On Tue, Feb 27, 2007 at 12:21:08AM +0900, Jan Svitok wrote:
> I suppose that linux makes core dumps unless it is told not to do
> (using ulimit). 

Or the process is setuid, unless you enable dumping of setuid processes with
sysctl. By default:

kernel.suid_dumpable = 0

Note that many Linux systems have the core size ulimit set to 0 by default.
I get

$ ulimit -a | grep core
core file size          (blocks, -c) 0

on both Ubuntu 6.06 and CentOS 4.4.

Regards,

Brian.