Re: Need help debugging Emacs: emacsclient will not draw its contents sometimes

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 8 Sep 2015 06:00:25 -0700
> From: Jon Dufresne <jon.dufresne@gmail.com>
> 
> I run Emacs using the Emacs daemon. I regularly connect to the daemon
> with emacsclient. Frequently, the client is started from an external
> program, such as during a mercurial commit. _Sometimes the emacsclient
> frame will not draw its contents_, leaving Emacs in a useless state.
> This only occurs after the Emacs daemon has been running for hours and
> has already successfully started many emacsclients. When this occurs,
> my window manager shows that the program is running and has drawn an
> outline of where Emacs should be, but there are no contents. After the
> first occurrence, all new emacsclients will suffer the same fate and
> will not draw their contents. To Emacs return to a useful state, I
> restart the Emacs daemon. This means I lose the open buffers of my
> currently running Emacs.
> 
> Unfortunately, as I can't reliably reproduce this on demand, it is
> difficult and time consuming to tests different versions of init.el.
> 
> Emacs version:
> GNU Emacs 24.5.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.16.2) of
> 2015-04-22 on buildhw-10.phx2.fedoraproject.org
> 
> I have attached a debugger to the running Emacs after this has
> occurred. I see the following backtrace below.

The backtrace shows that Emacs is idle, waiting for input, which is
normal.  Try typing "finish" repeatedly to step out of the functions
shown in the backtrace, until some of them doesn't return.  Then tell
here which one didn't.