Got one big prob with diesel, which it will runaway, usually occurs when the engine is really worn out...
But i not sure this will happen to new modern diesel or not... Last time i read on other forum, there a guy with his common rail mitsubishi diesel runaway on highway... that a 1:18 compression engine if not mistaken

What causes runaway is for example, a failed turbo seal on the intake side cause the engine oil to leak ... therefore the oil get sucked into the engine via intake stream... Since diesel are heat ignited engine, therefore the oil get suck from the engine will continue to combust... continue to do so until the engine blow itself up because of lubrication starvation...