GNU logs - #34823, boring messages


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Subject: bug#34823: 27.0.50; re-search-forward infloop
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From: Vitalie Spinu <spinuvit@HIDDEN>
Date: Tue, 12 Mar 2019 11:49:40 +0100
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Hi,

In the context of markdown-mode I am seeing a font-lock infloop with a
relatively simple regexp:

 1) emacs -Q
 2) open a buffer with the following line

   "$_\t$tmp\t$cat\t$donor\t$stage\t$pool\t$rep\t$time\t$comment"'

 3) at bol eval (re-search-forward "\\(\\w[^\n]*\\)+}")
    which infloops

I see it with emacs 25, 26 and 27.0.5.

  Vitalie

----

In GNU Emacs 27.0.50 (build 7, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2018-08-31 built on Galago
Repository revision: 244b6827257fb0ec9c14f19b9dd01a0e1bee1d75
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Ubuntu 18.04.1 LTS

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
(New file)
Mark set
Quit [2 times]
Mark activated [4 times]
ido-read-internal: Command attempted to use minibuffer while in minibuffer
Quit [3 times]
ido-read-internal: Command attempted to use minibuffer while in minibuffer
Quit [2 times]
ad-Advice-delete-char: Text is read-only [3 times]

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 THREADS LCMS2

Important settings:
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  value of $LC_NUMERIC: nl_NL.UTF-8
  value of $LC_TIME: en_DK.UTF-8
  value of $LANG: en_GB.UTF-8
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Major mode: Fundamental

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/home/vspinu/Dropbox/ELPA/spinner-1.7.3/spinner hides ~/VC/spinner.el/spinner
/home/vspinu/Dropbox/ELPA/epl-20180205.2049/epl hides ~/VC/epl/epl
/home/vspinu/Dropbox/ELPA/dash-20180903.1042/dash hides ~/VC/dash.el/dash
/home/vspinu/Dropbox/ELPA/pkg-info-20150517.1143/pkg-info hides ~/VC/pkg-info.el/pkg-info
/home/vspinu/Dropbox/ELPA/projectile-20180824.2239/projectile hides ~/VC/projectile/projectile
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/home/vspinu/Dropbox/ELPA/auto-complete-20170125.245/auto-complete-config hides ~/VC/auto-complete/auto-complete-config
/home/vspinu/Dropbox/ELPA/auto-complete-20170125.245/auto-complete hides ~/VC/auto-complete/auto-complete
/home/vspinu/Dropbox/ELPA/color-theme-solarized-20171024.1525/solarized-theme hides ~/VC/solarized-emacs/solarized-theme
/home/vspinu/Dropbox/ELPA/queue-0.2/queue hides ~/Dropbox/.emacs.d/queue
~/VC/markdown-mode/markdown-mode hides ~/Dropbox/.emacs.d/markdown-mode
/home/vspinu/Dropbox/ELPA/rebox2-20121113.2100/rebox2 hides ~/Dropbox/.emacs.d/rebox2
~/Dropbox/.emacs.d/allout-widgets hides /home/vspinu/bin/emacs/lisp/allout-widgets
~/Dropbox/.emacs.d/allout hides /home/vspinu/bin/emacs/lisp/allout
/home/vspinu/Dropbox/ELPA/less-css-mode-20161001.453/less-css-mode hides /home/vspinu/bin/emacs/lisp/textmodes/less-css-mode
~/Dropbox/.emacs.d/org-protocol hides /home/vspinu/bin/emacs/lisp/org/org-protocol
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Features:
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Memory information:
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 (symbols 48 68247 1)
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 (strings 32 246201 16927)
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 (vectors 16 92395)
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 (buffers 992 16))




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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Vitalie Spinu <spinuvit@HIDDEN>
Subject: bug#34823: Acknowledgement (27.0.50; re-search-forward infloop)
Message-ID: <handler.34823.B.1552387798826.ack <at> debbugs.gnu.org>
References: <87y35kqse3.fsf@HIDDEN>
X-Gnu-PR-Message: ack 34823
X-Gnu-PR-Package: emacs
Reply-To: 34823 <at> debbugs.gnu.org
Date: Tue, 12 Mar 2019 10:50:01 +0000

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34823: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D34823
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X-Loop: help-debbugs@HIDDEN
Subject: bug#34823: 27.0.50; re-search-forward infloop
References: <87y35kqse3.fsf@HIDDEN>
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It is not actually an infinite loop; it just takes a very long time.

Your case is, more or less, essentially

(search-string "\\(?:a*\\)*b" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")

Try trimming the string, and you will see that the match does terminate =
(and fail); it is just super-linear in the length of the text.
This is a shortcoming of the general type of regexp engine used by =
Emacs.

To work around your problem, you should make the regexp less prone to =
backtracking. Try asking on the list help-gnu-emacs@HIDDEN for advice. =
Describe what text you wish to match as precisely as possible.





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merge 6640 34823
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