worker process exited on signal 11

[Maxim Dounin]

Hello!

On Thu, Apr 24, 2014 at 06:26:37AM -0400, Lintu wrote:

> 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
> 11
> 
> 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).

As per "nginx -V" provided, there are at least 4 3rd party modules 
compiled in:

> --add-module=/tmp/buildd/nginx-1.2.1/debian/modules/nginx-auth-pam
> --add-module=/tmp/buildd/nginx-1.2.1/debian/modules/nginx-echo
> --add-module=/tmp/buildd/nginx-1.2.1/debian/modules/nginx-upstream-fair
> --add-module=/tmp/buildd/nginx-1.2.1/debian/modules/nginx-dav-ext-module

Besides that, you are using 1.2.1 which is a long obsolete version 
from a legacy 1.2.x branch.  It is recommended to upgrade at least 
to latest stable release, see http://nginx.org/en/download.html.

-- 
Maxim Dounin
http://nginx.org/