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Rusty Conover | 17 Dec 2007 07:57

Crashes with spelling enabled and perl.

Hi Guys,

Here's a simple test case that causes a segfault with the perl bindings patched to enable spelling correction:

use strict;
use warnings;
use Search::Xapian;
my $db = Search::Xapian::WritableDatabase->new("test.db", Search::Xapian::DB_CREATE_OR_OPEN);
if (!defined($db)) {
    die("Failed to open xapian_database: $!");
  }
my $indexer = Search::Xapian::TermGenerator->new();
$indexer->set_flags(Search::Xapian::FLAG_SPELLING);
my $document = Search::Xapian::Document->new();
$indexer->set_document($document);
$indexer->index_text(lc('test'), 1);
$db->add_document($document);
undef $db;  

Here's the patch to enable spelling against Search-Xapian-1.0.4.0:


Here's the backtrace against 1.0.4:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1208211776 (LWP 27230)]
0x001c9bbc in Xapian::WritableDatabase::add_spelling (this=0x9d77de0, word= <at> 0xbf846fa0, freqinc=1) at ./include/xapian/base.h:154
154         return dest;
Current language:  auto; currently c++
(gdb) bt
#0  0x001c9bbc in Xapian::WritableDatabase::add_spelling (this=0x9d77de0, word= <at> 0xbf846fa0, freqinc=1) at ./include/xapian/base.h:154
#1  0x0032608a in Xapian::TermGenerator::Internal::index_text (this=0x9d77dc8, itor={p = 0x0, end = 0x9cb5db8 "", seqlen = 0}, weight=1,
    prefix= <at> 0xbf84703c, with_positions=true) at queryparser/termgenerator_internal.cc:207
#2  0x0032506c in Xapian::TermGenerator::index_text (this=0x9c94cd0, itor= <at> 0xbf84702c, weight=1, prefix= <at> 0xbf84703c) at queryparser/termgenerator.cc:90
#3  0x0017100e in XS_Search__Xapian__TermGenerator_index_text (my_perl=0x9c78008, cv=0x9d7f7e8) at /usr/local/include/xapian/termgenerator.h:115
#4  0x00c3142d in Perl_pp_entersub () from /usr/lib/perl5/5.8.8/i386-linux-thread-multi/CORE/libperl.so
#5  0x00c2a88f in Perl_runops_standard () from /usr/lib/perl5/5.8.8/i386-linux-thread-multi/CORE/libperl.so
#6  0x00bd010e in perl_run () from /usr/lib/perl5/5.8.8/i386-linux-thread-multi/CORE/libperl.so
#7  0x0804921e in main ()

Any help would be great as I'm excited to get spelling correction working.

Thanks,

Rusty
--
Rusty Conover
InfoGears Inc.


 

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Olly Betts | 18 Dec 2007 02:46
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Re: Crashes with spelling enabled and perl.

On Sun, Dec 16, 2007 at 11:57:15PM -0700, Rusty Conover wrote:
> my $db = Search::Xapian::WritableDatabase->new("test.db",  
> Search::Xapian::DB_CREATE_OR_OPEN);
> if (!defined($db)) {
>     die("Failed to open xapian_database: $!");
>   }
> my $indexer = Search::Xapian::TermGenerator->new();
> $indexer->set_flags(Search::Xapian::FLAG_SPELLING);

You need to add this line here so that the TermGenerator object knows
which database to add spellings to:

$indexer->set_database($db);

But a SEGV is undesirable.  I'll see if I can fix that.

Cheers,
    Olly
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