Same setup as before.<br /><br />(gdb) break x_error_quitter<br />(gdb) run -Q -nw -xrm &quot;emacs.synchronous: true&quot; -f server-start<br /><br />Breakpoint 3, x_error_quitter (display=0xfd7720, event=0x7fffffff9ac0) at xterm.c:7732<br />7732    {<br />(gdb) bt<br />#0  x_error_quitter (display=0xfd7720, event=0x7fffffff9ac0) at xterm.c:7732<br />#1  0x0000000000542209 in x_error_handler (display=0xfd7720, event=0x7fffffff9ac0) at xterm.c:7717<br />#2  0x00007ffff5fbb54b in _XError (dpy=dpy@entry=0xfd7720, rep=rep@entry=0xf97e30) at ../../src/XlibInt.c:1463<br />#3  0x00007ffff5fb85e7 in handle_error (dpy=0xfd7720, err=0xf97e30, in_XReply=&lt;optimized out&gt;) at ../../src/xcb_io.c:213<br />#4  0x00007ffff5fb8695 in handle_response (dpy=dpy@entry=0xfd7720, response=0xf97e30, in_XReply=in_XReply@entry=1) at ../../src/xcb_io.c:325<br />#5  0x00007ffff5fb9578 in _XReply (dpy=dpy@entry=0xfd7720, rep=rep@entry=0x7fffffff9c80, extra=extra@entry=0, discard=discard@entry=0) at ../../src/xcb_io.c:627<br />#6  0x00007ffff5faf4cf in XQueryColor (dpy=0xfd7720, cmap=32, def=0x7fffffff9ce0) at ../../src/QuColor.c:49<br />#7  0x00007ffff6b8c50c in Xaw3dComputeTopShadowRGB () from /usr/lib/x86_64-linux-gnu/libXaw3d.so.6<br />#8  0x00007ffff6b8c600 in ?? () from /usr/lib/x86_64-linux-gnu/libXaw3d.so.6<br />#9  0x00007ffff6b8ca6a in ?? () from /usr/lib/x86_64-linux-gnu/libXaw3d.so.6<br />#10 0x00007ffff66f1afc in CallInitialize (class=0x7ffff6dae960 &lt;threeDClassRec&gt;, req_widget=req_widget@entry=0x7fffffff9ef0, new_widget=new_widget@entry=0x1655210, args=args@entry=0x7fffffffa3c0, <br />    num_args=3) at ../../src/Create.c:226<br />#11 0x00007ffff66f1ac6 in CallInitialize (class=0x7ffff6dac1c0 &lt;scrollbarClassRec&gt;, req_widget=req_widget@entry=0x7fffffff9ef0, new_widget=new_widget@entry=0x1655210, args=args@entry=0x7fffffffa3c0, <br />    num_args=num_args@entry=3) at ../../src/Create.c:221<br />#12 0x00007ffff66f2427 in xtCreate (name=name@entry=0x703028 &quot;verticalScrollBar&quot;, class=class@entry=0x0, widget_class=widget_class@entry=0x7ffff6dac1c0 &lt;scrollbarClassRec&gt;, parent=parent@entry=0xff6940, <br />    default_screen=0xfb5cb0, args=args@entry=0x7fffffffa3c0, num_args=num_args@entry=3, typed_args=typed_args@entry=0x0, num_typed_args=num_typed_args@entry=0, parent_constraint_class=0x0, <br />    post_proc=post_proc@entry=0x7ffff66f1b40 &lt;widgetPostProc&gt;) at ../../src/Create.c:416<br />#13 0x00007ffff66f2840 in _XtCreateWidget (name=name@entry=0x703028 &quot;verticalScrollBar&quot;, widget_class=widget_class@entry=0x7ffff6dac1c0 &lt;scrollbarClassRec&gt;, parent=parent@entry=0xff6940, <br />    args=args@entry=0x7fffffffa3c0, num_args=num_args@entry=3, typed_args=typed_args@entry=0x0, num_typed_args=num_typed_args@entry=0) at ../../src/Create.c:570<br />#14 0x00007ffff66f2b0e in XtCreateWidget (name=0x703028 &quot;verticalScrollBar&quot;, widget_class=0x7ffff6dac1c0 &lt;scrollbarClassRec&gt;, parent=0xff6940, args=0x7fffffffa3c0, num_args=3) at ../../src/Create.c:589<br />#15 0x000000000053c417 in x_create_toolkit_scroll_bar (f=0xffed38, bar=0x134e3b8) at xterm.c:4768<br />#16 0x000000000053c937 in x_scroll_bar_create (w=0x13b0940, top=686, left=1, width=16, height=19) at xterm.c:4960<br />#17 0x000000000053d167 in XTset_vertical_scroll_bar (w=0x13b0940, portion=0, whole=0, position=0) at xterm.c:5205<br />#18 0x000000000046b064 in set_vertical_scroll_bar (w=0x13b0940) at xdisp.c:15905<br />#19 0x000000000046fcfa in redisplay_window (window=..., just_this_one_p=false) at xdisp.c:16947<br />#20 0x00000000004644f2 in redisplay_window_0 (window=...) at xdisp.c:14373<br />#21 0x00000000006173df in internal_condition_case_1 (bfun=0x4644b0 &lt;redisplay_window_0&gt;, arg=..., handlers=..., hfun=0x46447f &lt;redisplay_window_error&gt;) at eval.c:1372<br />#22 0x000000000046445d in redisplay_windows (window=...) at xdisp.c:14353<br />#23 0x0000000000463204 in redisplay_internal () at xdisp.c:13949<br />#24 0x0000000000463db4 in redisplay_preserve_echo_area (from_where=12) at xdisp.c:14206<br />#25 0x0000000000674157 in wait_reading_process_output (time_limit=30, nsecs=0, read_kbd=-1, do_display=true, wait_for_cell=..., wait_proc=0x0, just_wait_proc=0) at process.c:4821<br />#26 0x0000000000422d0c in sit_for (timeout=..., reading=true, display_option=1) at dispnew.c:5867<br />#27 0x0000000000576bff in read_char (commandflag=1, map=..., prev_event=..., used_mouse_menu=0x7fffffffd7c5, end_time=0x0) at keyboard.c:2810<br />#28 0x00000000005858f4 in read_key_sequence (keybuf=0x7fffffffd9f0, bufsize=30, prompt=..., dont_downcase_last=false, can_return_switch_frame=true, fix_current_buffer=true, prevent_redisplay=false)<br />    at keyboard.c:9089<br />#29 0x0000000000573161 in command_loop_1 () at keyboard.c:1453<br />#30 0x000000000061726e in internal_condition_case (bfun=0x572d8a &lt;command_loop_1&gt;, handlers=..., hfun=0x57253d &lt;cmd_error&gt;) at eval.c:1348<br />#31 0x0000000000572a28 in command_loop_2 (ignore=...) at keyboard.c:1178<br />#32 0x00000000006166f1 in internal_catch (tag=..., func=0x572a05 &lt;command_loop_2&gt;, arg=...) at eval.c:1112<br />#33 0x00000000005729dc in command_loop () at keyboard.c:1157<br />#34 0x0000000000572069 in recursive_edit_1 () at keyboard.c:778<br />#35 0x0000000000572239 in Frecursive_edit () at keyboard.c:849<br />#36 0x000000000057017b in main (argc=7, argv=0x7fffffffddb8) at emacs.c:1642<br /><br />Lisp Backtrace:<br />&quot;redisplay_internal (C function)&quot; (0xd553f0)<br /><br />(gdb) print event<br />$1 = (XErrorEvent *) 0x7fffffff9ac0<br /><br />(gdb) print *event<br />$2 = {<br />  type = 0, <br />  display = 0xfd7720, <br />  resourceid = 0, <br />  serial = 1942, <br />  error_code = 4 '\004', <br />  request_code = 55 '7', <br />  minor_code = 0 '\000'<br />}<br /><br />