[graphviz-interest] pseudo-random segfault when using raster image renderers

http://www.graphviz.org/mantisbt/view.php?id=2407

I think I'm encountering the same bug as this, except for me it's not
consistent. I've got a wide range of dot files, some with a single
small graph, some with many graphs small and large. Sometimes they all
render just fine, and sometimes there's a segmentation fault, but
every time it happens in a different place in the rendering process.
Making the graphs smaller reduces the frequency of the crashing.

What can I do to help track this problem down?
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