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[2012-01-11 15:44 UTC] martin at martins-creations dot co dot uk
Description:
------------
I can fix this segfault by either removing the ATTR_PERSISTENT option, or by
assigning parent::prepare to a local variable (i.e. $stmt =
parent::prepare('...'))
Also worth nothing I had to compile PHP as shared due to a bug when trying to
compile the extension with mysqlnd which is filed in a separate report.
Linux localdev 3.1.0-1-amd64 #1 SMP Fri Dec 23 16:37:11 UTC 2011 x86_64 GNU/Linux
$ php -v
PHP 5.4.0RC5 (cli) (built: Jan 10 2012 19:42:22)
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies
$ phpize -v
Configuring for:
PHP Api Version: 20100412
Zend Module Api No: 20100525
Zend Extension Api No: 220100525
$ cat /etc/issue
Debian GNU/Linux wheezy/sid \n \l
$ mysql --version
mysql Ver 14.14 Distrib 5.1.58, for debian-linux-gnu (x86_64) using readline 6.2
Test script:
---------------
<?php
class BuggedPDO extends PDO {
protected $stmt = null;
public function __construct() {
$options = array(
\PDO::ATTR_PERSISTENT => true,
\PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
);
try {
parent::__construct('mysql:dbname=testdb;host=localhost', 'testuser', 'testpass', $options);
$this->stmt = parent::prepare('select * from table');
} catch (\Exception $ex) {
var_dump($ex);
}
}
}
$test = new BuggedPDO();
Expected result:
----------------
A proper resource in $this->stmt
Actual result:
--------------
Jan 11 10:26:00 kernel: [ 956.330577] php-fpm[2255]: segfault at 0 ip
0000000000729beb sp 00007fffad56c8e0 error 4 in php-fpm[400000+76d000]
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Program received signal SIGSEGV, Segmentation fault. 0x000000000072893b in zend_std_write_property (object=0x7ffff7fd6070, member=0x7ffff7fda308, value=0x7ffff7fd7cf8, key=<optimized out>) at /usr/local/src/php-5.4.0RC5/Zend/zend_object_handlers.c:526 526 ((variable_ptr = (zval**)zobj->properties_table[property_info- >offset]) != NULL) : (gdb) bt #0 0x000000000072893b in zend_std_write_property (object=0x7ffff7fd6070, member=0x7ffff7fda308, value=0x7ffff7fd7cf8, key=<optimized out>) at /usr/local/src/php-5.4.0RC5/Zend/zend_object_handlers.c:526 #1 0x0000000000775f07 in zend_assign_to_object (retval=0x0, object_ptr=0xe257c0, property_name=0x7ffff7fda308, value_type=4, value_op=<optimized out>, Ts= <optimized out>, opcode=136, key=0x7ffff7fda308) at /usr/local/src/php- 5.4.0RC5/Zend/zend_execute.c:738 #2 0x0000000000776934 in ZEND_ASSIGN_OBJ_SPEC_UNUSED_CONST_HANDLER (execute_data=0x7ffff7fa41c0) at /usr/local/src/php- 5.4.0RC5/Zend/zend_vm_execute.h:22003 #3 0x00000000007642df in execute (op_array=0x7ffff7fd8d60) at /usr/local/src/php-5.4.0RC5/Zend/zend_vm_execute.h:410 #4 0x0000000000704db9 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /usr/local/src/php-5.4.0RC5/Zend/zend.c:1272 #5 0x00000000006a557c in php_execute_script (primary_file=0x7fffffffe890) at /usr/local/src/php-5.4.0RC5/main/main.c:2476 #6 0x00000000007ac401 in do_cli (argc=2, argv=0x7fffffffec68) at /usr/local/src/php-5.4.0RC5/sapi/cli/php_cli.c:983 #7 0x000000000042ed5c in main (argc=2, argv=0x7fffffffec68) at /usr/local/src/php-5.4.0RC5/sapi/cli/php_cli.c:1356