Hello Haskellers, I have a problem where GHC will hang after compiling a file. The problem seems to occur with my computer, but not with everyone else's. I hope that someone my be able to diagnose my problem. My computer is an Acer Aspire 5670, which runs on an Intel Core Duo T2300 and runs Windows XP Home Edition. My version of GHC is The Glorious Glasgow Haskell Compilation System, version 6.6. When supplied the file bisect.hs with the following contents: sign a | a < 0 = -1 sign a | a >= 0 = 1 bisect f a b = if b - a < eps then c else if sign (f a) == sign (f c) then bisect f c b else bisect f a c where c = (a + b) / 2 eps = 0.000000000000001 main = print $ bisect cos 0 2 Running produces this output at which point nothing further happens. The same thing happens without -dcore-lint -debug, but I have included it because someone suggested it would provide useful diagnostics. C:\data\code\other\haskell\simple>ghc --make bisect.hs -dcore-lint -debug [1 of 1] Compiling Main ( bisect.hs, bisect.o ) The file bisect.o is generated, but GHC is stopped and not using any CPU time. As well, there are two other processes that were spawned and must also be killed separately named gcc.exe and as.exe. Interestingly, if I do multiple iterations of running ghc then killing it. I eventually get a working executable. As far as I can tell, GHC is deadlocked, which makes me wonder if dual cores are causing the problem. BTW, problems like this have occurred in other free software like Open Office, but leaves most other programs unaffected. Josiah