how to find a memory corruption in php ?

Hi all, I get an error with my program: Fatal error: Allowed memory size of 134217728 bytes exhausted at /home/courtois/php-5.3.6/Zend/zend_execute.h:163 (tried to allocate 261900 bytes) in /var/www/dev4.sociatomdev.com/chroot/htdocs/templeet/fetch.php on line 580 - The same error occurs with any of php 5.3 versions tested. With 5.2 it's ok. - I know the error message is wrong. The program does not consume much memory. - If i change some lines in my php code like adding trace messages it sometimes work sometimes no (but constant result for same php code) I will not submit the bug since it's hard to reproduce unless being in the exact same configuration as me. I used to be an experienced C programmer (>300000 lines written) but almost nothing for the last 15 years. My questions: - is there any document somewhere to read before hunting a bug in php ? - are there any build/compile options other than --enable-debug ? - how should I proceed to debug when php is called via fastcgi ? My configuration: debian squeeze i386 32bits Thanks, Pascal