GHC internal error
dons at galois.com
Mon Apr 5 14:59:12 EDT 2010
Any 'internal error' is almost certainly an RTS or compiler bug. Can you
make a bug report?
> Hi all,
> A program that I built with GHC is crashing at runtime with the following
> 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
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