Illegal instruction when changing node shape - graphviz

Question

I followed the instructions here to change the default node shape: How to set default node shape to box instead of oval?
Input file:
digraph Blah {
rankdir="LR"
node [shape="box"];
A -> B -> C;
B -> D;
}
I then use the command dot -v -Txdot gt.dot > gt.xdot.
Output (verbose):
dot - graphviz version 2.44.0 ()
libdir = "/usr/lib/graphviz"
Activated plugin library: libgvplugin_core.so.6
Using render: xdot:core
Using device: xdot:xdot:core
Activated plugin library: libgvplugin_dot_layout.so.6
Using layout: dot:dot_layout
The plugin configuration file:
/usr/lib/graphviz/config6
was successfully loaded.
render : cairo dot dot_json fig json json0 map mp pic pov ps svg tk visio vml xdot xdot_json
layout : circo dot fdp neato nop nop1 nop2 osage patchwork sfdp twopi
textlayout : textlayout
device : canon cmap cmapx cmapx_np dot dot_json eps fig gv imap imap_np ismap json json0 mp pdf pic plain plain-ext png pov ps ps2 svg svgz tk vdx vml vmlz x11 xdot xdot1.2 xdot1.4 xdot_json xlib
loadimage : (lib) eps gif jpe jpeg jpg png ps svg
pack info:
mode undefined
size 0
flags 0
margin 8
pack info:
mode node
size 0
flags 0
fontname: "Times-Roman" resolved to: (ps:pango FreeSerif, REGULAR) (PangoCairoFcFont) "FreeSerif, Regular" /root/.fonts/FreeSerif.otf
Illegal instruction
But, when I remove the node [shape="box"]; line, it works. What am I doing wrong?

Answer 1

[this file worked correctly on my linux system with two versions of Graphviz]
You aren't doing anything wrong, but your font library info may be messed up?
/root/.fonts seems like a weird place for fonts.
What is the -v output when you use the default node shape? Does it still reference /root/.fonts?