#40414 [Opn->Asn]: endless fork() loop when running fastcgi

ID: 40414 Updated by: tony2001@php.net Reported By: michiel at boland dot org -Status: Open +Status: Assigned Bug Type: CGI related Operating System: Solaris PHP Version: 5.2.0 -Assigned To: +Assigned To: dmitry Previous Comments: ------------------------------------------------------------------------ [2007-02-09 10:09:13] michiel at boland dot org Description: ------------ PHP running as fastcgi under apache2, with PHP_FCGI_CHILDREN set to 2. Under certain circumstances, the parent PHP process keeps forking off child processes that exit immediately. This goes on forever, until the parent is killed. When I run a debugger, the in_shutdown variable (in sapi/cgi/fastcgi.c) is set to 1. This causes fcgi_accept_request, which is called in child processes, to return immediately. The only place where in_shutdown can be set is in the SIGTERM signal handler, fcgi_signal_handler. The fcgi_signal_handler is installed in fcgi_init, which is called via fcgi_is_fastcgi, right after entry into main(). Later on in cgi_main.c, a new SIGTERM handler is installed. (line 1334) If a SIGTERM signal arrives in the window of time between fcgi_init and the setting of the new signal handler, the loop describe above will occur. As a fix I would suggest blocking SIGTERM in main() until after the new handler is in place. Reproduce code: --------------- n/a ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=40414&edit=1