bug#25391: 24.5; ffap-guesser "stack overflow in regexp matcher" error may crash emacs.

[Thierry Volpiatto]

Reproduce from emacs -Q:

1) require ffap.
2) Open a file of about 560k containing only one line, e.g
"~/emacs.d/elpa/archives/archive-contents"
3) M-: (ffap-guesser)

Debugger entered--Lisp error: (error "Variable binding depth exceeds 
max-specpdl-size")
  looking-at("^.*\\<\\(Type\\|Name\\|Path\\|Host\\|Port\\) *= *\\(.*\\) *$")
  ffap-gopher-at-point()
  ffap-guesser()
  eval((ffap-guesser) nil)
  eval-expression((ffap-guesser) nil)
  funcall-interactively(eval-expression (ffap-guesser) nil)
  call-interactively(eval-expression nil nil)
  command-execute(eval-expression)

This is reproductible from emacs-26 as well.



In GNU Emacs 24.5.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2016-11-09 on dell-14z
Windowing system distributor `The X.Org Foundation', version 11.0.11701000
System Description:     Linux Mint 17.3 Rosa

Configured using:
 `configure CFLAGS=-O3'

Important settings:
  value of $LC_MONETARY: fr_FR.UTF-8
  value of $LC_NUMERIC: fr_FR.UTF-8
  value of $LC_TIME: fr_FR.UTF-8
  value of $LANG: fr_FR.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  global-disable-mouse-mode: t
  global-git-gutter-mode: t
  eldoc-in-minibuffer-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  diff-auto-refine-mode: t
  magit-auto-revert-mode: t
  global-git-commit-mode: t
  psession-mode: t
  dired-async-mode: t
  display-time-mode: t
  winner-mode: t
  auto-image-file-mode: t
  savehist-mode: t
  show-paren-mode: t
  helm-descbinds-mode: t
  helm-top-poll-mode: t
  helm-push-mark-mode: t
  eldoc-mode: t
  helm-mode: t
  shell-dirtrack-mode: t
  helm-adaptive-mode: t
  helm-popup-tip-mode: t
  async-bytecomp-package-mode: t
  minibuffer-depth-indicate-mode: t
  override-global-mode: t
  tooltip-mode: t
  mouse-wheel-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
  transient-mark-mode: t

Recent messages:
uncompressing window.el.gz...done
Setting up indent for shell type bash
Indentation variables are now local.
Indentation setup for shell type bash
uncompressing reposition.el.gz...done
Restoring buffers...77%
Configuring package slime...done
Restoring buffers...82%
uncompressing imenu.el.gz...done
Restoring buffers...done

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Features:
(shadow epa-mail face-remap emacsbug helm-command js imenu
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cl-macs gv async-bytecomp advice async mb-depth edmacro kmacro
use-package diminish bind-key easy-mmode tex-site gh-common gh-profile
url-parse auth-source gnus-util mm-util help-fns mail-prsvr
password-cache url-vars rx s ucs-normalize marshal ht json dash eieio
byte-opt bytecomp byte-compile cl-extra cconv eieio-core slime-autoloads
info easymenu package epg-config time-date avoid cus-start cus-load
cl-loaddefs cl-lib tooltip electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment lisp-mode prog-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer 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 make-network-process dbusbind
gfilenotify dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
((conses 16 785234 224980)
 (symbols 48 66492 2)
 (miscs 40 369 2735)
 (strings 32 189134 114480)
 (string-bytes 1 5580098)
 (vectors 16 88824)
 (vector-slots 8 1295163 62942)
 (floats 8 2470 841)
 (intervals 56 2763 783)
 (buffers 960 162)
 (heap 1024 88807 14786))

-- 
Thierry