Re: Segfault in XML::LibXML

Petr Pajas wrote:
> I wonder why Fedora whould ship XML::LibXML 1.66. Install something newer from 
> CPAN (latest is XML-LibXML-1.69_2). You'll also have to upgrade  XML::LibXSLT.

I dunno... It's in the development directory, but I guess that's
slated for Fedora 11, rather than an update for F10.
Don't even ask what version is available on enterprise/centos... :<

> Also, is it really libxml2-2.6.3.1? or did you misspell the version and it is 
> actually libxml2-2.6.31? 

No, sorry: typo, it's 2.7.3-1
> 
> Please verify that the bug goes away with the latest version and if so, 
> request at Fedora (e.g. using their bugzilla) that they upgrade to the up-
> stream version of XML::LibXML.

Sorry for the delay; I've gotten lazy having my
packages managed for me, so it took a moment
to set up to test a non-packaged package....

Anyway: Good call! 1.69 indeed fixes the problem.
Valgrind is happy, and my system runs all the
way through w/o problems!

Thanks!

[I'll try to rattle fedora's cage]

> -- Petr
> 
> Dne pátek 27 Únor 2009 18:35:08 Bruce Miller napsal(a):
>> Hi all;
>>    I've just started getting one of those lovely errors
>> we all enjoy so much. You know the ones: they sometimes
>> give segfaults, but not every time, and only happens
>> on long jobs...
>>
>> So, I ran valgrind (with PERL_DESTRUCT_LEVEL=2),
>> which then takes _even_ longer, and end up with
>> some kind of reference counting error, I presume?
>> (see below).
>> This is on fedora 10,
>> perl-5.10.0-56
>> libxml2-2.6.3.1
>> perl-XML-LibXML-1.66-2
>>
>> Undoubtedly, this isn't enough to proceed with,
>> but as this is relatively unfamiliar territory
>> for me: Does anyone have suggestions how to
>> localize the problem better?
>>
>>> ==4053== Invalid read of size 8
>>> ==4053==    at 0xAF9F838: PmmREFCNT_dec (in
>>> /usr/lib64/perl5/vendor_perl/5.10.0/x86_64-linux-thread-multi/auto/XML/Li
>>> bXML/LibXML.so) ==4053==    by 0xAF32D1A: XS_XML__LibXML__Node_DESTROY (in
>>> /usr/lib64/perl5/vendor_perl/5.10.0/x86_64-linux-thread-multi/auto/XML/Li
>>> bXML/LibXML.so) ==4053==    by 0x38EA4BF6B4: Perl_pp_entersub (in
>>> /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
>>> ==4053==    by 0x38EA4BA90B: Perl_call_sv (in
>>> /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
>>> ==4053==    by 0x38EA4D63DC: Perl_sv_clear (in
>>> /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
>>> ==4053==    by 0x38EA4D6D40: Perl_sv_free2 (in
>>> /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
>>> ==4053==    by 0x38EA4D66F0: Perl_sv_clear (in
>>> /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
>>> ==4053==    by 0x38EA4D6D40: Perl_sv_free2 (in
>>> /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
>>> ==4053==    by 0x38EA4ADAF0: Perl_hv_free_ent (in
>>> /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
>>> ==4053==    by 0x38EA4AF020: (within
>>> /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
>>> ==4053==    by 0x38EA4B1020: Perl_hv_undef (in
>>> /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
>>> ==4053==    by 0x38EA4D6805: Perl_sv_clear (in
>>> /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
>>> ==4053==  Address 0x2711ff30 is 0 bytes inside a block of size 34 free'd
>>> ==4053==    at 0x4A0609F: free (vg_replace_malloc.c:323)
>>> ==4053==    by 0x38EA4B05C1: Perl_hv_common (in
>>> /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
>>> ==4053==    by 0x38EA4C3B09: Perl_pp_helem (in
>>> /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
>>> ==4053==    by 0x38EA494AC6: Perl_runops_debug (in
>>> /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
>>> ==4053==    by 0x38EA4BB5D6: perl_run (in
>>> /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
>>> ==4053==    by 0x400CF3: main (in /usr/bin/perl)
>>>
>>> ==4053==
>>> ==4053== ERROR SUMMARY: 2 errors from 1 contexts (suppressed: 4 from 1)
>>> ==4053== malloc/free: in use at exit: 56,246 bytes in 521 blocks.
>>> ==4053== malloc/free: 323,176,837 allocs, 323,176,316 frees,
>>> 21,619,182,773 bytes allocated. ==4053== For counts of detected errors,
>>> rerun with: -v
>>> ==4053== searching for pointers to 521 not-freed blocks.
>>> ==4053== checked 803,936 bytes.
>>> ==4053==
>>> ==4053== LEAK SUMMARY:
>>> ==4053==    definitely lost: 0 bytes in 0 blocks.
>>> ==4053==      possibly lost: 0 bytes in 0 blocks.
>>> ==4053==    still reachable: 56,246 bytes in 521 blocks.
>>> ==4053==         suppressed: 0 bytes in 0 blocks.
>>> ==4053== Rerun with --leak-check=full to see details of leaked memory.
> 


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