Edit report at https://bugs.php.net/bug.php?id=55414&edit=1
ID: 55414
Comment by: jbboehr at gmail dot com
Reported by: jbboehr at gmail dot com
Summary: Segmentation fault with
MySQLi_Result::fetch_fields()
Status: Open
Type: Bug
Package: MySQLi related
Operating System: CentOS release 5.6 (Final)
PHP Version: 5.3.6
Block user comment: N
Private report: N
New Comment:
PS Thanks for the gdb
Previous Comments:
------------------------------------------------------------------------
[2011-08-16 01:48:02] jbboehr at gmail dot com
@lgandras For now, we're just using a work-around case for MySQLi, maybe it'll
help you:
if( $adapter instanceof Zend_Db_Adapter_Mysqli ) {
// Fixes MySQLI segfault in fetch_fields() with SHOW ENGINES
$connection = $adapter->getConnection();
$result = mysqli_query($connection, 'SHOW ENGINES');
if ( !$result instanceof MySQLi_STMT ){
return $this->_error('badAdapter');
}
$data = array();
while ( $row = $result->fetch_array() ){
$data[] = $row;
}
} else {
try {
$data = $adapter->query('SHOW ENGINES')->fetchAll();
} catch( Exception $e ) {
return $this->_error('badAdapter');
}
}
------------------------------------------------------------------------
[2011-08-16 01:33:19] lgandras at gmail dot com
Hi,
Thank you so much. I was just posting my bug without a reproducible script
https://bugs.php.net/bug.php?id=55431. Here's your gdb =)
#0 0x0841f2e8 in add_property_string_ex (arg=0x907af64, key=0x87ad4cc
"catalog", key_len=8, str=0x31313230 <Address 0x31313230 out of bounds>,
duplicate=1)
at /home/cpeasyapache/src/php-5.3.6/Zend/zend_API.c:1524
#1 0x081d7628 in php_add_field_properties (value=0x907af64, field=0x90fc6e0)
at /home/cpeasyapache/src/php-5.3.6/ext/mysqli/mysqli_api.c:1056
#2 0x081d79b7 in zif_mysqli_fetch_fields (ht=0, return_value=0x907ae80,
return_value_ptr=0x0, this_ptr=0x907a9e8, return_value_used=0)
at /home/cpeasyapache/src/php-5.3.6/ext/mysqli/mysqli_api.c:1114
#3 0x0844632f in zend_do_fcall_common_helper_SPEC (execute_data=0x90a6e50) at
/home/cpeasyapache/src/php-5.3.6/Zend/zend_vm_execute.h:316
#4 0x08446f6b in ZEND_DO_FCALL_BY_NAME_SPEC_HANDLER (execute_data=0x90a6e50)
at /home/cpeasyapache/src/php-5.3.6/Zend/zend_vm_execute.h:421
#5 0x084456fe in execute (op_array=0x90783f0) at
/home/cpeasyapache/src/php-5.3.6/Zend/zend_vm_execute.h:107
#6 0x08419b44 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at
/home/cpeasyapache/src/php-5.3.6/Zend/zend.c:1194
#7 0x083ad584 in php_execute_script (primary_file=0xbf8cbb04) at
/home/cpeasyapache/src/php-5.3.6/main/main.c:2268
#8 0x084e6f64 in main (argc=2, argv=0xbf8cbc64) at
/home/cpeasyapache/src/php-5.3.6/sapi/cli/php_cli.c:1193
I'm exactly in the same situation as you. I can't use PHP 5.3.6. This doesn't
seem to happen in PHP 5.3.5.
------------------------------------------------------------------------
[2011-08-13 01:00:56] jbboehr at gmail dot com
Ok, so gdb was not installed on the server (sigh), however here's part of the
strace, maybe that will help.
connect(4, {sa_family=AF_FILE, path="/var/lib/mysql/mysql.sock"...}, 110) = 0
setsockopt(4, SOL_SOCKET, SO_RCVTIMEO, "\2003\341\1\0\0\0\0\0\0\0\0\0\0\0\0",
16) = 0
setsockopt(4, SOL_SOCKET, SO_SNDTIMEO, "\2003\341\1\0\0\0\0\0\0\0\0\0\0\0\0",
16) = 0
setsockopt(4, SOL_IP, IP_TOS, [8], 4) = -1 EOPNOTSUPP (Operation not
supported)
setsockopt(4, SOL_SOCKET, SO_KEEPALIVE, [1], 4) = 0
read(4, ">\0\0\0\n5.0.92-community\0\350\352^\0@Dp,%u"..., 16384) = 66
stat("/usr/share/mysql/charsets/Index.xml", {st_mode=S_IFREG|0755,
st_size=18173, ...}) = 0
open("/usr/share/mysql/charsets/Index.xml", O_RDONLY) = 5
read(5, "<?xml version='1.0' encoding=\"ut"..., 18173) = 18173
close(5) = 0
write(4,
"Y\0\0\1\215\242\2\0\0\0\0@\10\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 93) =
93
read(4, "\7\0\0\2\0\0\0\2\0\0\0", 16384) = 11
poll([{fd=4, events=POLLIN|POLLPRI}], 1, 0) = 0 (Timeout)
write(4, "\r\0\0\0\26SHOW ENGINES", 17) = 17
read(4, "\f\0\0\1\0\1\0\0\0\0\0\0\0\0\0\0", 16384) = 16
poll([{fd=4, events=POLLIN|POLLPRI}], 1, 0) = 0 (Timeout)
write(4, "\n\0\0\0\27\1\0\0\0\0\1\0\0\0", 14) = 14
read(4, "\1\0\0\1\3\34\0\0\2\3def\0\0\0\6Engine\0\f\10\0\n\0\0\0\375"...,
16384)
= 826
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++
------------------------------------------------------------------------
[2011-08-13 00:37:27] jbboehr at gmail dot com
Description:
------------
A segmentation fault is occurring for us when the following is done:
-Run SHOW ENGINES as a prepared statement
-Call MySQLi_STMT::fetch_metadata()
-Call MySQLi_Result::fetch_fields() on the result.
