Well, actually you have to recompile the source-code and configure it with --with-debug AND enable the debug command behind error.log (see link [1] at the bottom of the mail).
Obviously this will log a huge amounts of data, so make sure you are filesystem can cope with the amount of data logged.
[1] http://nginx.org/en/docs/debugging_log.html
----------------------------------------
> From: info@pkern.at
> To: nginx@nginx.org
> Subject: AW: Webserver crashes sometimes - don't know why
> Date: Mon, 7 Jan 2013 10:18:26 +0100
>
> Hi Lukas,
>
> No, I currently have the latest development version from svn of 01.01.2013
> - 1.3.11. (Revision 5001).
> I only have one installed module: headers more
>
> Have I add "debug" behind error.log? I currently have it without debug and I
> don't see any information about the crash.
>
> Thanks for your help :)
>
> Greets,
> Patschi
>
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