RE: [PHP-DEV] threadsafe php crashes too easily

Hi, > -----Original Message----- > From: Hajo Locke [mailto:Hajo.Locke@gmx.de] > Sent: Friday, January 26, 2018 12:43 PM > To: internals@lists.php.net > Subject: [PHP-DEV] threadsafe php crashes too easily > > Hello List, > > i hope this is the right place to get helped. I have a promising setup for testing > purposes, but unfortunately i ran quick into problems. > >  I compiled a minimal libphp7.so (7.2.1)  using this line: > ./configure --disable-all  --enable-static --prefix=/usr > --with-apxs2=/usr/bin/apxs2 --enable-maintainer-zts > > I enabled threadsafety to use this libphp7.so in apache 2.4 with a threaded mpm > like worker or event. the plan is to just load it with LoadModule in apache but > not to use it. > the real php-processing is done by a fastcgi-setup in apache using php-fpm (not > needed to reproduce error). the idea is to support php_value/php_flag etc. in > .htaccess files for my users even if they use a fastcgi-setup. all i need is > htscanner extension for php-cgi and just a loaded libphpx.so to register these > directives in apache. may be this is a dump idea, but i have thousands of users > who use libphpx.so and a huge number of .htaccess with php_value/php_flag > directives. currently i see no possibility to tell users to switch to .user.ini > > First steps are really successful and all worked well. Even benchmarking the > system with massrequests did not show any error. php_value/php_flag in > .htaccess showed expected behaviour when requesting a php-file using fastcgi. > Unfortunately there is only a small change to see lots of segfaults in > errorlog: Just enable 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. > I just made a quick try with the way you've described - php_value once in httpd.conf and in .htaccess, but I see no crash. Perhaps you could file a ticket with a more detailed description and a backtrace you currently get. > I knew that threadsafe-compiled php is a problematic thing and recommend > mpm is prefork when not using a fastcgi-configuration, but iam surprised that i > see the crashes so easily. I used a minimal php and it seems problem occurs just > by reading and applying the values set by php_value for particular request. > It depends on what you do. Some dependencies or even functions in the C runtime are not thread safe, one has to be aware what is used by an application. Thanks Anatol