GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu"...
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(gdb) handle SIG33 pass nostop noprint
Signal        Stop	Print	Pass to program	Description
SIG33         No	No	Yes		Real-time event 33
(gdb) set pagination 0
(gdb) break gdk_x_error
Function "gdk_x_error" not defined.
Make breakpoint pending on future shared library load? (y or [n]) Breakpoint 1 (gdk_x_error) pending.
(gdb) run --sync
Starting program: /usr/bin/gnome-settings-daemon --sync
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[Thread debugging using libthread_db enabled]
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[New Thread 0x7f3ca8bc2780 (LWP 19205)]
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Xlib:  extension "Generic Event Extension" missing on display ":1001.0".
Xlib:  extension "Generic Event Extension" missing on display ":1001.0".
Xlib:  extension "Generic Event Extension" missing on display ":1001.0".
Xlib:  extension "Generic Event Extension" missing on display ":1001.0".
Xlib:  extension "Generic Event Extension" missing on display ":1001.0".

** (gnome-settings-daemon:19208): WARNING **: Unable to start xrandr manager: unhandled X error while getting the range of screen sizes

Program exited normally.
(gdb) The program 'gnome-settings-daemon' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadClass, invalid event class'.
  (Details: serial 221 error_code 133 request_code 131 minor_code 6)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)

(gdb) q