bug#16420: 24.3; Drawing an overlay causes 100% cpu utilization

[Eli Zaretskii]

> Date: Sun, 12 Jan 2014 20:04:22 +0400
> From: Dmitry Antipov <dmantipov@yandex.ru>
> Cc: 16420@debbugs.gnu.org
> 
> On 01/12/2014 02:01 AM, Lars Andersen wrote:
> 
> > Starting from emacs -Q:
> >
> > (defface flycheck-warning
> > '((((supports :underline (:style wave)))
> > :underline (:style wave :color "DarkOrange"))
> > (t
> > :underline t :inherit warning))
> > "Flycheck face for warnings."
> > :package-version '(flycheck . "0.13")
> > :group 'flycheck-faces)
> > (let ((ov (make-overlay (point) (point-at-eol)))
> > (face 'flycheck-warning))
> > (overlay-put ov 'face face)) ;; C-x C-e this last form to reproduce
> 
> Note that C-x C-e has no visible effect until you evaluate first
> 'defface' form too.

Dmitry, can you reproduce this?  Because I can't, neither in Emacs
24.3 nor in the latest trunk.  But that's on MS-Windows; I don't have
access to a GUI session on Unix.

Anyway, if Emacs infloops, please attach the debugger and try to find
out where it loops by using the advice in etc/DEBUG.