[Haskell-cafe] GHC Hangs

[Anatoly Yakovenko]

i've run ghc 6.6, and other open source software, on a core duo
thinkpad without any problems.  building bisect.hs works fine as well.
 I am using the winxp professional sp 2.

On 5/7/07, Josiah Manson <josiahmanson at gmail.com> wrote:
> 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
>
>
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