bug#16473: 24.3.50; emacs_backtrace.txt

[Drew Adams]

What's more, I was editing a file (call it `foo.el') when Emacs crashed. And in 
the next Emacs session I see an automatically created file named `.#foo.el'.  
That file contains only this text, where USER is my user name and MACHINE is my 
machine name:

USER@MACHINE.1700:1389829856

Worse, the file I was editing has disappeared altogether - no autosave file.

I have never noticed this happen before.  Fortunately, the file I was editing 
was not very important.  I don't recall whether I had actually saved it prior 
to the crash.