Hi all, I have a very simple program which reads a Data.Map from a file using Data.Binary and Data.ByteString.Lazy, which gives stack overflow with files over a certain size. Any ideas of what might be causing it? You can try it with the small file (11M) at: http://computing.dcu.ie/~gchrupala/map.bin import System import Data.Map import qualified Data.ByteString.Lazy as BS import Data.Binary main = do [path] <- getArgs m <- fmap decode (BS.readFile path)::IO (Map (Int,Maybe String) Int) putStrLn . show . findMax $ m -- Grzegorz -- View this message in context: http://www.nabble.com/Stack-overflow-tp15479718p15479718.html Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.