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Add/uncomment to /etc/security/limits.conf

*       soft    core    unlimited

Add to /etc/sysctl.conf

kernel.core_pattern = /var/coredumps/core-%e-%s-%u-%g-%p-%t

Create /var/coredumps/

Run

sysctl -p
ulimit -c unlimited

Restart all needed services

For testing create file test.c

    int a (int *p) {
        int y = *p;
        return y;
}
 
int main (void) {
    int *p = 0; /* null pointer */
    return a (p);
}

Compile and run

gcc -o test test.c && ./test