I wrote an example plugin:

public class TestPlugin extends JavaPlugin implements Listener {

    @Override
    public void onEnable() {
        Bukkit.getPluginManager().registerEvents(this, this);
    }

    @EventHandler
    public void onRedstone(BlockRedstoneEvent event) {
        event.setNewCurrent(0);
    }
}

With this plugin installed, placing a line of redstone and triggering it with a torch will cause a crash (https://bytebin.lucko.me/GNJxOgLCCQ).
In some cases, the server didn't crash but lagged a while and the torch and the block it was attached to were removed, but I wasn't able to properly reproduce that.