crash dot multiple

Graphviz (dot) crashes when inputting multiple diagrams from STDIN

Hello, I would like to report a bug in dot and perhaps offer assistance. I am testing this on the latest March 16th development snapshot, but the stable version did not work as well. Unfortunately I am not familiar enough with the codebase to know what is going on .. but from I was able to rule out is the cleanup procedures in dot.c - commenting them out does not fix the crash. Also I had a real world example with HTML labels .. they caused a lot of problems in a second input as well. Would be cool to fix it as it would allow running dot as a worker for an FastCGI application for example.

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