crash with certain PREFIX situations

[tgpfeiffer]

I'm using sparql-query to issue a federated SPARQL query against a local endpoint. The statement

SELECT * WHERE {
  SERVICE <http://dbpedia.org/sparql/>
  {
    SELECT ?res WHERE {
      ?res <http://www.w3.org/2000/01/rdf-schema#label> "Mathematik"@de .
    }
  }
}

will return the resource <http://dbpedia.org/resource/Mathematics> as intended, while the equivalent query

PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>

SELECT * WHERE {
  SERVICE <http://dbpedia.org/sparql/>
  {
    SELECT ?res WHERE {
      ?res rdfs:label "Mathematik"@de .
    }
  }
}

will crash sparql-query:

*** glibc detected *** sparql-query/sparql-query: double free or corruption (fasttop): 0x09b97300 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6(+0x6b591)[0xb73fb591]
/lib/tls/i686/cmov/libc.so.6(+0x6cde8)[0xb73fcde8]
/lib/tls/i686/cmov/libc.so.6(cfree+0x6d)[0xb73ffecd]
/lib/libglib-2.0.so.0(g_free+0x36)[0xb7702fc6]
sparql-query/sparql-query[0x804bfea]
sparql-query/sparql-query[0x8049e1e]
sparql-query/sparql-query[0x804a8e5]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe6)[0xb73a6bd6]
sparql-query/sparql-query[0x8049b51]

When omitting the PREFIX, sparql-query will display Missing PREFIXes, adding: PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> and return fine with the expected resource.

The endpoint I'm issuing the query against (which itself stores no triples) is a Joseki server.

[swh]

Hi, that's a known problem, and I think it may be fixed in git HEAD, but I'm on holiday for a week or so, and can't check now.

• Steve

Sent on the move.

On 7 Jul 2011, at 21:22, tgpfeifferreply@reply.github.com wrote:

I'm using sparql-query to issue a federated SPARQL query against a local endpoint. The statement

SELECT * WHERE {
SERVICE http://dbpedia.org/sparql/
{
SELECT ?res WHERE {
?res http://www.w3.org/2000/01/rdf-schema#label "Mathematik"@de .
}
}
}

will return the resource <http://dbpedia.org/resource/Mathematics> as intended, while the equivalent query

PREFIX rdfs: http://www.w3.org/2000/01/rdf-schema#

SELECT * WHERE {
SERVICE http://dbpedia.org/sparql/
{
SELECT ?res WHERE {
?res rdfs:label "Mathematik"@de .
}
}
}

will crash sparql-query:

*** glibc detected *** sparql-query/sparql-query: double free or corruption (fasttop): 0x09b97300 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6(+0x6b591)[0xb73fb591]
/lib/tls/i686/cmov/libc.so.6(+0x6cde8)[0xb73fcde8]
/lib/tls/i686/cmov/libc.so.6(cfree+0x6d)[0xb73ffecd]
/lib/libglib-2.0.so.0(g_free+0x36)[0xb7702fc6]
sparql-query/sparql-query[0x804bfea]
sparql-query/sparql-query[0x8049e1e]
sparql-query/sparql-query[0x804a8e5]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe6)[0xb73a6bd6]
sparql-query/sparql-query[0x8049b51]

When omitting the PREFIX, sparql-query will display Missing PREFIXes, adding: PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> and return fine with the expected resource.

The endpoint I'm issuing the query against (which itself stores no triples) is a Joseki server.

Reply to this email directly or view it on GitHub:
#3

[swh]

Yes, it's fixed in HEAD.

[tgpfeiffer]

Which commit is this change in? In f45c3bd, sparql-query still crashes for me with the above query.

[swh]

Sorry, you're right it does still crash with that version, I'll look at it later today.

[swh]

OK, I think this is now fixed in 1560408, can you test?

[tgpfeiffer]

Yes, works, thank you!