From: Sjon at react dot nl
Operating system: Linux
PHP version: 5.2.9RC1
PHP Bug Type: *General Issues
Bug description: segfault when connecting while unbuffered query is running
Description:
------------
PHP Segfaults when establishing a second connection when an unbuffered
query is running
Since I cannot report a bug in 5.2.8; I compiled php5.2-200902120730 and
reproduced the bug with that version
$ ./configure --with-mysql=shared
$ make
$ ./sapi/cli/php -v
PHP 5.2.9RC2-dev (cli) (built: Feb 12 2009 10:52:08)
Copyright (c) 1997-2009 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend Technologies
$ ./sapi/cli/php -n -d extension_dir=./modules/ -d extension=mysql.so
mysql-unbuffered-crash.php
Reproduce code:
---------------
<?PHP
$rl1 = mysql_connect('localhost','Sjon','test') or die (mysql_error());
mysql_query("DROP DATABASE IF EXISTS mysql_unbuffered_crash");
mysql_query("CREATE DATABASE mysql_unbuffered_crash");
mysql_select_db('mysql_unbuffered_crash') or die (mysql_error());
mysql_query("CREATE TABLE test (`data` VARCHAR( 256 ) NOT NULL) ENGINE =
innodb;");
mysql_query("INSERT INTO test VALUES ('asdf');");
$rs = mysql_unbuffered_query("SELECT data FROM test"); # passing $rl1 will
fix it
while ($r = mysql_fetch_assoc($rs))
{
// Setup another connection so we don't disturb the unbuffered_query
$rl2 = mysql_connect('localhost','Sjon','test', TRUE) or die
(mysql_error($rl2));
mysql_select_db('mysql_unbuffered_crash', $rl2) or die
(mysql_error($rl2));
var_dump($r);
}
echo 'SUCCESS';
Expected result:
----------------
array(1) {
["data"]=>
string(4) "asdf"
}
SUCCESS
Actual result:
--------------
array(1) {
["data"]=>
string(4) "asdf"
}
SUCCESS
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7d4f6c0 (LWP 21345)]
zend_mm_add_to_free_list (heap=<value optimized out>, mm_block=0x9ee4e30)
at /tmp/php5.2-200902120730/Zend/zend_alloc.c:747
747 if (ZEND_MM_FREE_BLOCK_SIZE(prev) !=
size) {
(gdb) bt
#0 zend_mm_add_to_free_list (heap=<value optimized out>,
mm_block=0x9ee4e30)
at /tmp/php5.2-200902120730/Zend/zend_alloc.c:747
#1 0x0826790b in _zend_mm_free_int (heap=0x9e2c1e8, p=<value optimized
out>)
at /tmp/php5.2-200902120730/Zend/zend_alloc.c:1987
#2 0x08277445 in shutdown_executor ()
at /tmp/php5.2-200902120730/Zend/zend_execute_API.c:283
#3 0x08281aa3 in zend_deactivate ()
at /tmp/php5.2-200902120730/Zend/zend.c:860
#4 0x08240857 in php_request_shutdown (dummy=0x0)
at /tmp/php5.2-200902120730/main/main.c:1492
#5 0x082ecd71 in main (argc=7, argv=0xbf9c1a44)
at /tmp/php5.2-200902120730/sapi/cli/php_cli.c:1314
--
Edit bug report at http://bugs.php.net/?id=47367&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=47367&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=47367&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=47367&r=trysnapshot60
Fixed in CVS:
http://bugs.php.net/fix.php?id=47367&r=fixedcvs
Fixed in CVS and need be documented:
http://bugs.php.net/fix.php?id=47367&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=47367&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=47367&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=47367&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=47367&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=47367&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=47367&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=47367&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=47367&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=47367&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=47367&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=47367&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=47367&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=47367&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=47367&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=47367&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=47367&r=mysqlcfg
