ghc-7.8-rc2 in -O2 mode eats all stack and RAM on pandoc-citeproc / highlighting-kate
Sergei Trofimovich
slyich at gmail.com
Thu Apr 3 20:20:17 UTC 2014
On Sat, 22 Mar 2014 22:21:42 +0300
Sergei Trofimovich <slyich at gmail.com> wrote:
> 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>
Nobody interested? Is it too scary?
Such inliner blowups are hard to shrink down from real
examples down to toy ones. I could try to but I need
a bit of guidance.
Maybe you need only an intermediate core step right
before an OOM, whatever?
Thanks!
--
Sergei
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