bug#15025: emacs --daemon stuck in infinite loop

[Glenn Morris]

Dan Nicolaescu wrote:

> This seems to be reproducible. 
>
> emacs compiled with Lucid toolkit
>
> The recipe here uses Xnest because it easy to kill/restart, probably the same
> happens if the X session is killed.
>
> Xnest :1&
> xterm -display :1&
>
> Now type in the xterm above:
> emacs --daemon
>
> In a different xterm type:
> emacsclient -t Makefile 
> (or any file that exists).
> C-z
>
> now while emacsclient is suspended kill Xnest (using the window manager
> close button)
>
> Emacs daemon should still survive, but 
> emacsclient -t 
> cannot connect to it. 
>
> Looking in the debugger, emacs is stuck in an infinite loop in: 
>
> frame.c: next_frame
>
> while (passed < 2)
>
> passed never gets set to more than 1, so the loop never ends.
>
> What is the intention of that code? 

It seems this was introduced in
http://lists.gnu.org/archive/html/emacs-diffs/2012-12/msg00093.html

Dmitry, please could you take a look?