ID: 34232
User updated by: anders at kaseorg dot com
Reported By: anders at kaseorg dot com
Status: Assigned
Bug Type: Reproducible crash
Operating System: Linux (Fedora Core 4)
PHP Version: 5.0.4
Assigned To: rrichards
New Comment:
Not sure whether you still need this information, but yeah, the
snapshot crashes too.
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1208449360 (LWP 30882)]
php_libxml_decrement_node_ptr (object=0xa1ea508)
at php5-200508241430/ext/libxml/libxml.c:861
861 ret_refcount = --obj_node->refcount;
(gdb) bt
#0 php_libxml_decrement_node_ptr (object=0xa1ea508)
at php5-200508241430/ext/libxml/libxml.c:861
#1 0x08069605 in php_libxml_unregister_node (nodep=Variable "nodep" is
not available.
)
at php5-200508241430/ext/libxml/libxml.c:139
#2 0x0806968f in php_libxml_node_free_list (node=Variable "node" is
not available.
)
at php5-200508241430/ext/libxml/libxml.c:230
#3 0x080696b4 in php_libxml_node_free_list (node=Variable "node" is
not available.
)
at php5-200508241430/ext/libxml/libxml.c:221
#4 0x080696fd in php_libxml_node_free_resource (node=0xa1ea510)
at php5-200508241430/ext/libxml/libxml.c:934
#5 0x0806977d in php_libxml_node_decrement_resource
(object=0xa1ea56c)
at php5-200508241430/ext/libxml/libxml.c:957
#6 0x080807dd in dom_objects_free_storage (object=0xa1ea56c)
at php5-200508241430/ext/dom/php_dom.c:901
#7 0x0813503a in zend_objects_store_del_ref (zobject=0xa1ef55c)
at php5-200508241430/Zend/zend_objects_API.c:161
#8 0x081169c9 in _zval_ptr_dtor (zval_ptr=0xa1ea630)
at php5-200508241430/Zend/zend_variables.h:35
#9 0x0812774f in zend_hash_apply_deleter (ht=0x8225a50, p=0xa1ea624)
at php5-200508241430/Zend/zend_hash.c:574
#10 0x0812788f in zend_hash_graceful_reverse_destroy (ht=0x8225a50)
at php5-200508241430/Zend/zend_hash.c:640
#11 0x08116862 in shutdown_executor ()
at php5-200508241430/Zend/zend_execute_API.c:216
#12 0x08120d40 in zend_deactivate ()
at php5-200508241430/Zend/zend.c:823
#13 0x080edc44 in php_request_shutdown (dummy=0x0)
at php5-200508241430/main/main.c:1241
#14 0x0819f14c in main (argc=1, argv=0xbf8a07f4)
at php5-200508241430/sapi/cli/php_cli.c:1142
Previous Comments:
------------------------------------------------------------------------
[2005-08-24 15:42:16] [EMAIL PROTECTED]
Not yet sure if this will require changes to DOM and SimpleXML or
libxml2 specific bug. Assigning to self for now.
Current work around: Don't add meta element as its going to be
destroyed and a new one added anyways when serializing.
------------------------------------------------------------------------
[2005-08-24 11:34:34] [EMAIL PROTECTED]
Please try using this CVS snapshot:
http://snaps.php.net/php5-latest.tar.gz
For Windows:
http://snaps.php.net/win32/php5-win32-latest.zip
------------------------------------------------------------------------
[2005-08-24 10:55:24] anders at kaseorg dot com
Description:
------------
Running PHP (5.0.4-10.3 on Fedora Core 4) on this code crashes with a
"double free" error after producing correct output. If you comment the
last appendChild line, it segfaults instead.
Reproduce code:
---------------
<?php
$imp = new DOMImplementation();
$doc = $imp->createDocument(
'http://www.w3.org/1999/xhtml',
'html',
$imp->createDocumentType('html',
'-//W3C//DTD XHTML 1.0 Strict//EN',
'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd')
);
$html = $doc->documentElement;
$head = $html->appendChild($doc->createElement('head'));
$meta = $head->appendChild($doc->createElement('meta'));
$meta->setAttribute('http-equiv', 'Content-Type');
$meta->setAttribute('content', 'application/xhtml+xml;
charset=utf-8');
$head->appendChild($doc->createElement('title'));
echo $doc->saveXML();
?>
Expected result:
----------------
<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";>
<html xmlns="http://www.w3.org/1999/xhtml";><head><meta
http-equiv="Content-Type" content="text/html; charset=UTF-8"
/><title></title></head></html>
Actual result:
--------------
<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";>
<html xmlns="http://www.w3.org/1999/xhtml";><head><meta
http-equiv="Content-Type" content="text/html; charset=UTF-8"
/><title></title></head></html>
*** glibc detected *** php: double free or corruption (!prev):
0x0985dcf0 ***
======= Backtrace: =========
/lib/libc.so.6[0x984124]
/lib/libc.so.6(__libc_free+0x77)[0x98465f]
/usr/lib/libxml2.so.2(xmlFreeNode+0x1ce)[0x7535b66]
php[0x80728be]
php[0x80733cb]
php[0x807339f]
php(php_libxml_node_free_resource+0x3f)[0x8073423]
php(php_libxml_node_decrement_resource+0x41)[0x807349b]
/usr/lib/php/modules/dom.so(dom_objects_free_storage+0x54)[0xc14576]
php(zend_objects_store_del_ref+0x72)[0x8187e48]
php(_zval_ptr_dtor+0x36)[0x8168e3c]
php[0x8179ffc]
php(zend_hash_graceful_reverse_destroy+0x18)[0x817a116]
php(shutdown_executor+0x7c)[0x8169a60]
php(zend_deactivate+0x93)[0x81740de]
php(php_request_shutdown+0x180)[0x813e197]
php(main+0x174)[0x81a7895]
/lib/libc.so.6(__libc_start_main+0xdf)[0x935d5f]
php[0x80727b1]
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=34232&edit=1
