مشکل nginx در سرور خطای 502 bad gateway

لاگ php-fpm

کد:
 WARNING: [pool admin] child 23052 exited on signal 11 (SIGSEGV) after 13.778051 seconds from start
 NOTICE: [pool admin] child 23053 started
 WARNING: [pool admin] child 14689 exited on signal 11 (SIGSEGV) after 488.154411 seconds from start
 NOTICE: [pool admin] child 15403 started
 WARNING: [pool admin] server reached max_children setting (50), consider raising it
وب سرور nginx

فایل کانفیگ nginx

کد:
    fastcgi_buffers 8 16k;
    fastcgi_buffer_size 32k;
    fastcgi_connect_timeout 300;
    fastcgi_send_timeout 300;
    fastcgi_read_timeout 300;
php-fpm

کد:
listen = 127.0.0.1:9000