bug#16676: 24.3.50; Repeated but random hang

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: 16676@debbugs.gnu.org
> Date: Fri, 07 Feb 2014 17:08:00 -0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > My reading of this is: Emacs was at the end of a redisplay cycle, when
> > a call to an X function signaled an error because "Connection lost to
> > X server `:0'".  Then Emacs tried to delete the frame on that display,
> > which again involves calls to X.
> >
> > Do you know why the connection was lost in the first place?
> 
> As far as I can tell, no X connection was lost.

Xlib obviously thinks otherwise, the error message in the backtrace is
very clear.