Killing a frame sometimes kills emacs

[Tassilo Horn]

Hi all,

since lately, I have a really annoying problem with the current emacs
trunk.  My current emacs is about 4 days old, but I've hit that problem
already when I came back from holiday three weeks ago.

The problem is that frequently, killing an emacs X11 frame kills the
complete emacs instance.  It doesn't crash or so, but it's just like if
I had called `kill-emacs'.

The usual steps are:

  1. Start emacs (the server is activated from my .emacs)
  2. Work for several hours without issues
  3. emacsclient -c [maybe-a-file.txt]
  4. kill the client frame with C-x 5 0, C-x #, or the X knob at the
     window decoration ==> BANG! Emacs is gone...

My problem is that I'm totally unable to reproduce the issue.  I've just
tried to activate and use all packages/modes I usually work with (Gnus,
Org, SLIME/Clojure, Elisp, AUCTeX, rcirc) step by step, but still
creating and killing frames works as it's supposed to do.

Do you have any suggestions on how to debug this issue?

Bye,
Tassilo