Bug #75882 [Fbk]: a simple way for segfaults in threadsafe php just with configuration

Edit report at https://bugs.php.net/bug.php?id=75882&edit=1 ID: 75882 Updated by: ab@php.net Reported by: hajo dot locke at gmx dot de Summary: a simple way for segfaults in threadsafe php just with configuration Status: Feedback Type: Bug Package: Apache2 related Operating System: Ubuntu 16.04 PHP Version: 7.2.1 Block user comment: N Private report: N New Comment: 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 for *NIX and http://bugs.php.net/bugs-generating-backtrace-win32.php for Win32 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. Previous Comments: ------------------------------------------------------------------------ [2018-01-29 08:58:22] ab@php.net Thanks for the report. As discussed on the ML, this quick description didn't reproduce any crash. Please put - the backtrace you receive - the concrete configuration reproducing the crash Thanks. ------------------------------------------------------------------------ [2018-01-29 08:02:36] hajo dot locke at gmx dot de Description: ------------ This is a easy way to have massive segfaults in threadsafe php, just without code, only configuration is needed. - compile a minimal threadsafe libphp7.so and enable thread safety ./configure --disable-all --enable-static --prefix=/usr --with-apxs2=/usr/bin/apxs2 --enable-maintainer-zts - just load this libphp7.so into apache2. no further configuration needed. LoadModule php7_module /usr/lib/apache2/modules/libphp7.so - activate a threadsafe mpm in apache like mpm_worker/mpm_event a2enmod mpm_event - add a php_value directive in VHost-Config for this particular VHost along with a php_value directive in .htaccess in docroot of this VHost. It is not needed to request a php-file, just requesting a small static file is enough. The smaller the requested file and higher requests per second the higher is count of segfaults. you can do some mass-requests with ab from apache2-utils or h2load. Test script: --------------- none Expected result: ---------------- i expect to have no segfaults and every single request should be served fine. Actual result: -------------- You will see massive segfaults and failed requests. threadsafe php is currently not able to edit environment of each request safely. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=75882&edit=1