| Subject: | free(): invalid pointer |
We are using XML::LibXML as the XML parser in the mailing list server we are developing, Sympa (http://www.sympa.org).
With recent versions of libxml2 (2.6.16 ; Fedora core 3) we are having fatal error while parsing an XML file and splitting it into N xml files, one for each node. Attached is a simplified perl script that demonstrates the problem. Before you run it, change the path to an existing XML file. You should get the following error :
$ perl /usr/local/sympa/src/tools/testxml.pl
*** glibc detected *** free(): invalid pointer: 0x080660d3 ***
Abort (core dumped)
Now try uncommenting the parse_file() line and comment the parse_fh() line.
That's a really strange behavior that seems somehow related to the use of the setDocumentElement() method.
#!/usr/bin/perl
## Simple script to demonstate the "free(): invalid pointer" bug
use XML::LibXML;
my $parser = XML::LibXML->new();
my $xml_fh;
open $xml_fh, '/tmp/anydata.xml' || die;
my $doc;
## keep one of these lines commented
#$doc = $parser->parse_file('/tmp/anydata.xml');
$doc = $parser->parse_fh($xml_fh);
my $root = $doc->documentElement();
my @nodes = $root->childNodes();
foreach my $list_elt (@nodes) {
my $list_doc = XML::LibXML::Document->createDocument($doc->version(),$doc->encoding());
$list_doc->setDocumentElement($list_elt);
$list_doc->toFile('/tmp/last_elt.xml');
}