id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
4506	"program fails with ""Segmentation fault/access violation in generated code"""	HolgerReinhardt	igloo	"I have the following program:

{{{
module Main where

import Control.Concurrent.Chan
import Control.Concurrent
import Control.Monad

main = forever $ do
    c <- newChan
    mapM_ (\ix -> writeChan c ""test"") [1..500000]
    mapM_ (\ix -> writeChan c ""test"") [1..500000]

    c <- newChan
    forkIO $ mapM_ (\ix -> writeChan c ""test"") [1..500000]
    mapM_ (\ix -> readChan c) [1..500000]
}}}

Compiling and running I get this behaviour:

{{{
I:\haskell>ghc -O error.hs
[1 of 1] Compiling Main             ( error.hs, error.o )
Linking error.exe ...

I:\haskell>error
Segmentation fault/access violation in generated code
}}}

If the program doesn't crash after about 30seconds you may have to cancel and restart it, as it sometimes seems to run forever without crashing.

I have tested the binary on another Windows machine and got the same crash, so a hardware problem seems unlikely."	bug	closed	highest	7.0.2	Runtime System	7.0.1	fixed			Windows	x86	Runtime crash