GNU bug report logs - #20995
24.5; uncomment XML file results in high CPU utilisation / hanging

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Package: emacs;

Reported by: Sam Halliday <sam.halliday <at> gmail.com>

Date: Mon, 6 Jul 2015 20:05:03 UTC

Severity: normal

Tags: confirmed, fixed

Merged with 16449, 22319, 24253, 28040

Found in versions 24.3.50, 24.5, 25.1.50, 25.2

Fixed in version 26.1

Done: npostavs <at> users.sourceforge.net

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#20995; Package emacs. (Mon, 06 Jul 2015 20:05:03 GMT) Full text and rfc822 format available.
Acknowledgement sent to Sam Halliday <sam.halliday <at> gmail.com>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Mon, 06 Jul 2015 20:05:03 GMT) Full text and rfc822 format available.

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

From: Sam Halliday <sam.halliday <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.5; uncomment XML file results in high CPU utilisation / hanging
Date: Mon, 06 Jul 2015 21:04:00 +0100

I just upgraded from 24.4 to 24.5 on Debian Jessie (self compiled) and
if I open an XML file containing the below information, and attempt to
M-: uncomment the last comment line in the file, Emacs eats 100%
CPU and I have to kill it. I can confirm that it works OK in 24.4:

=======================
<configuration scan="true" scanPeriod="3 seconds"> 
  <property name="PATTERN" value="%d{dd MMM yy HH:mm:ss.SSS} %logger{0} [%X{CONTEXT_ID} %thread] %-5level - %msg%n" /> 
  <turboFilter class="ch.qos.logback.classic.turbo.DuplicateMessageFilter"> 
    <cacheSize>1048576</cacheSize> 
  </turboFilter> 
  <appender name="file" class="ch.qos.logback.core.FileAppender"> 
    <file>test-output.log</file> 
    <append>false</append> 
    <encoder> 
      <pattern>${PATTERN}</pattern> 
    </encoder> 
  </appender> 
  <root level="${root-level:-INFO}"> 
    <appender-ref ref="file" /> 
  </root> 
  <logger name="org.apache" level="WARN" /> 
  <!-- <logger name="akka" level="DEBUG" /> --> 
  <!-- <logger name="testing" level="DEBUG" /> --> 

  <!-- <logger name="foo.bar" level="DEBUG" /> --> 
</configuration> 
=======================

The debugging below is probably useless. I encourage you to try this
yourself, ensuring that nXML mode is enabled.

I share my Emacs configuration, it is available here:

  https://github.com/fommil/dotfiles/tree/master/.emacs.d



In GNU Emacs 24.5.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.14.5)
 of 2015-07-05 on Samskara
Windowing system distributor `The X.Org Foundation', version 11.0.11604000
System Description:	Debian GNU/Linux 8.1 (jessie)

Configured using:
 `configure --prefix=/opt/emacs-24.5'

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

Major mode: Lisp Interaction

Minor modes in effect:
  persistent-scratch-autosave-mode: t
  global-auto-revert-mode: t
  global-subword-mode: t
  subword-mode: t
  show-paren-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-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
Loading /home/fommil/.emacs.d/local.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/org-compat hides /opt/emacs-24.5/lisp/org/org-compat
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/ox-odt hides /opt/emacs-24.5/lisp/org/ox-odt
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/ob-keys hides /opt/emacs-24.5/lisp/org/ob-keys
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/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/org-colview hides /opt/emacs-24.5/lisp/org/org-colview
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/ob-ref hides /opt/emacs-24.5/lisp/org/ob-ref
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/ob-sh hides /opt/emacs-24.5/lisp/org/ob-sh
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/ob-calc hides /opt/emacs-24.5/lisp/org/ob-calc
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/ob-latex hides /opt/emacs-24.5/lisp/org/ob-latex
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/ob-dot hides /opt/emacs-24.5/lisp/org/ob-dot
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/org-macro hides /opt/emacs-24.5/lisp/org/org-macro
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/org-crypt hides /opt/emacs-24.5/lisp/org/org-crypt
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/ob-css hides /opt/emacs-24.5/lisp/org/ob-css
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/org-agenda hides /opt/emacs-24.5/lisp/org/org-agenda
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/ob-comint hides /opt/emacs-24.5/lisp/org/ob-comint
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/org-feed hides /opt/emacs-24.5/lisp/org/org-feed
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/ox-md hides /opt/emacs-24.5/lisp/org/ox-md
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/org-attach hides /opt/emacs-24.5/lisp/org/org-attach
/home/fommil/.emacs.d/elpa/org-plus-contrib-20150629/ob hides /opt/emacs-24.5/lisp/org/ob
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Features:
(shadow sort face-remap darkroom flyspell ispell gnus-util mail-extr
emacsbug message format-spec rfc822 mml mml-sec mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util help-fns mail-prsvr mail-utils
darcula-theme edmacro kmacro cl-loaddefs cl-lib highlight-symbol
thingatpt persistent-scratch midnight malabar-mode-autoloads eieio-core
info easymenu package epg-config autorevert filenotify superword subword
paren time-date 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 135483 8631)
 (symbols 48 23118 0)
 (miscs 40 54 139)
 (strings 32 30491 17032)
 (string-bytes 1 881960)
 (vectors 16 14011)
 (vector-slots 8 440483 4179)
 (floats 8 82 73)
 (intervals 56 187 0)
 (buffers 960 11)
 (heap 1024 45124 1209))

-- 
Best regards,
Sam
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#20995; Package emacs. (Mon, 06 Jul 2015 20:20:03 GMT) Full text and rfc822 format available.

