A string that can’t be googled

I searched for:

why does lvsnap_lockfile still exist

today and got no results. Not a very difficult search string one would think. I had no quotes, no exceptions - nada! So now I’m posting it here, ‘cos I’m a loser, so that this will be the *only* result. Heck, I might even post the reason it still exists - if I ever find out…