why to call php_output_activate(TSRMLS_C) from php_module_startup

Hi All, I could see php_output_activate(TSRMLS_C) getting called from php_module_startup immedeately after php_output_startup. Why is this needed? As each SAPI modules call php_output_activate(TSRMLS_C) explicitly as a part of request startup. Why am I concerned about this? Ans: php_output_activate(TSRMLS_C) sets OG(php_body_write) = php_ub_body_write; which causes calls to php_printf to use php_ub_body_write which depends on SG(request_info) which is null while php_printf is invoked as part of apache startup error(Like Invalid extension/ Non existent extension) logging. This causes segmentation fault. This change seems to have been introduced in version 1.371 of main/main.c by Zeev(3 years and 3 months ago). The comment says, Fix a major thread safety bug in the output mechanism @- Fixed a major memory corruption bug in the thread safe version (Zeev) Can I remove a call to php_output_activate(TSRMLS_C) from php_module_startup? PS:What is the use of display_startup_errors? What does display mean with respect to startup as it might not have any associated request context? With regards Kamesh Jayachandran