Hi,
since update to mediawiki 1.22 I got many errors like this in my logs:
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/xmlreader.so' - /usr/lib64/php/modules/xmlreader.so: failed to map segment from shared object: Cannot allocate memory in Unknown on line 0 PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/xmlrpc.so' - /usr/lib64/php/modules/xmlrpc.so: failed to map segment from shared object: Cannot allocate memory in Unknown on line 0 PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/xmlwriter.so' - /usr/lib64/php/modules/xmlwriter.so: failed to map segment from shared object: Cannot allocate memory in Unknown on line 0 PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/xsl.so' - /usr/lib64/php/modules/xsl.so: failed to map segment from shared object: Cannot allocate memory in Unknown on line 0 PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/zip.so' - /usr/lib64/php/modules/zip.so: failed to map segment from shared object: Cannot allocate memory in Unknown on line 0 PHP Fatal error: Out of memory (allocated 262144) (tried to allocate 523800 bytes) in Unknown on line 0
after some googeling I found out that due to some changes in mediawiki, the default for $wgMaxShellMemory is too low, even the raised one from 1.22
raising $wgMaxShellMemory to 512000 solved the problem for me.
Sincerly, Klaus