GNU bug report logs - #16368
24.3; freeze in cperl mode when editing a regexp

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

From: Vincent Lefevre <vincent <at> vinc17.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; freeze in cperl mode when editing a regexp
Date: Mon, 06 Jan 2014 02:28:29 +0100

Open a file in cperl mode containing the following line:

  /(\d{4})(?: +){2}/;

e.g.: "emacs -Q file" then M-x cperl-mode <RET>

Put the cursor over the second opening brace, and type <DEL>
several times to delete what is before "{2}". When one types
<DEL> at this point:

  /(\d{4})(?:{2}/;
             ^cursor

Emacs freezes. One can type C-g to interrupt.

One can also reproduce the bug by typing: /(\d{4})(?{2
Emacs freezes before the "2" appears.

This bug is also present with Emacs 23.

Bug also reported on:

  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=734325


In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.8.6)
 of 2013-12-22 on brahms, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11405000
System Description:	Debian GNU/Linux unstable (sid)

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=gtk3' '--with-toolkit-scroll-bars'
 '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 $LC_COLLATE: POSIX
  value of $LC_CTYPE: en_US.UTF-8
  value of $LC_TIME: en_DK
  value of $LANG: POSIX
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  display-time-mode: t
  show-paren-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
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<escape> x r e p o r t - e m <tab> <return>

Recent messages:
Loading /etc/emacs/site-start.d/50latex-cjk-common.el (source)...
Loading cjk-enc...done
Loading /etc/emacs/site-start.d/50latex-cjk-common.el (source)...done
Loading /etc/emacs/site-start.d/50latex-cjk-thai.el (source)...done
Loading /etc/emacs/site-start.d/50psvn.el (source)...done
Loading /etc/emacs/site-start.d/50rnc-mode.el (source)...done
Loading /etc/emacs/site-start.d/50w3m-el.el (source)...done
Loading /home/vinc17/share/emacs/site-lisp/mutteditor.el (source)...done
Loading time...done
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
/usr/share/emacs24/site-lisp/css-mode/css-mode hides /usr/share/emacs/site-lisp/css-mode/css-mode
/usr/share/emacs/site-lisp/autoconf/autotest-mode hides /usr/share/emacs/site-lisp/autotest-mode
/usr/share/emacs24/site-lisp/html-helper-mode/tempo hides /usr/share/emacs/24.3/lisp/tempo
/usr/share/emacs24/site-lisp/flim/hex-util hides /usr/share/emacs/24.3/lisp/hex-util
/usr/share/emacs24/site-lisp/flim/md4 hides /usr/share/emacs/24.3/lisp/md4
/usr/share/emacs24/site-lisp/dictionaries-common/flyspell hides /usr/share/emacs/24.3/lisp/textmodes/flyspell
/usr/share/emacs24/site-lisp/dictionaries-common/ispell hides /usr/share/emacs/24.3/lisp/textmodes/ispell
/usr/share/emacs24/site-lisp/css-mode/css-mode hides /usr/share/emacs/24.3/lisp/textmodes/css-mode
/usr/share/emacs24/site-lisp/flim/hmac-md5 hides /usr/share/emacs/24.3/lisp/net/hmac-md5
/usr/share/emacs24/site-lisp/flim/sasl-ntlm hides /usr/share/emacs/24.3/lisp/net/sasl-ntlm
/usr/share/emacs24/site-lisp/flim/sasl-cram hides /usr/share/emacs/24.3/lisp/net/sasl-cram
/usr/share/emacs24/site-lisp/flim/ntlm hides /usr/share/emacs/24.3/lisp/net/ntlm
/usr/share/emacs24/site-lisp/flim/sasl hides /usr/share/emacs/24.3/lisp/net/sasl
/usr/share/emacs24/site-lisp/flim/hmac-def hides /usr/share/emacs/24.3/lisp/net/hmac-def
/usr/share/emacs24/site-lisp/flim/sasl-digest hides /usr/share/emacs/24.3/lisp/net/sasl-digest
/usr/share/emacs24/site-lisp/latex-cjk-thai/thai-word hides /usr/share/emacs/24.3/lisp/language/thai-word
/usr/share/emacs24/site-lisp/html-helper-mode/html-helper-mode hides /usr/share/emacs/site-lisp/html-helper-mode/html-helper-mode
/usr/share/emacs24/site-lisp/html-helper-mode/hhm-config hides /usr/share/emacs/site-lisp/html-helper-mode/hhm-config
/usr/share/emacs24/site-lisp/html-helper-mode/tempo hides /usr/share/emacs/site-lisp/html-helper-mode/tempo
/usr/share/emacs24/site-lisp/html-helper-mode/visual-basic-mode hides /usr/share/emacs/site-lisp/html-helper-mode/visual-basic-mode

Features:
(shadow sort gnus-util mail-extr warnings emacsbug message format-spec
rfc822 mml easymenu mml-sec mm-decode mm-bodies mm-encode mail-parse
rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mail-utils time cus-start cus-load paren
cc-styles cc-align cc-engine cc-vars cc-defs w3m-load jabber-autoloads
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 system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty emacs)

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