#20988 [Fbk->Opn]: Apache segfaults using MM session on garbage collection

ID: 20988 User updated by: verx@implix.com Reported By: verx@implix.com -Status: Feedback +Status: Open Bug Type: Session related Operating System: Linux 2.4.19 (Debian) PHP Version: 4.3.0RC3 New Comment: I know it's not a backtrace. I have just forgot to paste apache log segfault line example in my original posting. However. When trying to backtrace I cannot reproduce this behavior. It's happening under constant heavy load that can be simulated using ab -n 10000 and the example script I have supplied. Only after about 3000-4000 request this one happens. I cannot execute 3000 request because httpd -X exits after several hundred requests (normal exit - no backtrace) and I don't know why. Previous Comments: ------------------------------------------------------------------------ [2002-12-13 07:01:55] derick@php.net That is not a back trace, please follow the instructions as described here: http://bugs.php.net/bugs-generating-backtrace.php ------------------------------------------------------------------------ [2002-12-13 07:00:15] verx@implix.com Apache segfault log entry: [Sat Dec 14 03:41:39 2002] [notice] child pid 3613 exit signal Segmentation fault (11) ------------------------------------------------------------------------ [2002-12-13 06:56:27] verx@implix.com of course there should be: <? session_start(); $_SESSION['temp'] = 'test'; ?> semicolon missing ------------------------------------------------------------------------ [2002-12-13 06:55:24] derick@php.net Thank you for this bug report. To properly diagnose the problem, we need a backtrace to see what is happening behind the scenes. To find out how to generate a backtrace, please read http://bugs.php.net/bugs-generating-backtrace.php Once you have generated a backtrace, please submit it to this bug report and change the status back to "Open". Thank you for helping us make PHP better. ------------------------------------------------------------------------ [2002-12-13 06:54:22] verx@implix.com Apache 1.3.27 PHP 4.3.0RC3: Configure Command => './configure' '--with-mysql' '--with-dom' '--with-dom-xslt' '--with-apxs=/usr/bin/apxs' '--with-zlib' '--with-mm' This can be reproduced by a script: <? session_start() $_SESSION['temp'] = 'test'; ?> in php.ini set garbage collection to be called often and set MM session handler: session.save_handler = mm session.gc_probability = 1 session.gc_dividend = 1 session.gc_maxlifetime = 30 To reproduce run: ab -n 10000 http://server/above_script.php Note that this bug is also reproducible on FreeBSD with php 4.3.2 - will not post another bug report. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=20988&edit=1