I found this strange little cross on pictures when I was doing some long exposure photography. I have had some experience with hot pixel in the past, but this thing seems completely new to me.
I'm talking about the little white cross on the picture. It acts totally like a hot pixel, but its form is quite interesting. I have got several of these across my photos/sensor, some brighter than the other.
I'm using the Canon EOS 600D (Rebel T3i in the USA). I have tried the hot pixel fix you can find on the internet on this, but the crosses won't disappear (but that doesn't mean everything, because there are more hot pixels that don't disappear).
Is this a hot pixel? And how do I fix it?