Message #8 received at 20995 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Sam Halliday <sam.halliday <at> gmail.com>
Cc: 20995 <at> debbugs.gnu.org
Subject: Re: bug#20995: 24.5;
 uncomment XML file results in high CPU utilisation / hanging
Date: Mon, 06 Jul 2015 16:19:13 -0400

Sam Halliday wrote:

> I just upgraded from 24.4 to 24.5 on Debian Jessie (self compiled) and
> if I open an XML file containing the below information, and attempt to
> M-: uncomment the last comment line in the file, Emacs eats 100%
> CPU and I have to kill it. I can confirm that it works OK in 24.4:

What does "M-: uncomment" mean? 
Please give a complete recipe starting from emacs -Q.

FWIW, works fine for me in 24.5 to mark the last comment line and use
M-x uncomment-region.
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#20995; Package emacs. (Mon, 06 Jul 2015 20:50:02 GMT) Full text and rfc822 format available.

Message #11 received at 20995 <at> debbugs.gnu.org (full text, mbox):

From: Sam Halliday <sam.halliday <at> gmail.com>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 20995 <at> debbugs.gnu.org
Subject: Re: bug#20995: 24.5;
 uncomment XML file results in high CPU utilisation / hanging
Date: Mon, 06 Jul 2015 21:49:26 +0100

[Message part 1 (text/plain, inline)]
Hi Glenn,

Sorry, I was being sloppy.

I tried to minimise the problem and enabling flyspell in the XML file
seems to be the culprit. So:

emacs -Q
M-x file-find "...xml file I gave you..."
M-x flyspell-mode
... go to final comment line...
M-; (i.e. M-x uncomment-region)


I did a (profiler-start) with (setq debug-on-quit t) and got this:

- flyspell-post-command-hook                                     1994  81%
 - byte-code                                                     1994  81%
  - flyspell-word                                                1992  81%
   - sgml-mode-flyspell-verify                                   1989  81%
    - sgml-lexical-context                                       1985  81%
     - sgml-parse-tag-backward                                   1985  81%
      - byte-code                                                1985  81%
       - forward-sexp                                            1985  81%
        - nxml-forward-balanced-item                             1985  81%
         - nxml-forward-single-balanced-item                     1985  81%
          - funcall                                              1985  81%
           + #<compiled 0xf573b1>                                1949  80%



[Message part 2 (text/plain, inline)]
Glenn Morris <rgm <at> gnu.org> writes:

> Sam Halliday wrote:
>
>> I just upgraded from 24.4 to 24.5 on Debian Jessie (self compiled) and
>> if I open an XML file containing the below information, and attempt to
>> M-: uncomment the last comment line in the file, Emacs eats 100%
>> CPU and I have to kill it. I can confirm that it works OK in 24.4:
>
> What does "M-: uncomment" mean? 
> Please give a complete recipe starting from emacs -Q.
>
> FWIW, works fine for me in 24.5 to mark the last comment line and use
> M-x uncomment-region.

-- 
Best regards,
Sam

[signature.asc (application/pgp-signature, inline)]
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#20995; Package emacs. (Mon, 06 Jul 2015 21:06:01 GMT) Full text and rfc822 format available.

Message #14 received at 20995 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Sam Halliday <sam.halliday <at> gmail.com>
Cc: 20995 <at> debbugs.gnu.org
Subject: Re: bug#20995: 24.5;
 uncomment XML file results in high CPU utilisation / hanging
Date: Mon, 06 Jul 2015 16:59:35 -0400

Sam Halliday wrote:

> I tried to minimise the problem and enabling flyspell in the XML file
> seems to be the culprit. So:

Thanks; this is http://debbugs.gnu.org/16449 .
Merged 16449 20995. Request was from Glenn Morris <rgm <at> gnu.org> to control <at> debbugs.gnu.org. (Mon, 06 Jul 2015 21:06:02 GMT) Full text and rfc822 format available.
Added tag(s) confirmed. Request was from Glenn Morris <rgm <at> gnu.org> to control <at> debbugs.gnu.org. (Mon, 06 Jul 2015 21:06:02 GMT) Full text and rfc822 format available.
Merged 16449 20995 22319. Request was from Glenn Morris <rgm <at> gnu.org> to control <at> debbugs.gnu.org. (Wed, 06 Jan 2016 18:01:01 GMT) Full text and rfc822 format available.
Merged 16449 20995 22319. Request was from Nicolas Petton <nicolas <at> petton.fr> to control <at> debbugs.gnu.org. (Wed, 06 Jan 2016 18:35:02 GMT) Full text and rfc822 format available.
Merged 16449 20995 22319 24253 28040. Request was from npostavs <at> users.sourceforge.net to control <at> debbugs.gnu.org. (Fri, 11 Aug 2017 01:06:02 GMT) Full text and rfc822 format available.
Added tag(s) fixed. Request was from npostavs <at> users.sourceforge.net to control <at> debbugs.gnu.org. (Sat, 12 Aug 2017 01:11:02 GMT) Full text and rfc822 format available.
bug marked as fixed in version 26.1, send any further explanations to 28040 <at> debbugs.gnu.org and Avinash Chopde <avinash <at> aczoom.com> Request was from npostavs <at> users.sourceforge.net to control <at> debbugs.gnu.org. (Sat, 12 Aug 2017 01:11:03 GMT) Full text and rfc822 format available.
bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Sat, 09 Sep 2017 11:24:03 GMT) Full text and rfc822 format available.
This bug report was last modified 7 years and 339 days ago.

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