worker process exited on signal 11

Lintu nginx-forum at
Thu Apr 24 10:26:37 UTC 2014

Today is the third time within the last week that the nginx server crashed
down, causing the website to only return "502 Bad Gateway" errors. In the
error log, I can find the following line:

2014/04/24 05:11:53 [alert] 32094#0: worker process 32095 exited on signal

I have searched for other users having the same error message, but usually
it was caused by some custom plugin they installed. I don't use any plugins
(by that I mean I use debian's stable repository of the "nginx-full"
package. I'm not sure if they deliver some custom plugins by default).

What could be causing the issue for me?

#nginx -v
nginx version: nginx/1.2.1

#nginx -V
nginx version: nginx/1.2.1
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --conf-path=/etc/nginx/nginx.conf
--http-uwsgi-temp-path=/var/lib/nginx/uwsgi --lock-path=/var/lock/nginx.lock
--pid-path=/var/run/ --with-pcre-jit --with-debug
--with-http_addition_module --with-http_dav_module --with-http_geoip_module
--with-http_gzip_static_module --with-http_image_filter_module
--with-http_realip_module --with-http_stub_status_module
--with-http_ssl_module --with-http_sub_module --with-http_xslt_module
--with-ipv6 --with-sha1=/usr/include/openssl --with-md5=/usr/include/openssl
--with-mail --with-mail_ssl_module

#uname -a
Linux [hostname removed] 3.2.0-4-amd64 #1 SMP Debian 3.2.54-2 x86_64

user www-data;
worker_processes 8;
pid /var/run/;

events {
        worker_connections 16384;
        # multi_accept on;

worker_rlimit_nofile 32768;

http {

        # Basic Settings

        sendfile on;
        tcp_nopush on;
        tcp_nodelay on;
        keepalive_timeout 5;
        types_hash_max_size 2048;
        server_tokens off;

        server_names_hash_bucket_size 64;
        server_name_in_redirect off;

        include /etc/nginx/mime.types;
        default_type application/octet-stream;

        # Logging Settings

        access_log /var/log/nginx/access.log;
        error_log /var/log/nginx/error.log;

        # Gzip Settings

        gzip on;
        gzip_buffers 16 8k;
        gzip_comp_level 6;
        gzip_http_version 1.1;
        gzip_min_length 10;
        gzip_types text/plain text/css image/png image/gif image/jpeg
application/json application/x-javascript text/xml application/xml
application/xml+rss text/javascript image/x-icon;
        gzip_vary on;
        gzip_proxied any;
        gzip_disable "MSIE [1-6]\.(?!.*SV1)";

        # Proxy Settings

        proxy_send_timeout 90;
        proxy_read_timeout 90;
        proxy_buffer_size 4k;
        proxy_buffers 4 32k;
        proxy_busy_buffers_size 64k;
        proxy_temp_file_write_size 64k;

        include /etc/nginx/conf.d/*.conf; # there is no file in that dir
        include /etc/nginx/sites-enabled/*; # only some files with pretty
basic server{} blocks

Posted at Nginx Forum:,249524,249524#msg-249524

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