ghc-7.8-rc2 in -O2 mode eats all stack and RAM on pandoc-citeproc / highlighting-kate

[Sergei Trofimovich]

Hello!

I have noticed the problem in ghc-7.6.3 first
when tried to build all haskell userland with -O2 opt level.

It led to amazing bugs!

Here is one of those (highlighting-kate hackage package):
> [281 of 452] Compiling Text.Highlighting.Kate.Syntax.Asp ( highlighting-kate-0.5.6.1/Text/Highlighting/Kate/Syntax/Asp.hs, highlighting-kate-0.5.6.1/Text/Highlighting/Kate/Syntax/Asp.o )
> stack overflow: use +RTS -K<size> to increase it

How to reproduce it:
1. Download a bundled file (6.6MB):
    http://code.haskell.org/~slyfox/selfcontained-eater-ghc-7.8-rc2.tar.gz
2. Unpack and run there:
  ./mk.sh

The script is designed to plug any built ghc version w/o external depends.

Command will fail as:
    $ ./mk.sh
    ...
    [281 of 452] Compiling Text.Highlighting.Kate.Syntax.Asp ( highlighting-kate-0.5.6.1/Text/Highlighting/Kate/Syntax/Asp.hs, highlighting-kate-0.5.6.1/Text/Highlighting/Kate/Syntax/Asp.o )
    stack overflow: use +RTS -K<size> to increase it

On ghc-7.6.3 it will progress a bit more: down to 452 file and will crash there
similar way.

I've 'cabal unpack'-ed all sources and configured/de-.hsc-ed them
manually/added needed -DWhatever / added {-# LANGUAGE CPP #-}
around. Nothing else.

It's very hard to shrink such large thing manually down to 2-3 files.
Would be cool if ghc (and cabal) would be able to spit something
self-sufficient (like 'gcc -i' does) for devs to reproduce.

Adding '-v' shows such log:
    ...
    *** Simplifier:
    Result size of Simplifier iteration=1
      = {terms: 21,973, types: 21,838, coercions: 1,842}
    Result size of Simplifier iteration=2
      = {terms: 21,952, types: 21,819, coercions: 1,842}
    Result size of Simplifier
      = {terms: 21,950, types: 21,817, coercions: 1,842}
    *** SpecConstr:
    Result size of SpecConstr***<CRASH>

Thanks!

-- 

  Sergei
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