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bug#6942: 24.0.50; Uses 100% CPU and eats memory with trivial C++ code

From: Óscar Fuentes
Subject: bug#6942: 24.0.50; Uses 100% CPU and eats memory with trivial C++ code
Date: Mon, 30 Aug 2010 02:38:46 +0200

emacs -Q [ENTER]
C-x C-f foo.cpp [ENTER]
template <typename T,

As soon as the comma is typed, Emacs hangs and starts eating several MB
of RAM per second. Pressing C-g takes effect after a few seconds.

In GNU Emacs (x86_64-unknown-linux-gnu, X toolkit)
 of 2010-08-12 on qcore
Windowing system distributor `The X.Org Foundation', version 11.0.10706000
configured using `configure  '--without-toolkit-scroll-bars' 

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  whitespace-mode: t
  TeX-PDF-mode: t
  show-paren-mode: t
  diff-auto-refine-mode: t
  ido-everywhere: t
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-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

Recent input:
M-x g n u s <return> C-x C-g q y <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <menu-bar> 
<help-menu> <send-emacs-bug-report>

Recent messages:
Reading active file from archive via nnfolder...
Opening nnfolder server on archive...done
Reading active file from archive via nnfolder...done
No new newsgroups
Checking new news...
Opening nntp server on news.gmane.org...done
Checking new news...done
No more unread newsgroups
Are you sure you want to quit reading news? (y or n) 
(No changes need to be saved)

Load-path shadows:
~/elisp/magit hides /usr/local/share/emacs/site-lisp/magit

(shadow sort mail-extr emacsbug parse-time nnfolder pop3 nnml nndraft
nnmh auth-source netrc gnus-agent gnus-srvr gnus-score score-mode
nnvirtual gnus-msg gnus-art mm-uu mml2015 epg-config mm-view smime
password-cache dig mailcap nntp gnus-cache gnus-sum nnoo gnus-group
time-date gnus-undo nnmail mail-source format-spec smtpmail sendmail
gnus-start gnus-spec gnus-int gnus-range message rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mailabbrev gmm-utils mailheader gnus-win gnus gnus-ems
nnheader gnus-util mail-utils mm-util mail-prsvr package org-install
whitespace jka-compr find-func timeclock timeclock-x vc-git compile
comint lp0-mode preview prv-emacs info reporter desktop latex tex-style
tex-buf tex tex-site auto-loads paren uniquify magit ediff server
pcomplete psvn byte-opt warnings bytecomp byte-compile derived edmacro
kmacro wid-edit cl cl-19 log-edit ring pcvs-util add-log diff-mode pp
elp ediff-merg ediff-diff ediff-wind ediff-mult ediff-help ediff-init
ediff-util dired easymenu bbdb-autoloads bbdb regexp-opt timezone
easy-mmode ido advice help-fns advice-preload tooltip ediff-hook
vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image
fringe lisp-mode register page menu-bar rfn-eshadow timer select
scroll-bar mldrag 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 loaddefs button minibuffer faces cus-face files
text-properties overlay md5 base64 format env code-pages mule custom
widget hashtable-print-readable backquote make-network-process
dynamic-setting font-render-setting x-toolkit x multi-tty emacs)

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