Re: libxml incompatibility

On 6 mar, 22:44, and(dot)(dot)(dot)(at)dunslane(dot)net (Andrew Dunstan) wrote:
> Holger Hoffstaette wrote:
> > On Fri, 06 Mar 2009 14:32:25 -0600, Kenneth Marshall wrote:
> >> On Fri, Mar 06, 2009 at 02:58:30PM -0500, Andrew Dunstan wrote:
> >>> Yes, I discovered this a few weeks ago. [...]
>
> Maybe someone can trace the libxml calls ... not sure how exactly ...
> given Alvaro's example, it doesn't seem likely to me that this is due to
> a call to xmlCleanupParser(), but maybe the perl code invokes by simply
> doing "use XML::LibXML;" calls that for some perverse reason.

I'm able to duplicate this on Postgres 8.4 (Debian Etch, XML::LibXML
from CPAN). Here's the backtrace from the crash:

#0 0x082f3cf1 in MemoryContextAlloc ()
#1 0x082c3f8a in xml_palloc ()
#2 0xb7dfa548 in xmlInitCharEncodingHandlers () from /usr/lib/
libxml2.so.2
#3 0xb7e0195e in xmlInitParser () from /usr/lib/libxml2.so.2
#4 0xb7dff2ef in xmlCheckVersion () from /usr/lib/libxml2.so.2
#5 0xb573af2e in boot_XML__LibXML ()
from /usr/local/lib/perl/5.8.8/auto/XML/LibXML/LibXML.so
#6 0xb587981b in Perl_pp_entersub () from /usr/lib/libperl.so.5.8
#7 0xb5877f19 in Perl_runops_standard () from /usr/lib/libperl.so.5.8
#8 0xb5819b6e in Perl_magicname () from /usr/lib/libperl.so.5.8
#9 0xb581a844 in Perl_call_sv () from /usr/lib/libperl.so.5.8
...

Is it supposed to be OK to call xmlCheckVersion() more than once?

--
DLL