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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.

Trac metadata

Trac field	Value
Version	7.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Runtime System
Test case
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