What was the worst bug you've ever solved ?
yummyfajitas: The nastiest was an interaction between two libraries. If you simultaneously imported xml.dom and matplotlib (both python libraries), and then called functions in one of the libraries (I think matplotlib), the program would segfault.My incomplete set of unit tests didn't catch it because they were imported by seperate submodules of mine.I only managed to find it by writing a unit test, going back in version control, searching for the first revision where the problem occurred, and going line by line through the changeset (luckily I commit early and often).