000000000045a0e3 in _PyObject_FastCallDict (func=0x7ff4b72d8880, args=0x24dcbe8, nargs=1, kwargs=0x0) at ../Objects/abstract.c:2331
  [Error: abstract.c was not found in source tree]
#22 0x000000000054fd37 in call_function (pp_stack=pp_stack@entry=0x7ffc1c3f4328, oparg=<optimized out>, kwnames=kwnames@entry=0x0) at ../Python/ceval.c:4848
  [Error: ceval.c was not found in source tree]
#23 0x00000000005546cf in _PyEval_EvalFrameDefault (f=<optimized out>, throwflag=<optimized out>) at ../Python/ceval.c:3322
  [Error: ceval.c was not found in source tree]
#24 0x000000000054fbe1 in PyEval_EvalFrameEx (throwflag=0, f=0x24dca68) at ../Python/ceval.c:753
  [Error: ceval.c was not found in source tree]
#25 _PyEval_EvalCodeWithName (_co=_co@entry=0x7ff4c64f95d0, globals=globals@entry=0x7ff4c64f95d0, locals=locals@entry=0x7ff4c6596270, args=args@entry=0x0, argcount=argcount@entry=0, kwnames=kwnames@entry=0x0, kwargs=0x0, kwcount=0, kwstep=2, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0, name=0x0, qualname=0x0) at ../Python/ceval.c:4153
  [Error: ceval.c was not found in source tree]
#26 0x0000000000550b93 in PyEval_EvalCodeEx (closure=0x0, kwdefs=0x0, defcount=0, defs=0x0, kwcount=0, kws=0x0, argcount=0, args=0x0, locals=locals@entry=0x7ff4c6596270, globals=globals@entry=0x7ff4c64f95d0, _co=_co@entry=0x7ff4c64f95d0) at ../Python/ceval.c:4174
  [Error: ceval.c was not found in source tree]
#27 PyEval_EvalCode (co=co@entry=0x7ff4c64f95d0, globals=globals@entry=0x7ff4c657c2d0, locals=locals@entry=0x7ff4c657c2d0) at ../Python/ceval.c:730
  [Error: ceval.c was not found in source tree]
#28 0x000000000042b519 in run_mod (arena=0x7ff4c6596270, flags=0x7ffc1c3f463c, locals=0x7ff4c657c2d0, globals=0x7ff4c657c2d0, filename=0x7ff4c4ce5be0, mod=0x24d7140) at ../Python/pythonrun.c:1025
  [Error: pythonrun.c was not found in source tree]
#29 PyRun_FileExFlags (fp=0x2544e90, filename_str=<optimized out>, start=<optimized out>, globals=0x7ff4c657c2d0, locals=0x7ff4c657c2d0, closeit=1, flags=0x7ffc1c3f463c) at ../Python/pythonrun.c:978
  [Error: pythonrun.c was not found in source tree]
#30 0x000000000042b705 in PyRun_SimpleFileExFlags (fp=0x2544e90, filename=<optimized out>, closeit=1, flags=0x7ffc1c3f463c) at ../Python/pythonrun.c:420
  [Error: pythonrun.c was not found in source tree]
#31 0x0000000000441fcb in run_file (p_cf=0x7ffc1c3f463c, filename=0x2495650 L"/usr/bin/gnome-language-selector", fp=0x2544e90) at ../Modules/main.c:340
  [Error: main.c was not found in source tree]
#32 Py_Main (argc=argc@entry=2, argv=argv@entry=0x2494260) at ../Modules/main.c:810
  [Error: main.c was not found in source tree]
#33 0x0000000000421ff4 in main (argc=2, argv=<optimized out>) at ../Programs/python.c:69
  [Error: python.c was not found in source tree]