This is using the Zend Framework (Zend_Db_Adapter_Mysql), however the test
script below successfully replicated the segfault.
We have had at least 30 people with the issue (we sell a PHP script), out of
maybe a thousand or so.
Unfortunately, this isn't my server, so I can't include a backtrace. Here is
someone else having a similar problem with SHOW CREATE TABLE:
http://stackoverflow.com/questions/6769515/php-programming-seg-fault
PHP Version => 5.3.6
Configure Command => './configure' '--disable-fileinfo' '--enable-bcmath' '--
enable-calendar' '--enable-exif' '--enable-ftp' '--enable-gd-native-ttf' '--
enable-libxml' '--enable-magic-quotes' '--enable-mbstring'
'--enable-pdo=shared'
'--enable-sockets' '--enable-zend-multibyte' '--enable-zip' '--
prefix=/usr/local' '--with-apxs2=/usr/local/apache/bin/apxs' '--with-bz2' '--
with-curl=/opt/curlssl/' '--with-curlwrappers' '--with-freetype-dir=/usr' '--
with-gd' '--with-gettext' '--with-imap=/opt/php_with_imap_client/' '--with-imap-
ssl=/usr' '--with-jpeg-dir=/usr' '--with-kerberos' '--with-libdir=lib64' '--
with-libexpat-dir=/usr' '--with-libxml-dir=/opt/xml2/' '--with-
mcrypt=/opt/libmcrypt/' '--with-mm=/opt/mm/' '--with-mysql=/usr' '--with-mysql-
sock=/var/lib/mysql/mysql.sock' '--with-mysqli=/usr/bin/mysql_config' '--with-
openssl=/usr' '--with-openssl-dir=/usr' '--with-pcre-regex=/opt/pcre' '--with-
pdo-mysql=shared' '--with-pdo-sqlite=shared' '--with-pic' '--with-png-dir=/usr'
'--with-pspell' '--with-sqlite=shared' '--with-tidy=/opt/tidy/' '--with-xmlrpc'
'--with-xpm-dir=/usr' '--with-xsl=/opt/xslt/' '--with-zlib' '--with-zlib-
dir=/usr'
mysqli
MysqlI Support => enabled
Client API library version => 5.0.92
Active Persistent Links => 0
Inactive Persistent Links => 0
Active Links => 0
Client API header version => 5.0.92
MYSQLI_SOCKET => /var/lib/mysql/mysql.sock
Directive => Local Value => Master Value
mysqli.allow_local_infile => On => On
mysqli.allow_persistent => On => On
mysqli.default_host => no value => no value
mysqli.default_port => 3306 => 3306
mysqli.default_pw => no value => no value
mysqli.default_socket => /var/lib/mysql/mysql.sock => /var/lib/mysql/mysql.sock
mysqli.default_user => no value => no value
mysqli.max_links => Unlimited => Unlimited
mysqli.max_persistent => Unlimited => Unlimited
mysqli.reconnect => Off => Off
+-----------------------------------------+-------------------------------------
-------------+
| Variable_name | Value
|
+-----------------------------------------+-------------------------------------
-------------+
| version | 5.0.92-community
|
| version_comment | MySQL Community Edition (GPL)
|
+-----------------------------------------+-------------------------------------
-------------+
Linux ***** 2.6.18-***** #1 SMP Wed Jan 5 17:52:25 EST 2011 x86_64 x86_64
x86_64
GNU/Linux
Test script:
---------------
$mysqli = new mysqli($host, $username, $password, $dbname);
$stmt = $mysqli->prepare('SHOW ENGINES');
$stmt->execute();
$stmt->bind_result($engine, $support, $comment);
$meta = $stmt->result_metadata();
$meta->fetch_fields();
$stmt->close();
$mysqli->close();
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=55414&edit=1
