Re: [xslt] Strange problem

[Nick Wellnhofer <wellnhofer aevum de>]

On 17/02/2014 14:52, Tobias Hoffmann wrote:
> Hi,
>
> with debian testing, esp. libxslt1.1_1.1.28-2_i386, using
>    xsltproc bug.xsl in.xml
> results in
> <root>a<s/><!-- c -->db<s/><!-- f -->e</root>
> instead of the expected original ordering.

Confirmed with Ubuntu 13.10, i386.

> Issuing
>    valgrind xsltproc bug.xsl in.xml
> makes the bug disappear:
> <root>a<s/>b<!-- c -->d<s/>e<!-- f --></root>
> Valgrind does not report any error, though.

Also confirmed.

> Analyzing the differences in these two build processes, I found that
>    ./configure LDFLAGS="-pie"
> is enough to trigger the problem. It's also sufficient to compile/link
> xsltproc with it.

Same here.

> I don't really know how to proceed from here. Maybe someone with more
> knowledge of libxslt has some idea, what the root cause could be? I suspect
> that -pie is just another trigger, just as valgrind suppresses the buggy
> behavior...

When I linked against the latest version of libxml2 from Git, the error 
disappeared (also with -pie). Seems that the commit "Fix XPath node comparison 
bug" fixed the issue:

https://git.gnome.org/browse/libxml2/commit/?id=fcd458318916809edc4fc4cd1ce2d5ba9aed4665

Nick