$ xvfb-run -a -e /dev/stderr -s "-extension GLX" true
xauth: creating new authority file /tmp/xvfb-run.KG5sTU/Xauthority
[dix] Could not init font path element /usr/share/fonts/X11/cyrillic, removing from list!
[dix] Could not init font path element /usr/share/fonts/X11/100dpi/:unscaled, removing from list!
[dix] Could not init font path element /usr/share/fonts/X11/75dpi/:unscaled, removing from list!
[dix] Could not init font path element /usr/share/fonts/X11/Type1, removing from list!
[dix] Could not init font path element /usr/share/fonts/X11/100dpi, removing from list!
[dix] Could not init font path element /usr/share/fonts/X11/75dpi, removing from list!
$ echo $?
1
Expected:
$ xvfb-run -a -e /dev/stderr -s "-extension GLX" true
xauth: creating new authority file /tmp/xvfb-run.t1oX3v/Xauthority
[dix] Could not init font path element /usr/share/fonts/X11/cyrillic, removing from list!
[dix] Could not init font path element /usr/share/fonts/X11/100dpi/:unscaled, removing from list!
[dix] Could not init font path element /usr/share/fonts/X11/75dpi/:unscaled, removing from list!
[dix] Could not init font path element /usr/share/fonts/X11/Type1, removing from list!
[dix] Could not init font path element /usr/share/fonts/X11/100dpi, removing from list!
[dix] Could not init font path element /usr/share/fonts/X11/75dpi, removing from list!
$ echo $?
0
$ xvfb-run -a -e /dev/stderr -s "-extension GLX" true run.KG5sTU/ Xauthority fonts/X11/ cyrillic, removing from list! fonts/X11/ 100dpi/ :unscaled, removing from list! fonts/X11/ 75dpi/: unscaled, removing from list! fonts/X11/ Type1, removing from list! fonts/X11/ 100dpi, removing from list! fonts/X11/ 75dpi, removing from list!
xauth: creating new authority file /tmp/xvfb-
[dix] Could not init font path element /usr/share/
[dix] Could not init font path element /usr/share/
[dix] Could not init font path element /usr/share/
[dix] Could not init font path element /usr/share/
[dix] Could not init font path element /usr/share/
[dix] Could not init font path element /usr/share/
$ echo $?
1
Expected: run.t1oX3v/ Xauthority fonts/X11/ cyrillic, removing from list! fonts/X11/ 100dpi/ :unscaled, removing from list! fonts/X11/ 75dpi/: unscaled, removing from list! fonts/X11/ Type1, removing from list! fonts/X11/ 100dpi, removing from list! fonts/X11/ 75dpi, removing from list!
$ xvfb-run -a -e /dev/stderr -s "-extension GLX" true
xauth: creating new authority file /tmp/xvfb-
[dix] Could not init font path element /usr/share/
[dix] Could not init font path element /usr/share/
[dix] Could not init font path element /usr/share/
[dix] Could not init font path element /usr/share/
[dix] Could not init font path element /usr/share/
[dix] Could not init font path element /usr/share/
$ echo $?
0