ID: 28513 Updated by: [EMAIL PROTECTED] Reported By: bens at effortlessis dot com -Status: Verified +Status: Closed Bug Type: *Regular Expressions Operating System: Fedora Core 1 Linux PHP Version: 4.3.6 Assigned To: hholzgra New Comment:
Thank you for your bug report. This issue has already been fixed in the latest released version of PHP, which you can download at http://www.php.net/downloads.php fixed in 4.3.9 and 5.0.2 Previous Comments: ------------------------------------------------------------------------ [2004-08-23 20:52:12] R3MOV3CAPSphpbugs at R3MOV3CAPSneodisco dot com This is a simple, serious, and ugly ugly bug!!! Took me a while to cut it back, but here is the essence. <?php while (1) { $body = "any string"; $rand = "different strings".mt_rand(0,mt_getrandmax()); $pattern = "/$rand/"; preg_match($pattern, $body, $match); } ?> I am using PHP5.0.0 and PHP5.0.01. These 4 lines chew 50MB per second. Have a nice day. ------------------------------------------------------------------------ [2004-05-25 02:11:51] bens at effortlessis dot com Description: ------------ I wrote a script to parse a sendmail log file to match records together by message id in order to gather some statistics about a particular relay situation. When run, this script quickly swallowed all available RAM, bringing a busy, production system to a standstill. I reduced the script to the simplest code that causes the memory leak. When run as "php -q scriptname.php /var/log/maillog" from the command line, where maillog contains > 500,000 lines, this script will leak memory until the system load average exceeds 5.0. Rem out the preg_match on the innermost loop and the memory leak disappears. This bug is found in 4.3.4 and 4.3.6, I haven't tested other versions. Reproduce code: --------------- <? set_time_limit(0); // GETS $msgid; $match="/\]\:\s+([0-9a-zA-Z]+)\:/"; if (!$file=trim($_SERVER['argv'][1])) die('You must specify maillog file location'); if ($fp=fopen($file, 'r')) { while ($line=fgets($fp, 1024)) if (preg_match($match, $line, $r)) { $msgid=trim($r[1]); //$mfrom="/$msgid\:\s+from=\<*(.*?)[\s\>].*?relay=.*?\[([0-9\.]+)\]/"; $mfrom="/$msgid/"; // REM THIS LINE OUT AND THE MEMORY LEAK STOPS. preg_match($mfrom, $line); } fclose($fp); } ?> Expected result: ---------------- The "top" command should show this PHP instance using < 10% of RAM on a 1 GB RAM system. Actual result: -------------- The "top" command shows > 99% of memory usage on a 1 GB system. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=28513&edit=1