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Id: 24548
Status: open
Priority: 0/
Queue: XML-Twig
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Owner: Nobody in particular
Requestors: emile [...] caida.org
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  Wed Jan 24 18:51:30 2007 emile [...] caida.org - Ticket created
Subject: bus error / coredump with XML::Twig 3.29
Date: Wed, 24 Jan 2007 15:51:04 -0800
To: bug-XML-Twig [...] rt.cpan.org
From: Emile Aben <emile [...] caida.org>
I seem to have a problem with perl core dumping when using XML::Twig. The shortest version I could come up with that demonstrates the problem is: perl -MXML::Twig -e'open(F,"<","./bus_error.xml"); my $t=XML::Twig->new() ; $t->parse(*F)' where I get the error: Bus error (core dumped) And a core dump is created (perl.core). The bus_error.xml this occurs on is at: http://www.caida.org/~emile/bus_error.xml I've tried this with an older version (3.22) on the same system, and it looks like that has the same problem. I've also tried this on another freebsd system, with the same symptoms. some more info: Configuration: perl: 5.008007 OS: freebsd - i386-freebsd XML::Parser : 2.34 (required) expat : 1.95.8 (required) Scalar::Util : 1.18 (for improved memory management) Encode : 2.10 (for encoding conversions) LWP : 5.803 (for the parseurl method) HTML::Entities : 1.32 (for the html_encode filter) Tie::IxHash : 1.21 (for the keep_atts_order option) XML::XPathEngine : <not available> (to use XML::Twig::XPath) XML::XPath : 1.13 (to use XML::Twig::XPath if Tree::XPathEngine not available) HTML::TreeBuilder : 3.13 (to use parse_html and parsefile_html) Text::Wrap : 2001.09293 (to use the "wrapped" option for pretty_print) Test : 1.25 (for testing purposes) Test::Pod : <not available> (for testing purposes) XML::Simple : 2.14 (for testing purposes) XML::Handler::YAWriter : 0.23 (for testing purposes) XML::SAX::Writer : 0.44 (for testing purposes) XML::Filter::BufferText : 1.01 (for testing purposes) IO::Scalar : 2.110 (for testing purposes) I've not encountered perl core dumps on this system before (and used perl quite a lot on it) I've worked around the problems with this file by splitting it up in smaller pieces and processing it that way, but I thought it might be good to let the maintainer know of this potential problem. hth, Emile
  Thu Jan 25 11:17:56 2007 mirod [...] xmltwig.com - Correspondence added
Subject: Re: [rt.cpan.org #24548] bus error / coredump with XML::Twig 3.29
Date: Thu, 25 Jan 2007 17:22:45 +0100
To: bug-XML-Twig [...] rt.cpan.org
From: mirod <mirod [...] xmltwig.com>
Emile Aben via RT wrote: Show quoted text
> I seem to have a problem with perl core dumping when using XML::Twig. > The shortest version I could come up with that demonstrates the problem is: > > perl -MXML::Twig -e'open(F,"<","./bus_error.xml"); my $t=XML::Twig->new() ; $t->parse(*F)' > > where I get the error: > Bus error (core dumped) > > And a core dump is created (perl.core). > > The bus_error.xml this occurs on is at: > http://www.caida.org/~emile/bus_error.xml > > I've tried this with an older version (3.22) on the same system, and it looks like > that has the same problem. I've also tried this on another freebsd system, with the > same symptoms. > > I've not encountered perl core dumps on this system before (and used perl quite a lot on it) > > I've worked around the problems with this file by splitting it up in smaller pieces and > processing it that way, but I thought it might be good to let the maintainer know of > this potential problem.
