Re: boost::python::def_visitor alignment / padding crash.

From: Janek Kozicki (janek.listy.mailowe_at_[hidden])
Date: 2019-12-20 23:30:43

I created an even smaller failing example, one without libeigen:

https://gitlab.com/cosurgi/minieigen-real/blob/minimalFailingFloat128/src/minimal-failing-float128.cpp

And the pipeline:

https://gitlab.com/cosurgi/minieigen-real/pipelines/104749255

Here you can clearly see that it crashes with def_visitor only.

best regards
Janek Kozicki

Janek Kozicki said:     (by the date of Sat, 21 Dec 2019 00:14:56 +0100)

> I have discovered an alignment related bug in boost::python::def_visitor
> 
> For a very detailed description see https://gitlab.com/libeigen/eigen/issues/1795
> 
> * a minimal failing example:
>   https://gitlab.com/cosurgi/minieigen-real/blob/minimalFailingExample/src/minimal-failing-float128.cpp
> 
> * and the failing CI pipeline:
>   https://gitlab.com/cosurgi/minieigen-real/pipelines/104745741
> 
> Initially I thought that it was related with libeigen. But it
> turns out that it crashes even without libeigen, when just using
> boost::multiprecision::float128.
> 
> The code crashes with g++ 8.3.0 and works with g++ 9.2.1
> boost version 1.67 is used there.
> 
> should I open an issue on boost github?
> 
> best regards
> -- 
> # Janek Kozicki                              http://janek.kozicki.pl/

-- 
# Janek Kozicki                              http://janek.kozicki.pl/