GNU bug report logs - #20825
25.0.50; Cannot view info docs anymore (100% CPU)

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Tassilo Horn <tsdh <at> gnu.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.50; Cannot view info docs anymore (100% CPU)
Date: Tue, 16 Jun 2015 09:06:55 +0200

With emacs HEAD e80225000dda3f1deac5ea95a9253301b05fbed7, emacs starts
using up 100% CPU time when trying to view some info documentation.

  1. emacs -Q
  2. C-h i
     The info index is shown properly
  3. m emacs RET

Now emacs starts using up 100% CPU, and the emacs info docs aren't
shown.  With `debug-on-quit' I obtain the following backtrace during the
hang.

Debugger entered--Lisp error: (quit)
  count-lines(1 1)
  line-number-at-pos(70)
  filepos-to-bufferpos(1116 approximate)
  Info-find-node-2("/home/horn/Repos/el/emacs/info/emacs" "Top" nil nil)
  Info-find-node("emacs" "Top" nil nil)
  Info-goto-node("(emacs)" nil)
  Info-menu("Emacs" nil)
  funcall-interactively(Info-menu "Emacs" nil)
  call-interactively(Info-menu nil nil)
  command-execute(Info-menu)



In GNU Emacs 25.0.50.6 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.4)
 of 2015-06-16 on thinkpad-t440p
Repository revision: e80225000dda3f1deac5ea95a9253301b05fbed7
Windowing system distributor `The X.Org Foundation', version 11.0.11701000
System Description:	Arch Linux

Configured using:
 `configure 'CFLAGS=-g -ggdb3 -O1 -DTRACE_SELECTION''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3

Important settings:
  value of $LC_MONETARY: de_DE.utf8
  value of $LC_NUMERIC: de_DE.utf8
  value of $LC_TIME: de_DE.utf8
  value of $LANG: en_US.utf8
  locale-coding-system: utf-8-unix

Major mode: Group

Minor modes in effect:
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  hl-line-mode: t
  gnus-topic-mode: t
  global-company-mode: t
  global-aggressive-indent-mode: t
  gnus-undo-mode: t
  global-edit-server-edit-mode: t
  pdf-occur-global-minor-mode: t
  recentf-mode: t
  shell-dirtrack-mode: t
  async-bytecomp-package-mode: t
  global-subword-mode: t
  subword-mode: t
  savehist-mode: t
  show-paren-mode: t
  ivy-mode: t
  minibuffer-depth-indicate-mode: t
  electric-pair-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-quote-mode: t
  electric-indent-mode: t
  mouse-wheel-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
  column-number-mode: t
  line-number-mode: t

Recent messages:
20150616T090213.722> End of message
20150616T090233.529> Exiting summary buffer and applying spam rules
20150616T090233.921> Expiring articles...
20150616T090234.372> Expiring articles...done
20150616T090237.433> Saving Gnus registry (9291 entries) to ~/.gnus.d/.gnus.registry.eieio...
20150616T090237.617> Saving Gnus registry (size 9291) to ~/.gnus.d/.gnus.registry.eieio...done
20150616T090237.617> Saving /home/horn/.gnus.d/.newsrc.eld...
Saving file /home/horn/.gnus.d/.newsrc.eld...
Wrote /home/horn/.gnus.d/.newsrc.eld
20150616T090237.636> Saving /home/horn/.gnus.d/.newsrc.eld...done

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Features:
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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 cider-test
cider-stacktrace cider-client nrepl-client queue cider-util ewoc etags
xref clojure-mode paredit aggressive-indent epa-file epa epg rdictcc
google-contacts-message google-contacts derived url-cache google-oauth
google-contacts-gnus gnus-art mm-uu mml2015 mm-view mml-smime smime dig
gnus-sum gnus-group gnus-undo gnus-start gnus-cloud nnimap nnmail
mail-source tls utf7 netrc nnoo parse-time gnus-spec gnus-int gnus-range
gnus-win gnus gnus-ems gnus-compat nnheader em-term term ehelp esh-opt
esh-ext esh-util highlight-symbol boxquote rect ecomplete message rfc822
mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047
rfc2045 ietf-drums mailabbrev mail-utils gmm-utils mailheader
edit-server server yasnippet help-mode disp-table noutline outline
pdf-occur tablist tablist-filter semantic/wisent/comp semantic/wisent
semantic/wisent/wisent semantic/util-modes semantic/util semantic
semantic/tag semantic/lex semantic/fw mode-local cedet pdf-isearch
let-alist pdf-misc imenu pdf-tools cus-edit cus-start cus-load pdf-view
jka-compr pdf-cache pdf-info tq pdf-util image-mode browse-kill-ring
recentf tree-widget wid-edit helm-projectile helm-files image-dired
tramp tramp-compat tramp-loaddefs trampver shell pcomplete format-spec
dired-x dired-aux ffap helm-tags helm-bookmark helm-adaptive helm-info
bookmark pp helm-external helm-net browse-url xml url url-proxy
url-privacy url-expand url-methods url-history url-cookie url-domsuf
url-util url-parse auth-source gnus-util mm-util help-fns mail-prsvr
password-cache url-vars mailcap helm-buffers helm-match-plugin helm-help
helm-grep helm-regexp helm-plugin grep helm-elscreen helm-utils dired
compile comint ansi-color helm-locate helm helm-source eieio-compat
eieio byte-opt bytecomp byte-compile cl-extra seq cconv eieio-core
projectile ibuf-ext ibuffer dash thingatpt helm-config helm-easymenu
async-bytecomp async helm-aliases highlight-parentheses cl iedit
iedit-lib counsel swiper cap-words superword subword saveplace savehist
paren ivy delsel icomplete mb-depth ace-window easy-mmode cl-macs gv
ring avy smart-mode-line-respectful-theme smart-mode-line-light-theme
cl-seq smart-mode-line rich-minority rx bs elec-pair edmacro kmacro
cl-loaddefs cl-lib gnus-load subr-x pcase tsdh-light-theme finder-inf
info easymenu memory-usage-autoloads advice package epg-config 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 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 dbusbind gfilenotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 717432 77152)
 (symbols 48 60051 1)
 (miscs 40 356 772)
 (strings 32 183468 47947)
 (string-bytes 1 6481645)
 (vectors 16 64838)
 (vector-slots 8 1810483 194291)
 (floats 8 980 1033)
 (intervals 56 18763 2390)
 (buffers 976 39)
 (heap 1024 111236 37345))

Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#20825: 25.0.50; Cannot view info docs anymore (100% CPU)
Date: Tue, 16 Jun 2015 14:18:33 +0200

Tassilo Horn <tsdh <at> gnu.org> writes:

> With emacs HEAD e80225000dda3f1deac5ea95a9253301b05fbed7, emacs starts
> using up 100% CPU time when trying to view some info documentation.
>
>   1. emacs -Q
>   2. C-h i
>      The info index is shown properly
>   3. m emacs RET
>

I see this as well.

> Now emacs starts using up 100% CPU, and the emacs info docs aren't
> shown.  With `debug-on-quit' I obtain the following backtrace during the
> hang.
>
> Debugger entered--Lisp error: (quit)
>   count-lines(1 1)
>   line-number-at-pos(70)
>   filepos-to-bufferpos(1116 approximate)
>   Info-find-node-2("/home/horn/Repos/el/emacs/info/emacs" "Top" nil nil)
>   Info-find-node("emacs" "Top" nil nil)
>   Info-goto-node("(emacs)" nil)
>   Info-menu("Emacs" nil)
>   funcall-interactively(Info-menu "Emacs" nil)
>   call-interactively(Info-menu nil nil)
>   command-execute(Info-menu)
>

Not unsurprisingly, git bisect points at this commit as the culprit:

commit b95f53f0383b5df82e0b711f5027881950893f4f
Author: Stefan Monnier <monnier <at> iro.umontreal.ca>
Date:   Mon Jun 15 18:48:08 2015 -0400

    * lisp/info.el: Cleanup bytepos/charpos issues
    
    * lisp/international/mule-util.el: Use lexical-binding.
    (filepos-to-bufferpos): New function.
    * lisp/info.el (Info-find-in-tag-table-1): Use 0-based file positions.
    (Info-find-node-2): Use filepos-to-bufferpos (bug#20704).
    (Info-read-subfile, Info-search): Use 0-based file positions.

and updating to the commit just before makes the issue go away.

Robert

Message #13 received at 20825-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Tassilo Horn <tsdh <at> gnu.org>
Cc: 20825-done <at> debbugs.gnu.org
Subject: Re: bug#20825: 25.0.50; Cannot view info docs anymore (100% CPU)
Date: Tue, 16 Jun 2015 17:38:56 +0300

> From: Tassilo Horn <tsdh <at> gnu.org>
> Date: Tue, 16 Jun 2015 09:06:55 +0200
> 
> With emacs HEAD e80225000dda3f1deac5ea95a9253301b05fbed7, emacs starts
> using up 100% CPU time when trying to view some info documentation.
> 
>   1. emacs -Q
>   2. C-h i
>      The info index is shown properly
>   3. m emacs RET
> 
> Now emacs starts using up 100% CPU, and the emacs info docs aren't
> shown.  With `debug-on-quit' I obtain the following backtrace during the
> hang.
> 
> Debugger entered--Lisp error: (quit)
>   count-lines(1 1)
>   line-number-at-pos(70)
>   filepos-to-bufferpos(1116 approximate)
>   Info-find-node-2("/home/horn/Repos/el/emacs/info/emacs" "Top" nil nil)
>   Info-find-node("emacs" "Top" nil nil)
>   Info-goto-node("(emacs)" nil)
>   Info-menu("Emacs" nil)
>   funcall-interactively(Info-menu "Emacs" nil)
>   call-interactively(Info-menu nil nil)
>   command-execute(Info-menu)

Fixed.

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