Hello!

On Thu, May 19, 2016 at 01:03:14PM +0800, 洪志道 wrote:

> Hi,
>
> It seems the following configure will cause core dump file.
>
> map $uri $s {
> default $s; # same var name as the var generated by map directive
> above
> }
>
> server {
> listen 80;
>
> location / {
> return 200 $s;
> }
> }

This is a classical example of infinite recursion. It's expected
to work fine on any host with infinite amount of memory, but
you've probably tried it on a host with some limited amount of
memory available. Avoid writing such configurations on hosts with
limited amount of memory.

Jokes aside, the result is expected. We've considered adding a
protection from such types of recursion (much like what we do with
subrequests and internal redirections), but yet think it would be
an overkill.

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

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