GHC internal error

[Don Stewart]

Any 'internal error' is almost certainly an RTS or compiler bug. Can you
make a bug report?


philip.weaver:
> Hi all,
> 
> A program that I built with GHC is crashing at runtime with the following
> error:
> 
>     internal error: eval_thunk_selector: strange selectee 12
> 
> I have not found much via Google, just an old post regarding ghc 6.0 that
> recommends cleaning and rebuilding.  I have cleaned the build directory and
> re-built the executable, and I still get the error.
> 
> The program is a compiler, and this error began showing up after I added
> support for memoization of results using the ST Monad and STRefs.  For example,
> the following function creates a reference to a thunk:
> 
> newMutableRef m
>   = do ref <- newSTRef $ error "access ref too soon!"
>        let m' = do r <- m
>                    writeSTRef ref (return r)
>                    return r
>        writeSTRef ref m'
>        return $ ref
> 
> Here's some information about my system:
> 
>   • GHC 6.12.1
>   • Mac OS X 10.6.3 (Snow Leopard)
> 
> So, what could cause this error?  Any suggestions that can help me narrow down
> the problem would be greatly appreciated.  If this is in fact a GHC bug, I'd
> like to find a workaround for now and also reproduce it in a small example so I
> can file a bug report.
> 
> - Philip
> 

> _______________________________________________
> Glasgow-haskell-users mailing list
> Glasgow-haskell-users at haskell.org
> http://www.haskell.org/mailman/listinfo/glasgow-haskell-users