bug#24315: 25.1.50; re-search-forward errors with "Variable binding depth exceeds max-specpdl-size"

[Peder O. Klingenberg]

I recently started using gnus-icalendar to handle meeting invitations.
Someone sent me an invitation that included a rather long email thread
in typical outlook style, and gnus errored out when trying to display
the article.

The backtrace showed that the error comes from the call
  (re-search-forward  "\\(.*\\)\\(\r?\n[ \t].*\\)*" nil t)
in icalendar--read-element (nil nil).

I reduced and anonymized the contents of the message, the problematic
section is attached to this bug report.  The problem is reproducible for
me from emacs -Q by the following recipe:

  C-x C-f calendar-event-problem.txt
  <make sure cursor is somewhere in the first couple of lines>
  M-: (re-search-forward  "\\(.*\\)\\(\r?\n[ \t].*\\)*" nil t)

Result:
Debugger entered--Lisp error: (error "Variable binding depth exceeds 
max-specpdl-size")
  re-search-forward("\\(.*\\)\\(?\n[    ].*\\)*" nil t)
  eval((re-search-forward "\\(.*\\)\\(?\n[      ].*\\)*" nil t) nil)
  eval-expression((re-search-forward "\\(.*\\)\\(?\n[   ].*\\)*" nil t) nil)
  funcall-interactively(eval-expression (re-search-forward "\\(.*\\)\\(?\n[     
].*\\)*" nil t) nil)
  call-interactively(eval-expression nil nil)
  command-execute(eval-expression)

Reducing the text size by about 1/3, or just moving the cursor a ways
down the buffer before evaling, eliminates the error.

>From the same emacs -Q session:

max-specpdl-size is a variable defined in ‘C source code’.
Its value is 2930
Original value was 1300

Increasing max-specpdl-size to 20000 does not help, the problem still
occurs.

Strangely, the same recipe does not reproduce the error on os x, with a
build from master from 2016-08-12, but on my GNU/Linux machine, which is
where I run gnus and need this to work, it is 100% reproducible.  I am
on Kubuntu 14.04.5, emacs is compiled with gcc (Ubuntu
4.8.4-2ubuntu1~14.04.3) 4.8.4.

Is this reproducible for anyone else, or do I need to dig deeper into my
environment?  Any ideas on where to start digging?



In GNU Emacs 25.1.50.2 (x86_64-unknown-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2016-08-11 built on luna
Repository revision: 36a57c55f2b855bca704c26bf7d787b7b471fe16
Windowing system distributor 'The X.Org Foundation', version 11.0.11604000
System Description:     Ubuntu 14.04.5 LTS

Recent messages:
scroll-down-command: Beginning of buffer [3 times]
(Shell command succeeded with no output) [91 times]
Back to top level
When done with this frame, type C-x 5 0
Undo! [3 times]
calendar-event-problem.txt changed on disk; really edit the buffer? (y, n, r or 
C-h) r
ask-user-about-supersession-threat: File reverted: 
/home/pok/tmp/calendar-event-problem.txt
previous-line: Beginning of buffer [3 times]
Entering debugger...
Back to top level

Configured using:
 'configure --prefix=/usr/local/emacs-git
 
--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/site-lisp/:/usr/share/emacs/site-lisp
 --with-x=yes --with-x-toolkit=lucid --with-toolkit-scroll-bars
 --with-pop=yes'

Configured features:
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GSETTINGS NOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT
ZLIB TOOLKIT_SCROLL_BARS LUCID X11

Important settings:
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csv-mode magit-blame magit-stash magit-bisect magit-remote magit-commit
magit-sequence magit magit-apply magit-wip magit-log magit-diff
smerge-mode magit-core magit-autorevert autorevert filenotify
magit-process magit-popup magit-mode magit-git magit-section magit-utils
git-commit log-edit pcvs-util with-editor async-bytecomp async tramp-sh
tramp tramp-compat tramp-loaddefs trampver ucs-normalize shell dash
eieio-opt speedbar sb-image ezimage dframe cal-china lunar solar cal-dst
cal-bahai cal-islam cal-hebrew holidays hol-loaddefs cal-iso bookmark pp
tabify org-rmail org-mhe org-irc org-info org-gnus org-docview doc-view
jka-compr image-mode org-bbdb org-w3m org-table org-archive org-clock
org-indent ob-ditaa ob-plantuml org-bibtex org-element avl-tree bibtex
org-colview org-crypt org-habit org-agenda help-fns radix-tree misearch
multi-isearch thingatpt debbugs-gnu add-log debbugs soap-client warnings
rng-xsd rng-dt rng-util xsd-regexp debug cus-start cus-load mailalias
bbdb-message footnote ecomplete flow-fill vc-git diff-mode sort
gnus-cite shr-color color shr svg dom browse-url mail-extr gnus-async
gnus-bcklg qp gnus-ml disp-table gnus-topic mm-archive url-http url-gw
url-cache url-auth pop3 nnrss xml mm-url url url-proxy url-privacy
url-expand url-methods url-history url-cookie url-domsuf url-util
nndraft nnmh nnml utf-7 bbdb-gnus epa-file network-stream nsm starttls
gnus-agent gnus-srvr gnus-score score-mode nnvirtual gnus-msg nntp
gnus-cache pok-gnus gnus-icalendar org-capture gnus-art mm-uu mml2015
mm-view mml-smime smime dig mailcap icalendar diary-lib diary-loaddefs
nnir gnus-sum gnus-group gnus-undo bbdb-mua bbdb-com crm bbdb bbdb-site
timezone gnus-start gnus-cloud nnimap nnmail mail-source tls gnutls utf7
netrc nnoo parse-time gnus-spec gnus-int gnus-range message sendmail
puny dired dired-loaddefs rfc822 mml mml-sec epa derived epg mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
gnus-win gnus nnheader subr-x gnus-util rmail rmail-loaddefs rfc2047
rfc2045 ietf-drums mail-utils wid-edit linum paren paredit pok-init
bugz-mode yasnippet org advice org-macro org-footnote org-pcomplete
pcomplete org-list org-faces org-entities time-date 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 format-spec find-func cal-menu calendar cal-loaddefs gedcom
slime-autoloads reftex reftex-loaddefs reftex-vars edmacro kmacro ido
server filladapt dmacro mm-util mail-prsvr cl compile comint ansi-color
ring finder-inf tex-site info package epg-config url-handlers url-parse
auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs
password-cache url-vars seq byte-opt gv bytecomp byte-compile cl-extra
help-mode easymenu cconv cl-loaddefs pcase cl-lib emacs-goodies-el
emacs-goodies-custom emacs-goodies-loaddefs easy-mmode mule-util tooltip
eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
term/x-win 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 term/tty-colors 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 obarray 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 dbusbind inotify
dynamic-setting system-font-setting font-render-setting x-toolkit x
multi-tty make-network-process emacs)

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calendar-event-problem.txt
Description: Binary data