Load the following demo on an iPhone 6: http://apps.playcanvas.com/will/cylinder/barrels After several seconds, the app should freeze and the tab will become unresponsive. The only option is to close the tab. (Note that there's no iOS 8.0 option for OS, so I've marked it iOS 7.0. Obviously, iPhone 6 only supports iOS 8.0+ anyway...
<rdar://problem/18854602>