Re: Apache segmentation fault when loading libphp7.so

Could this be a bug in the PHP code: https://bugs.php.net/bug.php?id=78769 Is __builtin_cpu_init part of PHP source code and what does __builtin_cpu_init function do? Is it trying to check for some CPU flags that are not existent on your particular CPU? Keith On 13/08/2020 09:03, Kai Fürstenberg wrote:

Am 12.08.2020 um 22:54 schrieb Keith Roberts:

Hi Kai, Have you uninstalled the debian default distro versions of httpd and PHP as well? I have had issues when compiling apache and PHP with the distro versions installed. They don't always work well side by side.

Hi Keith, I never installed them. The initial installation was a minimal one and I always compiled these programs from source. But I re-checked and I have no distro versions of them. While checking distro or old versions of programs, I deleted any older version of gcc (in case of some lib confusion), but no change. I also checked the source code of PHP: The function __builtin_cpu_init was first used in the 7.3 versions, which explaines why I am not able to use any newer version as 7.2.x atm. In 7.2.33 this function is not used. Kai

Keith On 12/08/2020 17:09, Kai Fürstenberg wrote:

Hello everybody, and thank you for you help so far. I played around with gdb a little bit. I re-configured php the way I did in 7.2 (just with some slight modifications), to use mysql, gd and some other things. But this time, httpd stops with Program received signal SIGSEGV, Segmentation fault. resolve_stripslashes () at /usr/src/apache_testing/php-7.4.9/Zend/zend_cpuinfo.h:157

157             __builtin_cpu_init();

Before I had the fault #0  resolve_base64_decode () at /usr/src/apache_testing/php-7.4.9/Zend/zend_cpuinfo.h:141 Line 141 of zend_cpuinfo.h is the very same command __builtin_cpu_init() It seems, that exactly this command __builtin_cpu_init() fails for some reason... Kai Am 11.08.2020 um 20:24 schrieb kai_lists@fuerstenberg.ws:

Hi Keith, Am 11.08.2020 um 16:51 schrieb Keith Roberts:

You could try logging PHP startup errors: https://www.php.net/manual/en/errorfunc.configuration.php#ini.display-startup-errors

this did not work. I have nothing on my screen or in any log. php -i sais I used the correct php.ini

Or try running Apache daemon using valgrind: https://www.valgrind.org/docs/manual/quick-start.html

This was REALLY strange. I don't know if this is expected behaviour, but using valgrind, the server is up and running. I created a full output, ... (valgrind --leak-check=full --show-leak-kinds=all -v /usr/local/httpd-test/bin/httpd -k start) ... which you can find here: https://pastebin.com/Dwgjxjgj Greets Kai

HTH Keith On 11/08/2020 13:54, Kai Fürstenberg wrote:

Hello Keith, no, it's not mod_alias, because debug log sais the module is loaded. Without mod_alias it looks like below. When I comment out phplib7.so, the server starts and is online. I don't know if it helps: httpd sends a return code 139. PHP in the CLI works. [Tue Aug 11 14:49:21.635494 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module authn_file_module from /usr/local/httpd-test/modules/mod_authn_file.so [Tue Aug 11 14:49:21.635606 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module authn_core_module from /usr/local/httpd-test/modules/mod_authn_core.so [Tue Aug 11 14:49:21.635688 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module authz_host_module from /usr/local/httpd-test/modules/mod_authz_host.so [Tue Aug 11 14:49:21.635796 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module authz_groupfile_module from /usr/local/httpd-test/modules/mod_authz_groupfile.so [Tue Aug 11 14:49:21.635874 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module authz_user_module from /usr/local/httpd-test/modules/mod_authz_user.so [Tue Aug 11 14:49:21.666338 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module authz_core_module from /usr/local/httpd-test/modules/mod_authz_core.so [Tue Aug 11 14:49:21.666433 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module access_compat_module from /usr/local/httpd-test/modules/mod_access_compat.so [Tue Aug 11 14:49:21.666522 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module auth_basic_module from /usr/local/httpd-test/modules/mod_auth_basic.so [Tue Aug 11 14:49:21.666617 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module reqtimeout_module from /usr/local/httpd-test/modules/mod_reqtimeout.so [Tue Aug 11 14:49:21.666713 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module filter_module from /usr/local/httpd-test/modules/mod_filter.so [Tue Aug 11 14:49:21.666805 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module mime_module from /usr/local/httpd-test/modules/mod_mime.so [Tue Aug 11 14:49:21.666907 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module log_config_module from /usr/local/httpd-test/modules/mod_log_config.so [Tue Aug 11 14:49:21.666999 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module env_module from /usr/local/httpd-test/modules/mod_env.so [Tue Aug 11 14:49:21.667102 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module headers_module from /usr/local/httpd-test/modules/mod_headers.so [Tue Aug 11 14:49:21.667195 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module setenvif_module from /usr/local/httpd-test/modules/mod_setenvif.so [Tue Aug 11 14:49:21.667298 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module version_module from /usr/local/httpd-test/modules/mod_version.so [Tue Aug 11 14:49:21.667395 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module unixd_module from /usr/local/httpd-test/modules/mod_unixd.so [Tue Aug 11 14:49:21.667484 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module status_module from /usr/local/httpd-test/modules/mod_status.so [Tue Aug 11 14:49:21.667588 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module autoindex_module from /usr/local/httpd-test/modules/mod_autoindex.so [Tue Aug 11 14:49:21.667680 2020] [so:debug] [pid 25863:tid 3082425792] mod_so.c(266): AH01575: loaded module dir_module from /usr/local/httpd-test/modules/mod_dir.so Speicherzugriffsfehler Kai Am 11.08.2020 um 14:05 schrieb Keith Roberts:

Hi Kai, Is it seg faulting when the mod_alias mod is loaded? Can you try to run apache and PHP module without the mod_alias module to see if it happens then? Kind Regards, Keith Roberts On 11/08/2020 11:21, Kai Fürstenberg wrote:

/usr/local/httpd-test/modules/mod_dir.so [Tue Aug 11 12:04:48.058215 2020] [so:debug] [pid 24664:tid 3083007424] mod_so.c(266): AH01575: loaded module alias_module from /usr/local/httpd-test/modules/mod_alias.so Speicherzugriffsfehler "Speicherzugrifftsfehler" = "Segmentation fault"