id summary reporter owner description type status priority milestone component version resolution keywords cc uname nginx_version 1101 nginx does not respond to SIGHUP/SIGUSR2 tiandrey@… "We have nginx installed on frontend servers; the configuration is quite simple - nginx decrypts HTTPS traffic and proxies it to backend servers. The problem is that sometimes nginx stops responding to SIGHUP for configuration updates and to SIGUSR2 for binary updates, seems like it just ignores the signals and does nothing. Today I've even spotted some zombie nginx processes. I don't see any pattern in this behavior - out of our ten servers there may be two servers with correctly working nginx and eight servers with nginx that ignores signals, or vice versa, although hardware and software configuration of the servers is identical. Here is a little example of what I am talking about: {{{ root@server03 ~ # ps axjf | grep [n]ginx 1 2078 2078 2078 ? -1 Ss 0 0:03 nginx: master process /usr/sbin/nginx -g daemon on; master_process on; 2078 16829 2078 2078 ? -1 S 65534 1399:13 \_ nginx: worker process 2078 16830 2078 2078 ? -1 S 65534 1396:36 \_ nginx: worker process 2078 16831 2078 2078 ? -1 R 65534 1396:16 \_ nginx: worker process 2078 16832 2078 2078 ? -1 S 65534 1392:03 \_ nginx: worker process 2078 16833 2078 2078 ? -1 S 65534 1390:33 \_ nginx: worker process 2078 16834 2078 2078 ? -1 S 65534 1395:36 \_ nginx: worker process 2078 16835 2078 2078 ? -1 R 65534 1394:23 \_ nginx: worker process 2078 16836 2078 2078 ? -1 R 65534 1385:00 \_ nginx: worker process 2078 16837 2078 2078 ? -1 S 65534 1409:25 \_ nginx: worker process 2078 16839 2078 2078 ? -1 Z 65534 1296:41 \_ [nginx] 2078 16840 2078 2078 ? -1 S 65534 1399:22 \_ nginx: worker process 2078 16841 2078 2078 ? -1 Z 65534 1294:17 \_ [nginx] 2078 16842 2078 2078 ? -1 R 65534 1401:06 \_ nginx: worker process 2078 16843 2078 2078 ? -1 R 65534 1398:11 \_ nginx: worker process 2078 16844 2078 2078 ? -1 R 65534 1398:19 \_ nginx: worker process 2078 16845 2078 2078 ? -1 S 65534 4:22 \_ nginx: cache manager process 2078 54245 2078 2078 ? -1 R 65534 533:57 \_ nginx: worker process root@server03 ~ # cat /run/nginx.pid 2078 root@server03 ~ # kill -HUP $(cat /run/nginx.pid) root@server03 ~ # kill -USR2 $(cat /run/nginx.pid) root@server03 ~ # ps axjf | grep [n]ginx 1 2078 2078 2078 ? -1 Ss 0 0:03 nginx: master process /usr/sbin/nginx -g daemon on; master_process on; 2078 16829 2078 2078 ? -1 R 65534 1399:41 \_ nginx: worker process 2078 16830 2078 2078 ? -1 R 65534 1397:04 \_ nginx: worker process 2078 16831 2078 2078 ? -1 R 65534 1396:44 \_ nginx: worker process 2078 16832 2078 2078 ? -1 S 65534 1392:32 \_ nginx: worker process 2078 16833 2078 2078 ? -1 S 65534 1391:01 \_ nginx: worker process 2078 16834 2078 2078 ? -1 S 65534 1396:07 \_ nginx: worker process 2078 16835 2078 2078 ? -1 S 65534 1394:51 \_ nginx: worker process 2078 16836 2078 2078 ? -1 S 65534 1385:29 \_ nginx: worker process 2078 16837 2078 2078 ? -1 R 65534 1409:54 \_ nginx: worker process 2078 16839 2078 2078 ? -1 Z 65534 1296:41 \_ [nginx] 2078 16840 2078 2078 ? -1 S 65534 1399:51 \_ nginx: worker process 2078 16841 2078 2078 ? -1 Z 65534 1294:17 \_ [nginx] 2078 16842 2078 2078 ? -1 S 65534 1401:35 \_ nginx: worker process 2078 16843 2078 2078 ? -1 S 65534 1398:40 \_ nginx: worker process 2078 16844 2078 2078 ? -1 R 65534 1398:46 \_ nginx: worker process 2078 16845 2078 2078 ? -1 S 65534 4:22 \_ nginx: cache manager process 2078 54245 2078 2078 ? -1 S 65534 534:25 \_ nginx: worker process root@server03 ~ # nginx -t nginx: the configuration file /etc/nginx/nginx.conf syntax is ok nginx: configuration file /etc/nginx/nginx.conf test is successful }}} After restart nginx works fine for some amount of time, usually for several days." defect closed major nginx-core 1.10.x worksforme Linux server03 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt25-2+deb8u3 (2016-07-02) x86_64 GNU/Linux "nginx version: nginx/1.10.1 built by gcc 4.9.2 (Debian 4.9.2-10) built with OpenSSL 1.0.1k 8 Jan 2015 (running with OpenSSL 1.0.1t 3 May 2016) TLS SNI support enabled configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/run/nginx.pid --lock-path=/run/lock/nginx.lock --http-client-body-temp-path=/run/shm/body_temp --http-proxy-temp-path=/run/shm/proxy_temp --http-fastcgi-temp-path=/run/shm/fastcgi_temp --http-uwsgi-temp-path=/run/shm/uwsgi_temp --http-scgi-temp-path=/run/shm/scgi_temp --with-http_ssl_module --with-http_realip_module --with-http_sub_module --with-http_dav_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_stub_status_module --with-mail --with-http_v2_module --with-http_geoip_module --with-select_module --with-http_auth_request_module --with-poll_module --with-debug"