[php-src] Issue #9143: Mysql PDO heap corruption on Win10 x64 1909 (PHP x86 NTS)

Issue: https://github.com/php/php-src/issues/9143 Author: nerdspice ### Description The following code: ```php <?php define('DB_DRIVER', 'mysql'); define('DB_HOST', 'localhost'); define('DB_PORT', 3306); define('DB_USER', '[removed]'); define('DB_PASS', '[removed]'); define('DB_NAME', '[removed]'); define('DB_DSN' , DB_DRIVER.':dbname='.DB_NAME.';host='.DB_HOST.';port='.DB_PORT); $params = array( PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION, PDO::ATTR_PERSISTENT => true, PDO::ATTR_EMULATE_PREPARES => false, PDO::MYSQL_ATTR_INIT_COMMAND => "SET SESSION sql_mode='', group_concat_max_len=32000, time_zone='+00:00'" ); $params[PDO::ATTR_DEFAULT_FETCH_MODE] = PDO::FETCH_OBJ; $handle = new PDO(DB_DSN, DB_USER, DB_PASS, $params); ``` Resulted in this output: Random crashes with the following in Event Viewer: ``` Faulting application name: php-cgi.exe, version: 8.1.8.0, time stamp: 0x62c4c3bb Faulting module name: ntdll.dll, version: 10.0.18362.719, time stamp: 0x832e7bce Exception code: 0xc0000374 Fault offset: 0x000df95d Faulting process id: 0x5458 Faulting application start time: 0x01d8a070256f66a2 Faulting application path: C:\Program Files (x86)\php81\php-cgi.exe Faulting module path: C:\Windows\SYSTEM32\ntdll.dll Report Id: a41ae7dc-55de-4152-b401-9553e23d1b5d Faulting package full name: Faulting package-relative application ID: ``` But I expected this output instead: ``` Successful database connection and no crashing. ``` Other notes: This issue seems to be somewhat random, but I was able to get it to consistently crash if I kill the idle db connection via the sql command kill <id>;, then refresh the page. Using IIS 10 configured to hand-off the request to php via fastcgi. Database server attempting to connect to is on the same machine - Version: 10.4.12-MariaDB-log - Win10 x64. DebugDiag log attached (zipped due to file ext limitation on github). [php-cgi.exe_220725_131714_CrashHangAnalysis.zip](https://github.com/php/php-src/files/9184975/php-cgi.exe_220725_131714_CrashHangAnalysis.zip) ### PHP Version PHP 8.1.8 x86 ### Operating System Windows 10 x64 1909