На неизвестном пока коде зависает и падает так:

*** glibc has detected an error in /usr/sbin/httpd2: double free or corruption (fasttop): 0x09d43be0 ***
======= Backtrace: =========
/lib/libc.so.6(+0x6b9da)[0x17b9da]
/lib/libc.so.6(+0x6d313)[0x17d313]
/lib/libc.so.6(cfree+0x71)[0x180591]
/usr/lib/libphp-5.3.18.so.0(+0x25f924)[0x1202924]
/usr/lib/libphp-5.3.18.so.0(zend_error+0x652)[0x125fca2]
/usr/lib/libphp-5.3.18.so.0(zend_timeout+0x63)[0x124f9e3]
[0x4e5500]
/usr/lib/libphp-5.3.18.so.0(+0x25f924)[0x1202924]
/usr/lib/libphp-5.3.18.so.0(zend_error+0x652)[0x125fca2]
/usr/lib/libphp-5.3.18.so.0(+0x3447ee)[0x12e77ee]
/usr/lib/libphp-5.3.18.so.0(+0x345f40)[0x12e8f40]
/usr/lib/libphp-5.3.18.so.0(execute+0x1e4)[0x1287e94]
/usr/lib/php/5.3.18/extensions/suhosin.so(+0x12726)[0x642726]
/usr/lib/libphp-5.3.18.so.0(+0x30bd0f)[0x12aed0f]
/usr/lib/libphp-5.3.18.so.0(execute+0x1e4)[0x1287e94]
/usr/lib/php/5.3.18/extensions/suhosin.so(+0x12726)[0x642726]
/usr/lib/libphp-5.3.18.so.0(+0x30bd0f)[0x12aed0f]
/usr/lib/libphp-5.3.18.so.0(execute+0x1e4)[0x1287e94]
/usr/lib/php/5.3.18/extensions/suhosin.so(+0x12726)[0x642726]
/usr/lib/libphp-5.3.18.so.0(+0x30bd0f)[0x12aed0f]
/usr/lib/libphp-5.3.18.so.0(execute+0x1e4)[0x1287e94]
/usr/lib/php/5.3.18/extensions/suhosin.so(+0x12726)[0x642726]
/usr/lib/libphp-5.3.18.so.0(zend_execute_scripts+0x60)[0x1260c10]
/usr/lib/libphp-5.3.18.so.0(php_execute_script+0x1de)[0x120586e]
/usr/lib/apache2/modules/mod_php5.so(+0x3cc5)[0x66acc5]
/usr/sbin/httpd2(ap_run_handler+0x44)[0x807afb3]
/usr/sbin/httpd2(ap_invoke_handler+0x13e)[0x807b6de]
/usr/sbin/httpd2(ap_process_request+0x63)[0x808aec6]
/usr/sbin/httpd2[0x8087ee1]
/usr/sbin/httpd2(ap_run_process_connection+0x44)[0x8083817]
/usr/sbin/httpd2(ap_process_connection+0x58)[0x8083ca7]
/usr/sbin/httpd2[0x80917b2]
/usr/sbin/httpd2[0x8091b34]
/usr/sbin/httpd2[0x8091d86]
/usr/sbin/httpd2(ap_mpm_run+0x4d5)[0x80922a3]
/usr/sbin/httpd2(main+0xbc6)[0x80648a5]
/lib/libc.so.6(__libc_start_main+0xe6)[0x126c96]
/usr/sbin/httpd2[0x80632e1]

 rpm -q apache2-mod_php5
apache2-mod_php5-5.3.18.20121017-alt0.M60P.1