For example,

[code]
nginx/sbin/nginx -c /opt/nginx/nginx.conf
[/code]


is OK, because /opt/nginx/nginx.conf is an absolute path

However,

[code]
nginx/sbin/nginx -c nginx.conf
[/code]

will get segment fault

I debug the source code, the problem is located in the function "ngx_conf_full_name". Seems the cycle used in that function is not yet initialized when trying to get the full path.