Unable to create a core file for my crashed program

Question

I am using Ubuntu 12.04 LTS. I wrote a simple program as follows to create crash

// null.c
#include

int main()
{
   int *p = NULL;
   int k=*p;
          


        

Answer 1

My understanding is that using ulimit is not permanent, i.e. if you reboot then the limit goes back to 0. To have unlimited permanent, you need to change /etc/security/limits.conf. Similarly for core pattern etc, change /etc/sysctl.conf.