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 <tiago@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.sander@mpic.de <mailto:rolf.sander@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
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