xfwm4 segfaults when switching themes as root user

[Jeffery Wilkins]

I need help with capturing a gdb backtrace because when you switch themes all the windows become unresponsive meaning I can not click into the terminal to type "bt full"

steps to reproduce this bug is self explained

be running Xubuntu or XFCE Session
open a terminal and do "sudo gtk-theme-switch2"
pick any theme you like
apport will complain that xfwm4 has crashed

how to try with gdb....

open up a terminal and do ps aux | grep xfwm4 to get the full command with all the args including the display number and a unique id so take the command and copy it into the clipboard
now to prevent xfwm4 from restarting go into xubuntu settings under session and startup head over to the session tab and you should see a PID number of the running xfwm4 which you copied the command from change the restart style to "NONE" do not panic this is only a temp change when you restart your PC it will reset back to default setting
next have a terminal window open standing by with $ gdb xfwm4 and press enter
in a 2nd terminal kill the PID of the running xfwm4
now at the (gdb) prompt in the 1st terminal just type r and press enter the window manager should be running now
try and reproduce the bug and when it segfaults you should be back at a (gdb) prompt
this is where I get stuck

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gtk-theme-switch 2.1.0-5
ProcVersionSignature: Ubuntu 3.19.0-28.30~14.04.1-generic 3.19.8-ckt5
Uname: Linux 3.19.0-28-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.19.2-0ubuntu8
Architecture: amd64
Date: Thu Dec 3 22:02:06 2015
SourcePackage: gtk-theme-switch
UpgradeStatus: No upgrade log present (probably fresh install)