crashes (same happens with graphviz 2.27.20100201.0545) Similar files work ok. Neato can process the file.
Input file: b1909.dot
Comments:
[erg] It's a fairly large graph for dot. Here is the trace log.

[erg] The stack is being blown in the recursive use of treesearch() in ns.c. The graph in that phase has 752011 nodes and 1128201 edges.
Owner: *
Status: *