I tracked this down and I believe the issue is related to the
interpretation of the global variables Agdirected and Agundirected from
libgvc. If you replace lines 75 and 76 of graphviz_draw.py from:
libgv_directed = libgv.Agdirected libgv_undirected =
libgv.Agundirected
to:
libgv_directed = ctypes.c_int.in_dll(libgv, "Agdirected")
libgv_undirected = ctypes.c_int.in_dll(libgv, "Agundirected")
these values are interpreted correctly (as bit fields, not function
pointers) and the test case works again.
Best,
Jeff
On Mon, Aug 17, 2020 at 8:54 AM Tiago de Paula Peixoto <ti...@skewed.de>
wrote:
> I can also reproduce this, but this code has not been changed in several
> years.
>
> I consider graphviz_draw() to be largely deprecated (in favor of
> graph_draw()), since the graphviz interface is fairly buggy and
> inconvenient.
>
> I'm planning to remove this function altogether in new releases, and I'm
> not very inclined to debug it.
>
> Best,
> Tiago
>
> Am 17.08.20 um 17:44 schrieb Jeff Trull:
> > I can reproduce this.
> >
> > On Mon, Aug 17, 2020 at 1:29 AM Rolf Sander <rolf.san...@mpic.de
> > <mailto:rolf.san...@mpic.de>> wrote:
> >
> > 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
> >
> > --
> >
> -----------------------------------------------------------------------
> > Rolf Sander phone: [+49]
> 6131/305-4610
> > Max-Planck Institute of Chemistry email:
> > rolf.san...@mpic.de <mailto:rolf.san...@mpic.de>
> > PO Box 3060, 55020 Mainz, Germany homepage:
> > www.rolf-sander.net <http://www.rolf-sander.net>
> >
> -----------------------------------------------------------------------
> > https://www.encyclopedia-of-geosciences.net
> > https://www.geoscientific-model-development.net
> >
> -----------------------------------------------------------------------
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> >
> >
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> >
>
>
> --
> Tiago de Paula Peixoto <ti...@skewed.de>
>
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