internal error retainstack profiler
internal error: Invalid object found in retainStack(): 49139
(GHC version 6.7.20070824 for i386_unknown_linux)
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
With options:
./Main +RTS -p -hr -K900M -L35 -xc -RTS