[Haskell-cafe] Identifying thunks from GHC heap profiles

[Tristan Ravitch]

I am trying to debug a stack overflow that seems to be caused by a
large chain of thunks being evaluated all at once.  I have some
profiles generated using +RTS -hd -RTS that show some promising
candidates, but they have generated names like

  Module.sat_s9et, Module.sat_s9jk, etc

Is there any convenient way to map these generated names back to
something recognizable in the source?  I tried using

 +RTS -hc -hdsat_s9et -RTS

to filter SCCs as suggested in
http://hackage.haskell.org/trac/ghc/ticket/1639, but the resulting
profile is always empty.  I also tried to use -fext-core and
-ddump-simpl to dump some intermediate representations but none of the
thunk names seem to appear in those outputs.
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