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Re^3: Segmentation fault from XML::Twig::Elt

by mirod (Canon)
on Nov 07, 2011 at 10:33 UTC ( #936468=note: print w/replies, xml ) Need Help??


in reply to Re^2: Segmentation fault from XML::Twig::Elt
in thread Segmentation fault from XML::Twig::Elt

I can reproduce the problem in win32 (perl 5.12.3), but not on linux (perl5.12.3, 5.12.4 or 5.14.2). So since it's the same code on all 3 versions, I would think it's a bug somewhere in Scalar::Util::weaken or in the core, but only on windows. Which is a bit annoying since I don't develop on windows, I only use it to test modules before a release.

I am not sure where to go from there honestly. Any idea?

  • Comment on Re^3: Segmentation fault from XML::Twig::Elt

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Re^4: Segmentation fault from XML::Twig::Elt
by isync (Hermit) on Nov 07, 2011 at 14:07 UTC
    Most in this thread already is beyond my knowledge of the internal workings,
    but I can contribute that I got this error on a:
    Debian 4.0 box with Perl v5.10.0 built for i486-linux-gnu-thread-multi with these module versions: and on
    Ubuntu 11.04 with Perl v5.10.1 (*) built for i686-linux-gnu-thread-multi.
Re^4: Segmentation fault from XML::Twig::Elt
by Anonymous Monk on Nov 08, 2011 at 04:46 UTC

      The bug is in Perl itself, and seems to be fixed in 5.15.5.

      The following code, which is the simplest I have found to trigger the problem, causes a segmentation fault for versions up to 5.14.2, but not in 5.15.5 or bleadperl:

      #!/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, blead # at these values, 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";

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[perldigious]: A question since I'm ignorant of what's normal for database management... Do admins change column names a lot in databases?
[perldigious]: On occasion my scripts break, because they will do something that seems laregly pointless to me... like in this case, changing a column name from "ABC Category" to "ABC Category Override".
[perldigious]: Being the ignorant one, my initial reaction to that is, "that's sort of a dick move, a lot of people like me expect column names like that to stay the same, why the hell would you change them like that for seemingly no good reason?"
[perldigious]: Or is my irritation/ frustration well founded?
[Corion]: perldigious: That seems to be more the export and likely it's the recipients of that export that like the titles changes
[Corion]: ... "changed"
[Corion]: I usually expect fixed header names, but am sometimes lenient in the order of columns. But changing the report titles often sounds to me as if you are not the sole consument of the export ;)

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