24.3; gnus-recursive-directory-files is fooled by upward symlinks

David Bremner david at tethera.net
Sun Jul 20 07:14:53 PDT 2014


Hi Emacs Maintainers;

A notmuch-emacs user reported a bug with emacs "hanging" on unpacking a
tar file.  After some debugging I believe have narrowed the problem down
to the following test case, which can be run with e.g.

% emacs -Q --script bug.el

(require 'gnus-util)

(let* ((temp-dir (make-temp-file "/tmp/loop-test" t))
       (dir (concat temp-dir "/test"))
       (target (concat dir "/parent")))
  (make-temp-file dir)
  (make-directory dir)
  (make-symbolic-link ".." target)
  (message "%s" (gnus-recursive-directory-files dir)))

On my system, this reports some 40 spurious paths created by following
the symlink.  In the actual case, it reported some 70,000 paths, which
caused further processing by the mm- libraries to grind to take an
apparently infinite time.

At a wild guess some error with max-lisp-eval-depth is stopping the
expansion, but is being hidden from the caller. At least in this case it
seems like it would be better to signal an error back to the caller.


In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2014-06-06 on barber, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:	Debian GNU/Linux testing (jessie)

Configured using:
 `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
 '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
 '--localstatedir=/var/lib' '--infodir=/usr/share/info'
 '--mandir=/usr/share/man' '--with-pop=yes'
 '--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes'
 '--with-x-toolkit=lucid' '--with-toolkit-scroll-bars' '--without-gconf'
 '--without-gsettings' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2
 -fstack-protector --param=ssp-buffer-size=4 -Wformat
 -Werror=format-security -Wall' 'LDFLAGS=-Wl,-z,relro'
 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
  value of $LANG: en_CA.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Apropos

Minor modes in effect:
  diff-auto-refine-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
) ) C-x C-s C-a <right> <right> v <backspace> C-x C-s 
<select-window> <down-mouse-1> <mouse-1> ) <backspace> 
<backspace> <backspace> <backspace> ) ) ) C-x C-s <return> 
<return> ( m e s s a g e SPC " d o n e " ) C-x C-s 
<select-window> <help-echo> <help-echo> C-a C-j C-k 
C-p C-p C-p C-e C-x C-s M-x e v a k SPC <backspace> 
l SPC c SPC SPC <return> <M-left> <M-left> <M-left> 
<M-left> <M-left> <M-left> <M-left> <M-right> <right> 
C-h f s t r i n g C-g M-x a p r o SPC <return> s t 
r i n g <return> <help-echo> <select-window> <down-mouse-1> 
<mouse-movement> <mouse-movement> <drag-mouse-1> C-v 
C-v C-v C-v C-v C-v C-v C-v C-s i n t e g C-SPC C-s 
f i r n <backspace> <backspace> <backspace> i <backspace> 
o r m a t C-s C-s C-s C-s C-s C-g C-x o C-x b * s c 
SPC <return> * p <backspace> <backspace> ( r <backspace> 
p r i n t <backspace> <tab> 1 <tab> SPC 1 ) C-j C-o 
C-o C-p C-p C-e C-b C-b C-b C-b C-f <backspace> t C-e 
C-j C-x b <return> <M-backspace> p r i n t SPC C-x 
C-s C-p C-p C-p C-a ; n M-x r e v e r <tab> t <tab> 
<return> y e s <return> ; C-x C-s \ <backspace> \ <backspace> 
<backspace> C-x C-s M-x r e p o r <tab> <return> g 
n u s - r e c u r i s i <backspace> <backspace> <backspace> 
s i v e - d i r e c t o r y - f o i <backspace> <backspace> 
i l e s <down-mouse-1> <mouse-1> M-x C-g <help-echo> 
<select-window> <down-mouse-1> <mouse-1> M-x r e c 
u <tab> <M-backspace> <M-backspace> r e p o r t <tab> 
<return>

