From: ts <decoux@...>
Date: 2002-09-27T20:26:30+09:00
Subject: Re: Matz, if you're reading, please scan this email

>>>>> "S" == Sean Chittenden <sean@chittenden.org> writes:

S> ./test/tests.rb -i 0

 Well, if I'm right the problem is in ruby_xml_parser_io_set()

532       rxp->ctxt = ruby_xml_parser_context_new3();
533       data = (rx_io_data *)rxp->data;
534       data->io = io;
535       GetOpenFile(io, fptr);
536       rb_io_check_readable(fptr);
537       f = GetWriteFile(fptr);
538
539       Data_Get_Struct(rxp->ctxt, ruby_xml_parser_context, rxpc);
540       rxpc->ctxt = xmlCreateIOParserCtxt(NULL, NULL,
541                                          (xmlInputReadCallback) ctxtRead,
542                                          (xmlInputCloseCallback) ctxtClose,
543                                          f, XML_CHAR_ENCODING_NONE);

 When the object is garbage collected, ruby call

89      void ruby_xml_parser_context_free(ruby_xml_parser_context *rxpc) {
90        if (rxpc->ctxt != NULL && rxpc->copy == RUBY_LIBXML_ORIG) {
91          xmlFreeParserCtxt(rxpc->ctxt);
92          ruby_xml_parser_count--;
93        }
94
95        if (ruby_xml_parser_count == 0)
96          xmlCleanupParser();
97
98        free(rxpc);
99      }
100

 xmlFreeParserCtxt() call ctxtClose() but the original object (data->io)
 was previously closed by ruby : explicitely or the garbage collector has
 found it before it try to release rxp->ctxt.

 The segfault is just because you call close() on a already closed IO.


Guy Decoux