Bug #51091 [Com]: Persistent PDO Connections Crash

Edit report at http://bugs.php.net/bug.php?id=51091&edit=1 ID: 51091 Comment by: dxm007 at gmail dot com Reported by: achristianson at yakabod dot com Summary: Persistent PDO Connections Crash Status: Feedback Type: Bug Package: Reproducible crash Operating System: CentOS 5.4 PHP Version: 5.3.1 Assigned To: dmitry New Comment: Hi, I've been trying to setup Menalto Gallery and after I got through entire setup of a fresh installation (to verify php, MSSQL, IIS were working fine), I pointed the gallery to my existing database and flat files. Because my data came from an older version of the Gallery, it invokes upgrade wizard which dies every single time on step 2. I've created a crash dump with adplus and it appears to be exactly the same bug as what's reported here. This is 100% repeatable on my machine. I'm using PHP 5.3.2 with Windows 2008 Server R2, IIS7 and MSSQL 2008 R2. I've also been able to get past the crash by adding "zend.enable_gc = Off" to php.ini Previous Comments: ------------------------------------------------------------------------ [2010-04-20 18:11:48] dmitry@php.net I'm not able to reproduce it. May be it's already fixed. Could you verify? ------------------------------------------------------------------------ [2010-02-19 16:47:46] johannes@php.net -Status: Open +Status: Assigned -Assigned To: +Assigned To: dmitry Dmitry, can you take a look? - Thanks. ------------------------------------------------------------------------ [2010-02-19 16:09:24] achristianson at yakabod dot com I gave it a try with zend.enable_gc = Off The segmentation fault no longer occurs ------------------------------------------------------------------------ [2010-02-19 15:34:36] rasmus@php.net Looks like a gc issue. Confirm by setting: zend.enable_gc = Off in your php.ini ------------------------------------------------------------------------ [2010-02-19 15:29:20] achristianson at yakabod dot com Description: ------------ * create persistent connection to database; store it to a variable * create an additional persistent connection to database: store it in the same variable * allocate a bunch of memory * PHP segfaults Reproduce code: --------------- <?php $db = connect(); $db = connect(); for($i = 0; $i < 10000; $i++) { $exampleArray[] = new ExampleObject(); } class ExampleObject { } function connect() { return new PDO( 'mysql:host=<db host>;dbname=<db name>', '<db user>', '<db password>', array( PDO::ATTR_PERSISTENT => true )); } Expected result: ---------------- no segmentation fault Actual result: -------------- [New Thread 0xb7f396c0 (LWP 3416)] Program received signal SIGSEGV, Segmentation fault. 0x0853a746 in zobj_mark_grey (obj=0xb7b8e07c, pz=0xbfd1f0c8) at /root/php-5.3.1/Zend/zend_gc.c:383 383 p = Z_OBJPROP_P(pz)->pListHead; (gdb) bt #0 0x0853a746 in zobj_mark_grey (obj=0xb7b8e07c, pz=0xbfd1f0c8) at /root/php-5.3.1/Zend/zend_gc.c:383 #1 0x0853a81e in gc_mark_roots () at /root/php- 5.3.1/Zend/zend_gc.c:410 #2 0x0853af64 in gc_collect_cycles () at /root/php- 5.3.1/Zend/zend_gc.c:628 #3 0x0853a1a9 in gc_zobj_possible_root (zv=0xa06bac8) at /root/php- 5.3.1/Zend/zend_gc.c:221 #4 0x08539f78 in gc_zval_possible_root (zv=0xa06bac8) at /root/php- 5.3.1/Zend/zend_gc.c:143 #5 0x08508570 in _zval_ptr_dtor (zval_ptr=0xbfd1f1ec, __zend_filename=0x88fb070 "/root/php-5.3.1/Zend/zend_vm_execute.h", __zend_lineno=28199) at /root/php-5.3.1/Zend/zend_gc.h:183 #6 0x085d7d24 in ZEND_ASSIGN_DIM_SPEC_CV_UNUSED_HANDLER (execute_data=0x9cccd20) at /root/php- 5.3.1/Zend/zend_vm_execute.h:28199 #7 0x08543e68 in execute (op_array=0x9d12f70) at /root/php- 5.3.1/Zend/zend_vm_execute.h:104 #8 0x08518b68 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /root/php-5.3.1/Zend/zend.c:1194 #9 0x084aecdb in php_execute_script (primary_file=0xbfd216a4) at /root/php-5.3.1/main/main.c:2225 #10 0x085e4fa0 in main (argc=2, argv=0xbfd21804) at /root/php- 5.3.1/sapi/cli/php_cli.c:1190 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=51091&edit=1