TestNodeDDOSsol.sol

pragma solidity ^0.4.19;

// Note that anyone can stop this contract from running!
// Only owner can restart it :)
contract PubliclyStoppable {
    
    address public owner;
    bool public stopped;

    function PubliclyStoppable() public {
        owner = msg.sender;
        stopped = false;
    }
    
    modifier stopInEmergency { 
        require(!stopped);
        _;
    }
    
    modifier onlyInEmergency { 
        require(stopped);
        require(msg.sender == owner);
        _;
    }

    function stop() external stopInEmergency {
        stopped = true;
    }
    
    function start() external onlyInEmergency {
        stopped = false;
    }
}

contract TestNodeDDOS is PubliclyStoppable {
    
    function loop1() public stopInEmergency constant returns (uint256) {
        
        while (!stopped) {
            uint256 temp = 1;
        }
        
        return 1;
    }
    
}

https://rinkeby.etherscan.io/address/0x96c80720bb467b759d7b78a09b1f2579eafd2991#code