On 2/15/11 7:21 AM, Adrian Knoth wrote: > Hi! > > I've built a debug version of librdf and found the following code: > > librdf_parser_raptor_constructor (world=0x877e5a0) at > rdf_parser_raptor.c:1328 > 1328 syntax_name = desc->names[0]; > (gdb) bt > #0 librdf_parser_raptor_constructor (world=0x877e5a0) > at rdf_parser_raptor.c:1328 > #1 0xb65b27bd in librdf_init_parser (world=0x877e5a0) at rdf_parser.c:55 > #2 0xb65a3ca5 in librdf_world_open (world=0x877e5a0) at rdf_init.c:303 > #3 0xb64e739c in slv2_world_new () from /usr/lib/libslv2.so.9 > #4 0xb7f6b3a9 in ARDOUR::LV2World::LV2World() () > from /usr/lib/ardour2/libardour.so > #5 0xb7eaefd4 in ARDOUR::PluginManager::PluginManager() () > from /usr/lib/ardour2/libardour.so > #6 0xb7e5a184 in ARDOUR::init(bool, bool) () > from /usr/lib/ardour2/libardour.so > #7 0x08165255 in ARDOUR_UI::ARDOUR_UI(int*, char***) () > #8 0x08392e5b in main () > (gdb) frame 0 > #0 librdf_parser_raptor_constructor (world=0x877e5a0) > at rdf_parser_raptor.c:1328 > 1328 syntax_name = desc->names[0]; > (gdb) list > 1323 if(!desc) { > 1324 /* reached the end of the parsers, now register the > default one */ > 1325 i = 0; > 1326 desc = > raptor_world_get_parser_description(world->raptor_world_ptr, i); > 1327 } > 1328 syntax_name = desc->names[0]; > 1329 syntax_label = desc->label; > 1330 if(desc->mime_types) > 1331 mime_type = desc->mime_types[0].mime_type; > 1332 if(desc->uri_strings) > (gdb) p desc > $1 = (const raptor_syntax_description *) 0x0 > > > This code has been added after librdf0-1.0.10 for librdf-1.0.11. > Obviously, description is NULL, and dereferencing it causes the > segfault. > > I wonder if raptor_world_get_parser_description should have returned > something different. I cannot judge if it's something big or if a simple > NULL pointer check in librdf_parser_raptor_constructor would be enough, > maybe also using the old code from 1.0.10 in case of desc==NULL.
The desc should never be NULL since it's running through a list from raptor, and the final one is to get the default parser. The only way this can happen is if raptor wasn't initialised properly, which is my guess here. I suspect ardour is linking to raptor1 and raptor2, and thus crashing. > Dajobe, I guess we could use your input here. ;) > > JFTR, this is the initialization code in libslv2: > > SLV2World > slv2_world_new() > { > SLV2World world = (SLV2World)malloc(sizeof(struct _SLV2World)); > > world->world = librdf_new_world(); > if (!world->world) { > free(world); > return NULL; > } > > world->local_world = true; > > librdf_world_open(world->world); > > return slv2_world_new_internal(world); > } > > > Cheers > _______________________________________________ pkg-multimedia-maintainers mailing list pkg-multimedia-maintainers@lists.alioth.debian.org http://lists.alioth.debian.org/mailman/listinfo/pkg-multimedia-maintainers