core dumps

[Richard Kearsley]

Hi
I'm trying to get a core dump out of nginx but it isn't working...

I have done the following:

Made directory with permissions:
drwxr-xr-x  2 root    root    4.0K 2011-05-26 00:32 nginx-core

changed config:
worker_rlimit_core  512M;
working_directory  /home/dcstaff/nginx-core/;

but no dump is made when it crashes:
2011/05/26 06:46:50 [alert] 20526#0: worker process 20547 exited on signal 11

Is there any other trick to it?