Recent messages:
Saving file /home/bremner/bug.el...
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bug.el changed on disk; really edit the buffer? (y, n, r or C-h) n
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Making completion list...
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Saving file /home/bremner/bug.el...
Wrote /home/bremner/bug.el
byte-code: Command attempted to use minibuffer while in minibuffer
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/usr/share/emacs24/site-lisp/auctex/tex-mik hides /usr/share/emacs/site-lisp/auctex/tex-mik
/usr/share/emacs24/site-lisp/auctex/prv-emacs hides /usr/share/emacs/site-lisp/auctex/prv-emacs
/usr/share/emacs24/site-lisp/auctex/context hides /usr/share/emacs/site-lisp/auctex/context
/usr/share/emacs24/site-lisp/auctex/multi-prompt hides /usr/share/emacs/site-lisp/auctex/multi-prompt
/usr/share/emacs24/site-lisp/auctex/context-nl hides /usr/share/emacs/site-lisp/auctex/context-nl
/usr/share/emacs24/site-lisp/auctex/latex hides /usr/share/emacs/site-lisp/auctex/latex
/usr/share/emacs24/site-lisp/auctex/font-latex hides /usr/share/emacs/site-lisp/auctex/font-latex
/usr/share/emacs24/site-lisp/auctex/tex-fold hides /usr/share/emacs/site-lisp/auctex/tex-fold
/usr/share/emacs24/site-lisp/auctex/tex-bar hides /usr/share/emacs/site-lisp/auctex/tex-bar
/usr/share/emacs24/site-lisp/auctex/texmathp hides /usr/share/emacs/site-lisp/auctex/texmathp
/usr/share/emacs24/site-lisp/auctex/preview hides /usr/share/emacs/site-lisp/auctex/preview
/usr/share/emacs24/site-lisp/auctex/bib-cite hides /usr/share/emacs/site-lisp/auctex/bib-cite
/usr/share/emacs24/site-lisp/auctex/tex-jp hides /usr/share/emacs/site-lisp/auctex/tex-jp
/usr/share/emacs24/site-lisp/auctex/tex-font hides /usr/share/emacs/site-lisp/auctex/tex-font
/usr/share/emacs24/site-lisp/auctex/context-en hides /usr/share/emacs/site-lisp/auctex/context-en
/usr/share/emacs24/site-lisp/auctex/tex-info hides /usr/share/emacs/site-lisp/auctex/tex-info
/usr/share/emacs/24.3/lisp/emacs-lisp/cl-lib hides /usr/share/emacs/24.3/site-lisp/slime/lib/cl-lib
/usr/share/emacs/24.3/lisp/emacs-lisp/ert hides /usr/share/emacs/24.3/site-lisp/slime/lib/ert
/usr/share/emacs/24.3/lisp/emacs-lisp/ert-x hides /usr/share/emacs/24.3/site-lisp/slime/lib/ert-x

Features:
(shadow sort mail-extr emacsbug apropos misearch multi-isearch edebug
jka-compr debug latexenc mm-archive mule-util cus-start cus-load
company-autoloads finder-inf message-templ jss jss-debugger jss-console
jss-io jss-http-repl jss-io-pretty-printers jss-prompt jss-browser
jss-browser-firefox jss-browser-webkit json jss-remote-value jss-script
url url-proxy url-privacy url-expand url-methods url-history url-cookie
url-domsuf url-util jss-browser-api jss-super-mode derived jss-deferred
jss-utils websocket url-parse auth-source eieio url-vars bindat
circe-color-nicks circe-chanop circe byte-opt warnings lui-irc-colors
lcs lui-format lui tracking shorten flyspell ispell .loaddefs el-get
el-get-autoloads el-get-list-packages el-get-notify help-mode
el-get-dependencies el-get-build el-get-status pp el-get-recipes
el-get-byte-compile el-get-methods el-get-fossil el-get-svn
el-get-pacman el-get-github-zip el-get-github-tar el-get-http-zip
el-get-http-tar el-get-hg el-get-git-svn el-get-fink el-get-emacswiki
el-get-http el-get-emacsmirror el-get-github el-get-git el-get-elpa
package el-get-darcs el-get-cvs el-get-bzr el-get-brew el-get-builtin
el-get-apt-get el-get-custom el-get-core autoload bytecomp byte-compile
cconv dired js-comint indirect-region self-destruct tempo org-contacts
org-capture org-agenda gnus-art mm-uu mml2015 epg-config gnus-sum nnoo
gnus-group gnus-undo nnmail mail-source gnus-start gnus-spec gnus-int
gnus-range gnus-win gnus gnus-ems nnheader gnus-util org-notmuch
org-remember org-datetree 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
remember rx vc vc-dispatcher notmuch hl-line notmuch-version
notmuch-message notmuch-maildir-fcc notmuch-hello wid-edit notmuch-tree
notmuch-parser notmuch-show notmuch-print notmuch-crypto notmuch-mua
notmuch-address notmuch-wash diff-mode coolj notmuch-query goto-addr
icalendar diary-lib diary-loaddefs cal-menu calendar cal-loaddefs
notmuch-tag crm notmuch-lib message sendmail rfc822 mml mailabbrev
mail-utils gmm-utils mailheader mm-view mml-smime mml-sec smime
password-cache dig mm-decode mm-bodies mm-encode mailcap mail-parse
rfc2231 rfc2047 rfc2045 ietf-drums mm-util mail-prsvr debian-el
debian-el-loaddefs w3m-load slime-autoloads cl-macs gv pylint
org-install 50magit haskell-mode-autoloads edmacro kmacro geiser-install
geiser ido ess-toolbar ess-mouse mouseme thingatpt browse-url ess-menu
ess-swv ess-noweb ess-noweb-font-lock-mode ess-bugs-l essd-els ess-sas-d
ess-sas-l ess-sas-a shell pcomplete ess-sta-d ess-sta-l cc-vars cc-defs
make-regexp ess-sp6-d ess-sp3-d ess-julia ess-r-d compile ess-tracebug
format-spec ess-roxy advice cl cl-lib advice-preload hideshow ess-help
ess-developer ess-r-args eldoc help-fns ess-s-l ess ess-inf comint
ansi-color ring ess-mode ess-noweb-mode ess-utils ess-custom executable
easymenu ess-compat ess-site emacs-goodies-el emacs-goodies-custom
emacs-goodies-loaddefs easy-mmode dpkg-dev-el dpkg-dev-el-loaddefs
preview-latex tex-site auto-loads time-date tooltip 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 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 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 dynamic-setting font-render-setting
x-toolkit x multi-tty emacs)


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