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

It's definitely hashable. Here's a minimal failing test case: https://gist.github.com/gregorycollins/5748445 On Sat, May 18, 2013 at 11:38 PM, Roman Cheplyaka wrote:

Indeed it looks like a bug in hashable — it goes away with hashable-1.1.2.5.

Building with -f-sse2 results in a linker error

Loading package hashable-1.2.0.7 ... linking ... ghc: /home/feuerbach/tmp/aeson/.cabal-sandbox/lib/i386-linux-ghc-7.6.3/hashable-1.2.0.7/libHShashable-1.2.0.7.a: unknown symbol `hashable_siphash24_sse2' ghc: unable to load package `hashable-1.2.0.7'

Roman

* Gregory Collins [2013-05-18 22:19:38+0200]

...

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 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

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