Re: [xml] correct version of libxml2

[Marco Rogers <marco rogers gmail com>]

Daniel:

Can you shed a little more light on why this call isn't always needed? In what situations is it necessary to 
call it?

Sent from my iPhone

On Apr 25, 2011, at 8:02 AM, "Floodeenjr, Thomas" <thomas_floodeenjr mentor com> wrote:

> Daniel,
>
> Yes indeed, we seem to be calling xmlCleanupParser() in many places. We will get with our engineering teams 
> to investigate removing this call from our code. I would imagine that they thought at the time that this 
> call was needed, as it appears to have had no ill side effects in the 2.6.x versions of libxml2.
>
> Thanks,
> -Tom
>
>
> Thomas Floodeen, Jr.
> Mentor Graphics BSD
> 720.494.1133
>
>
> -----Original Message-----
> From: Daniel Veillard [mailto:veillard redhat com] 
> Sent: Monday, April 25, 2011 7:48 AM
> To: Floodeenjr, Thomas
> Cc: xml gnome org
> Subject: Re: correct version of libxml2
>
>  Hi Thomas,
>
> thanks for getting back to me on this issue, and in the proper forum !
>
> On Mon, Apr 25, 2011 at 01:30:30PM +0000, Floodeenjr, Thomas wrote:
> > Daniel,
> >
> > I believe you are correct. I found out that our code works with libxml2-2.7.2, but started to crash in 
> > 2.7.3. I traced it down to a small change in threads.c:921 in 2.7.3:
> >
> > #elif defined HAVE_PTHREAD_H
> >    if ((libxml_is_threaded)  && (pthread_key_delete != NULL))
> >        pthread_key_delete(globalkey); #endif
> >
> > If I comment out the pthread_key_delete() call, our crash goes away. For expediency, I am doing this now. 
> > However, we would like to track down why we are crashing.
>
>  How did you end up calling xmlCleanupThreads() where that code is done.
> It sounds very likely that you are calling xmlCleanupParser() while still using the library, and well in 
> that case the crash is normal !
>  http://xmlsoft.org/html/libxml-parser.html#xmlCleanupParser
>
> see the documentation, you should call this function only once libxml2 is not in use anywhere in the 
> application, which those days is very had to assert. Simplest is to just not call it.
>
> Daniel
>
> > -----Original Message-----
> > From: Daniel Veillard [mailto:veillard redhat com]
> > Sent: Sunday, April 24, 2011 8:17 PM
> > To: Floodeenjr, Thomas
> > Cc: Aleksey Sanin; xmlsec aleksey com
> > Subject: Re: [xmlsec] correct version of libxml2
> >
> > On Wed, Apr 20, 2011 at 04:40:37PM +0000, Floodeenjr, Thomas wrote:
> > > Aleksey,
> > >
> > > We are having problems with libxml2 that are not related to xmlsec.
> > > Our xmlsec tests are working fine so far, but some of our core 
> > > libxml2 usage is broken.
> >
> >  That's the wrong place to report such problems.
> > 2.6.x releases are rather old and 2.6.12 is very old. I fixed a number of things in libxml2 since then. If 
> > you got troubles, it may be due to a misuse of the library, compilation problems, or possibly a bug but 
> > it's impossible to tell from your report, and this list ain't the right place for it:
> >  http://xmlsoft.org/bugs.html
> >
> >  In my experience as libxml2 maintainer most of the time when people 
> > report "bugs" appareing in recent libxml2 versions it is that they 
> > relied upon broken behaviour usually not conformant to the 
> > specification. Hiding the problem around by keeping an obsolete 
> > version of the library rather than investigating the problem exposes 
> > the user to risk including security ones. If you are embbeding libxml2 
> > for any shipping product I urge you to actually report the problem and 
> > get it solved instead of hiding this under the carpet by using an 
> > obsolete
> > libxml2 version,
> >
> >  thanks in advance,
> >
> > Daniel
> >
> > -- 
> > Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
> > daniel veillard com  | Rpmfind RPM search engine http://rpmfind.net/ 
> > http://veillard.com/ | virtualization library  http://libvirt.org/
>
> -- 
> Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
> daniel veillard com  | Rpmfind RPM search engine http://rpmfind.net/ http://veillard.com/ | virtualization 
> library  http://libvirt.org/
> _______________________________________________
> xml mailing list, project page  http://xmlsoft.org/
> xml gnome org
> http://mail.gnome.org/mailman/listinfo/xml