Triangulation failed
Rendering the file linear-err-adf.dot (14k) gives the following error:
bash-3.2$ dot linear-err-adf.dot -Tpdf -o linear-err-adf.pdf
libpath/shortest.c:324: triangulation failed
libpath/shortest.c:200: destination point not in any triangle
Error: in routesplines, Pshortestpath failed
Segmentation fault: 11
bash-3.2$ dot -V
dot - graphviz version 2.38.0 (20140413.2041)
bash-3.2$