id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
1153	Nginx reload hang	avkarenow@…		"Hello,

I found a bug with fast and frequent reloading server. Tested on FreeBSD 10.3 and 9.3 with nginx 1.10.1 and 1.10.2.

How to reproduce:
# while true; do service nginx reload; done
Performing sanity check on nginx configuration:
nginx: the configuration file /usr/local/etc/nginx/nginx.conf syntax is ok
nginx: configuration file /usr/local/etc/nginx/nginx.conf test is successful
Performing sanity check on nginx configuration:
nginx: the configuration file /usr/local/etc/nginx/nginx.conf syntax is ok
nginx: configuration file /usr/local/etc/nginx/nginx.conf test is successful
Performing sanity check on nginx configuration:
nginx: the configuration file /usr/local/etc/nginx/nginx.conf syntax is ok
nginx: configuration file /usr/local/etc/nginx/nginx.conf test is successful
Performing sanity check on nginx configuration:
nginx: the configuration file /usr/local/etc/nginx/nginx.conf syntax is ok
nginx: configuration file /usr/local/etc/nginx/nginx.conf test is successful
(...)

The number of processes increases to 1024, like that:
  PID TT  STAT    TIME COMMAND
10688 ??  Z    0:00.00 <defunct>
10702 ??  Z    0:00.00 <defunct>
10751 ??  Z    0:00.00 <defunct>
10800 ??  Z    0:00.00 <defunct>
10848 ??  Z    0:00.00 <defunct>
10890 ??  Z    0:00.00 <defunct>
10938 ??  Z    0:00.00 <defunct>
10986 ??  Z    0:00.00 <defunct>
11030 ??  Z    0:00.00 <defunct>
11075 ??  Z    0:00.00 <defunct>
11119 ??  Z    0:00.00 <defunct>
11166 ??  Z    0:00.00 <defunct>
11210 ??  Z    0:00.01 <defunct>
11257 ??  Z    0:00.00 <defunct>
11303 ??  Z    0:00.00 <defunct>
11350 ??  Z    0:00.00 <defunct>
11399 ??  Z    0:00.00 <defunct>
11449 ??  Z    0:00.00 <defunct>
11494 ??  Z    0:00.00 <defunct>
11539 ??  Z    0:00.00 <defunct>
11587 ??  Z    0:00.00 <defunct>
11634 ??  Z    0:00.00 <defunct>
11682 ??  Z    0:00.00 <defunct>
11726 ??  Z    0:00.00 <defunct>
11774 ??  Z    0:00.00 <defunct>
11819 ??  Z    0:00.00 <defunct>
11867 ??  Z    0:00.00 <defunct>
11916 ??  Z    0:00.00 <defunct>
11963 ??  Z    0:00.00 <defunct>
12012 ??  Z    0:00.00 <defunct>
12072 ??  Z    0:00.00 <defunct>
12118 ??  Z    0:00.00 <defunct>
12163 ??  Z    0:00.00 <defunct>
12214 ??  Z    0:00.00 <defunct>
12266 ??  Z    0:00.00 <defunct>
12318 ??  Z    0:00.00 <defunct>
12365 ??  Z    0:00.00 <defunct>
12416 ??  Z    0:00.00 <defunct>
12463 ??  Z    0:00.00 <defunct>
12515 ??  Z    0:00.00 <defunct>
12565 ??  Z    0:00.00 <defunct>
12611 ??  Z    0:00.00 <defunct>
12660 ??  Z    0:00.00 <defunct>
12704 ??  Z    0:00.00 <defunct>
12750 ??  Z    0:00.00 <defunct>
12800 ??  Z    0:00.00 <defunct>
12844 ??  Z    0:00.00 <defunct>
12894 ??  Z    0:00.00 <defunct>
12943 ??  Z    0:00.00 <defunct>
12992 ??  Z    0:00.00 <defunct>
13034 ??  Z    0:00.00 <defunct>
13083 ??  Z    0:00.00 <defunct>
13126 ??  Z    0:00.00 <defunct>
13170 ??  Z    0:00.00 <defunct>
13220 ??  S    0:00.00 nginx: worker process (nginx)
13261 ??  S    0:00.00 nginx: worker process (nginx)

When it exceed 1024 in nginx error log:
2016/12/11 13:35:07 [alert] 17134#100094: no more than 1024 processes can be spawned
2016/12/11 13:35:07 [alert] 17134#100094: no more than 1024 processes can be spawned
2016/12/11 13:35:07 [alert] 17134#100094: no more than 1024 processes can be spawned

And now nginx hangs - when I stop reloading - processes for user www are normal but nginx not reponse untill restart."	defect	closed	major		nginx-core	1.10.x	wontfix			FreeBSD fbsd 9.3-RELEASE FreeBSD 9.3-RELEASE #0 r268512: Thu Jul 10 23:44:39 UTC 2014     root@snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64	"nginx version: nginx/1.10.2
built with OpenSSL 1.0.2j  26 Sep 2016
TLS SNI support enabled
configure arguments: --prefix=/usr/local/etc/nginx --with-cc-opt='-I /usr/local/include' --with-ld-opt='-L /usr/local/lib' --conf-path=/usr/local/etc/nginx/nginx.conf --sbin-path=/usr/local/sbin/nginx --pid-path=/var/run/nginx.pid --error-log-path=/var/log/nginx/error.log --user=www --group=www --modules-path=/usr/local/libexec/nginx --with-file-aio --with-ipv6 --http-client-body-temp-path=/var/tmp/nginx/client_body_temp --http-fastcgi-temp-path=/var/tmp/nginx/fastcgi_temp --http-proxy-temp-path=/var/tmp/nginx/proxy_temp --http-scgi-temp-path=/var/tmp/nginx/scgi_temp --http-uwsgi-temp-path=/var/tmp/nginx/uwsgi_temp --http-log-path=/var/log/nginx/access.log --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gzip_static_module --with-http_gunzip_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_stub_status_module --with-http_sub_module --with-pcre --with-http_v2_module --with-stream=dynamic --with-stream_ssl_module --with-threads --with-mail=dynamic --without-mail_imap_module --without-mail_pop3_module --without-mail_smtp_module --with-mail_ssl_module --with-http_ssl_module"