I've isolated the below small piece of code that is giving me a stack overflow. I'm kind of at a loss as has to fix, or even find what is happening here. (The real program is reading the data from a file, and doing something more complex with it). I'm not even sure how to work around this issue. It fails for me when given an argument of 1000000. Any ideas? I'm running 7.0.4, but I've tried this with ghc 6.12.3, and 7.4.1. Thanks, David ---------------------------------------------------------------------- import Control.Applicative import Control.Monad import Data.Binary import Data.Binary.Put import Data.Binary.Get import Data.List import Data.Word import System.Environment putValues :: [Int] -> Put putValues vals = mapM_ (putWord32le . fromIntegral) vals getValues :: Int -> Get [Int] getValues count = replicateM count (fromIntegral <$> getWord32le) goofySum :: Int -> Int goofySum count = let block = runPut $ putValues [1 .. count] in foldl' max 0 $ runGet (getValues count) block main :: IO () main = do args <- getArgs let count = case args of [c] -> read c _ -> error "Invalid usage" putStrLn $ show $ goofySum count ----------------------------------------------------------------------