Hi, This is weird. Of course I cannot reproduce the bug on my machine (linux). Could you replace XML::Twig by XML::Parser and see if you get the same problem? If not we'll know that the problem is with XML::Twig, otherwise it comes from XML::Parser. Thanks -- mirod
  Thu Jan 25 11:18:00 2007 The RT System itself - Status changed from 'new' to 'open'
  Thu Jan 25 12:37:36 2007 emile [...] caida.org - Correspondence added
CC: emile [...] caida.org
Subject: Re: [rt.cpan.org #24548] bus error / coredump with XML::Twig 3.29
Date: Thu, 25 Jan 2007 09:32:55 -0800
To: "mirod [...] xmltwig.com via RT" <bug-XML-Twig [...] rt.cpan.org>
From: Emile Aben <emile [...] caida.org>
On Thu, Jan 25, 2007 at 11:18:02AM -0500, mirod@xmltwig.com via RT wrote: Show quoted text
> > <URL: http://rt.cpan.org/Ticket/Display.html?id=24548 > > > Emile Aben via RT wrote: >
> > I seem to have a problem with perl core dumping when using XML::Twig. > > The shortest version I could come up with that demonstrates the problem is: > > > > perl -MXML::Twig -e'open(F,"<","./bus_error.xml"); my $t=XML::Twig->new() ; $t->parse(*F)' > > > > where I get the error: > > Bus error (core dumped) > > > > And a core dump is created (perl.core). > > > > The bus_error.xml this occurs on is at: > > http://www.caida.org/~emile/bus_error.xml > > > > I've tried this with an older version (3.22) on the same system, and it looks like > > that has the same problem. I've also tried this on another freebsd system, with the > > same symptoms. > > > > I've not encountered perl core dumps on this system before (and used perl quite a lot on it) > > > > I've worked around the problems with this file by splitting it up in smaller pieces and > > processing it that way, but I thought it might be good to let the maintainer know of > > this potential problem.
> > Hi, > > This is weird. Of course I cannot reproduce the bug on my machine (linux). > > Could you replace XML::Twig by XML::Parser and see if you get the same > problem? If not we'll know that the problem is with XML::Twig, otherwise > it comes from XML::Parser.
perl -MXML::Parser -e'open(F,"<","./bus_error.xml"); my $t=XML::Parser->new() ; $t->parse(*F)' doesn't result in a core dump/bus error message. A gdb backtrace shows this: (gdb) bt #0 0x280e49cb in Perl_hv_fetch_ent () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #1 0x280f1c7b in S_method_common () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #2 0x280f1971 in Perl_pp_method_named () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #3 0x280e98fd in Perl_runops_standard () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #4 0x2809886f in S_call_body () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #5 0x280985e5 in Perl_call_sv () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #6 0x280f9042 in Perl_sv_clear () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #7 0x280f96a9 in Perl_sv_free () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #8 0x280f93c1 in Perl_sv_clear () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #9 0x280f96a9 in Perl_sv_free () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #10 0x280e6055 in Perl_hv_free_ent () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #11 0x280e645c in S_hfreeentries () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #12 0x280e64be in Perl_hv_undef () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #13 0x280f92d2 in Perl_sv_clear () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #14 0x280f96a9 in Perl_sv_free () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #15 0x280f93c1 in Perl_sv_clear () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #16 0x280f96a9 in Perl_sv_free () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #17 0x280e6055 in Perl_hv_free_ent () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #18 0x280e645c in S_hfreeentries () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #19 0x280e64be in Perl_hv_undef () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #20 0x280f92d2 in Perl_sv_clear () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #21 0x280f96a9 in Perl_sv_free () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #22 0x280f93c1 in Perl_sv_clear () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #23 0x280f96a9 in Perl_sv_free () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #24 0x280e6055 in Perl_hv_free_ent () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so ... (seems the same 7 lines loop here) #19807 0x280e645c in S_hfreeentries () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #19808 0x280e64be in Perl_hv_undef () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #19809 0x280f92d2 in Perl_sv_clear () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #19810 0x280f96a9 in Perl_sv_free () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #19811 0x280fd150 in Perl_sv_unref_flags () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #19812 0x280f7d5e in Perl_sv_force_normal_flags () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #19813 0x28111aa3 in Perl_leave_scope () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #19814 0x2810f9e4 in Perl_pop_scope () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #19815 0x280ee704 in Perl_pp_leave () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #19816 0x280e98fd in Perl_runops_standard () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #19817 0x28097eb6 in S_run_body () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #19818 0x28097b41 in perl_run () from /usr/local/lib/perl5/5.8.7/mach/CORE/libperl.so #19819 0x0804905c in main () A 'ktrace/kdump' (strace for freebsd) shows: # ktrace perl -MXML::Twig -e'open(F,"<","./bus_error.xml"); my $t=XML::Twig->new() ; $t->parse(*F)' # kdump ... 12106 perl RET break 0 12106 perl CALL break(0x88d8000) 12106 perl RET break 0 12106 perl CALL break(0x88d8800) 12106 perl RET break 0 12106 perl CALL break(0x88d9800) 12106 perl RET break 0 12106 perl PSIG SIGBUS SIG_DFL 12106 perl NAMI "perl.core" If there is anything else I can to help debug the problem please let me know. Emile PS: hmmm I just realized that this debugging output was all generated with XML::Twig 3.23, I could generate 3.29 output if it's useful.