Bug#816280: Binary incompatibility between debugperl and perl

[Niko Tyni]

On Mon, Feb 29, 2016 at 12:17:39PM +0000, Dominic Hargreaves wrote:
> Control: forwarded -1 https://rt.perl.org/Public/Bug/Display.html?id=127212
> Control: tags -1 + fixed-upstream confirmed
> 
> On Mon, Feb 29, 2016 at 12:53:33PM +0100, Nick Wellnhofer wrote:
> > Package: perl-debug
> > Version: 5.20.2-2
> > 
> > The layout of interpreter variables is different in the debug and normal
> > version of the perl binary. This means that XS extensions might read from or
> > write to the wrong area of the interpreter variable struct, causing crashes
> > and other strange behavior.
> > 
> > Here's an example, originally reported by me at
> > https://rt.cpan.org/Public/Bug/Display.html?id=111211
> > 
> >     $ PERL_DESTRUCT_LEVEL=2 debugperl -MList::Util=shuffle -e shuffle
> >     Segmentation fault

> This was discovered as part of the investigation into 
> <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=810326> (which is
> not quite the same bug) and was fixed upstream. This fix should be in
> 5.24 which should be in stretch. However, the fix by its nature breaks
> binary compatibility, so it will unfortunately not be possible to apply
> it to a stable release.

The workaround in sid/stretch disabling PERL_TRACK_MEMPOOL for the debug
build (debian/debugperl-compat-fix.diff) should be applicable to jessie
too. We should probably push it into a stable update.
-- 
Niko Tyni   ntyni at debian.org