Greetings Gentlemen (and Ladies), As part of my small and simple framework for making presentations in Haskell I have a module which, given some text, makes a .tex file and then converts it to .svg for loading into a cairo canvas. It features simple caching (performs md5 on the contents of the .tex file and uses that as the file name... if an .svg by that name exists, it'll get loaded rather than regenerated). Unfortunately, it also segfaults once in a while, probably indicating I have some kind of race condition ... but I can't figure out why. This is the only point in my code that I think I'm using any concurrency, although I'm compiling with ghc --make -threaded. Compiling without -threaded results in a deadlock. Ubuntu 8.10, 64-bit, GHC 6.8.2. Any advice? I'm attaching the module in question (79 lines). Sincerely, Rafal Kolanski.