bug#22739: 25.0.50; Hangs on revertig buffer

[Óscar Fuentes]

While executing revert-buffer on a file, Emacs hanged using 100% CPU.
I've executed this operation thousands of times on this file on the past
without problem. The file contains pure ASCII text.

I was unable to reproduce the bug on a fresh session.

Full backtrace attached.

gdb.txt
Description: Text document

In GNU Emacs 25.0.50.29 (x86_64-unknown-linux-gnu, X toolkit)
 of 2016-01-21 built on qcore
Repository revision: 5293d1bdb3e665a565af032a163004c976328cc2
Windowing system distributor 'The X.Org Foundation', version 11.0.11702000
System Description:     Ubuntu 15.10

Configured using:
 'configure --without-toolkit-scroll-bars --with-x-toolkit=lucid'

Configured features:
XAW3D XPM JPEG TIFF GIF PNG SOUND GSETTINGS NOTIFY GNUTLS LIBXML2
FREETYPE XFT ZLIB LUCID X11

Important settings:
  value of $LANG: es_ES.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Outline

Minor modes in effect:
  TeX-PDF-mode: t
  show-paren-mode: t
  diff-auto-refine-mode: t
  global-git-commit-mode: t
  shell-dirtrack-mode: t
  ido-grid-mode: t
  flx-ido-mode: t
  ido-hacks-mode: t
  ido-everywhere: t
  buffer-flip-mode: t
  evil-leader-mode: t
  evil-mode: t
  evil-local-mode: t
  global-anzu-mode: t
  anzu-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  auto-fill-function: do-auto-fill

Recent messages:
Loading /home/oscar/elisp/ofv-lp0.el (source)...done
Loading /home/oscar/.emacs.d/elpa/auctex-11.89/preview.el (source)...done
Estableciendo variables para AucTex
Loading /home/oscar/elisp/ofv-wordnet.el (source)...done
Loading /home/oscar/elisp/tkidb.el (source)...done
Loading /home/oscar/elisp/ofv-org.el (source)...done
Loading /home/oscar/elisp/ofv-issues.el (source)...done
Loading /home/oscar/elisp/emacs.el (source)...done
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Features:
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lisp-mnt compile paren paredit-menu yasnippet psvn wid-edit pp elp
ediff-merg ediff-wind ediff-diff ediff-mult ediff-help ediff-init
ediff-util vc-git org-magit org-element avl-tree rx org org-macro
org-footnote org-pcomplete org-list org-faces org-entities noutline
outline org-version ob-emacs-lisp ob ob-tangle ob-ref ob-lob ob-table
ob-exp org-src ob-keys ob-comint ob-core ob-eval org-compat org-macs
org-loaddefs find-func cal-menu calendar cal-loaddefs magit-blame
magit-stash magit-bisect magit-remote magit-commit magit-sequence magit
magit-apply magit-wip magit-log magit-diff smerge-mode diff-mode
magit-core magit-autorevert autorevert filenotify magit-process
magit-popup magit-mode magit-git crm magit-section magit-utils
git-commit log-edit message dired rfc822 mml mml-sec epg mm-decode
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mailabbrev mail-utils gmm-utils mailheader pcvs-util add-log with-editor
tramp-sh tramp tramp-compat tramp-loaddefs trampver ucs-normalize shell
pcomplete comint ansi-color format-spec server column-overflow
flx-isearch ido-grid-mode flx-ido flx ido-hacks ido seq buffer-flip
key-chord evil-leader evil-paredit paredit evil-anzu evil
evil-integration evil-maps evil-commands ffap url-parse auth-source
eieio byte-opt bytecomp byte-compile cl-extra cconv eieio-core gnus-util
mm-util help-fns help-mode mail-prsvr password-cache url-vars
evil-command-window derived evil-types evil-search evil-ex evil-macros
evil-repeat evil-states evil-core evil-common windmove rect
evil-digraphs evil-vars goto-chg edmacro kmacro avy ring ws-butler
diminish cl anzu cl-seq easy-mmode cl-macs thingatpt cl-loaddefs pcase
cl-lib avoid solarized-light-theme solarized-dark-theme solarized dash
gv finder-inf tex-site info package easymenu epg-config advice time-date
mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel x-win term/common-win x-dnd tool-bar dnd fontset
image regexp-opt fringe tabulated-list newcomment elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cl-generic cham
georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese charscript case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer cl-preloaded nadvice
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote inotify dynamic-setting
system-font-setting font-render-setting x-toolkit x multi-tty
make-network-process emacs)