No gcroots?

I was pretty much wrong in my previous post, when said that if your object has no gcroots, you are probably experiencing a memory leak. My colleagues has corrected me at the meeting, so I decided to go through this theme once again.

And this is what I found:

If a lot of objects do not have gcroots, it just means that they possibly will be collected with next GC run. But! they may have unmanaged roots, and therefore will never be collected. Here is a cool article, explaining how this situation may happen: http://adavesh.blogspot.com/2012/02/memory-leaks-in-net-application-dont.html