Since some not long time ping stopped working as non-root (I'm not sure if it distro-wide or maybe it is my custom kernel). The ping is fixed by this command:
sysctl -w net.ipv4.ping_group_range="0 1000"
But the problem is I cannot add it to /etc/sysctl.conf because it looks like it is overriden in boot later. If someone fixed the same problem please share your knowledge.
