Hello,

I get a segmentation fault when trying to plot a loop with
graphviz_draw(). Here is a minimal example to reproduce the error:

import graph_tool.all as gt
g = gt.Graph()
v0 = g.add_vertex()
v1 = g.add_vertex()
e01 = g.add_edge(v0,v1)
e11 = g.add_edge(v1,v1) # loop
gt.graphviz_draw(g)

I have version 2.33 of python3-graph-tool installed on my computer which
runs on Linux Mint 19.2 Tina (based on Ubuntu 18.04 LTS, bionic). My
graphviz version is 2.40.1-2.

It works fine if I don't add the loop e11 to the graph.

It works fine if I use gt.graph_draw() instead of gt.graphviz_draw()

It works fine if I use graphviz directly (via a .dot file).

It did work fine in earlier versions of graph_tool.

Can anyone reproduce this?

Best regards
Rolf

--
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   Rolf Sander                              phone: [+49] 6131/305-4610
   Max-Planck Institute of Chemistry        email: rolf.sander@mpic.de
   PO Box 3060, 55020 Mainz, Germany     homepage: www.rolf-sander.net
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