Good job everybody, but you did not go far enough ;--) It's not a bug in XML::Parser, I believe it's a bug in Perl: if you use weaken a few thousand times it will segfault.
The code below shows the bug:
#!/usr/bin/perl
use strict;
use warnings;
use Scalar::Util 'weaken';
# the number of iteration that causes a segmentation fault varies
# on my machine, 5.14.2 18700, 5.12.4 20147, At this thresholds
# the bug shows up most of the time but not always
+
+
+
my $ITER= $ARGV[0] || 18700;
+
+
+
+
my $head= {};
+
+
my $tail= $head;
+
+
+
+
foreach (1..$ITER)
{ my $new_tail= { p => $tail };
weaken( $new_tail->{p});
$tail->{n}= $new_tail;
$tail= $new_tail;
}
print "done\n";
The good news is that the bug is fixed in blead and in recent 5.15.*. I don't know which version exactly, but I know it's fixed in 5.15.7. and in 5.15.8.
So, if possible, you should use perlbrew, install 5.15.8 and get the development version of XML::Twig from xmltwig.org since XML::Twig 3.39 produces warnings in 5.15.8. Once you've re-installed all of the modules you use, your script should then work properly. BTW the development version of XML::Twig passes all the tests, so it is safe to use.
Let me know if you have any more problem.
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