[Haskell-cafe] Non-deterministic behaviour of aeson's parser

[Clark Gaebel]

$ uname -a
Linux clark-laptop 3.9.0-2-ARCH #1 SMP PREEMPT Tue Apr 30 09:48:29 CEST
2013 x86_64 GNU/Linux

It'd take too long for my helpfulness to build with cabal install -fsse2
hashable and rebuild an environment.

If someone writes a bash script to do it (using cabal-dev please!), I'd be
more than happy to run it and post the results.

  - Clark

On Saturday, May 18, 2013, Gregory Collins wrote:

> First off, everyone reporting results to this thread: your bug report
> would be much more helpful if you included your OS/architecture/GHC version
> combo, as well as the results of re-running the tests if you build
> "hashable" with "cabal install -f-sse2".
>
> I have a funny feeling that this is a bug in hashable or
> unordered-containers. I'm guessing hashable, especially because of this:
>
>     https://github.com/tibbe/hashable/issues/66
>
> and because hashable has had subtle bugs in its C code before (see
> https://github.com/tibbe/hashable/issues/60).
>
> G
>
> On Sat, May 18, 2013 at 6:25 PM, Roman Cheplyaka <roma at ro-che.info<javascript:_e({}, 'cvml', 'roma at ro-che.info');>
> > wrote:
>
>> I am observing a non-deterministic behaviour of aeson's parser.
>>
>> I'm writing here in addition to filing a bug report [1] to draw
>> attention to this (pretty scary) problem.
>>
>> To try to reproduce this problem, do this:
>>
>>   git clone https://gist.github.com/5604887.git aeson
>>   cd aeson
>>   ghc aeson.hs
>>   ./aeson | sort | uniq -c
>>
>> This is my result:
>>
>>     32 Left "key \"module\" not present"
>>     55 Left "When parsing the record SymValue of type Main.SymValueInfo
>> the key fixity was not present."
>>   1913 Right ()
>>
>> Can others reproduce this in their environments?
>>
>> Does anyone have ideas about where the bug may lie?
>> Many aeson's dependencies do unsafe IO stuff that could lead to
>> such consequences.
>>
>> Roman
>>
>> [1]: https://github.com/bos/aeson/issues/125
>>
>> _______________________________________________
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>>
>
>
>
> --
> Gregory Collins <greg at gregorycollins.net <javascript:_e({}, 'cvml',
> 'greg at gregorycollins.net');>>
>
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