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[debbugs-tracker] bug#34186: closed (26.1; locking up)

From: GNU bug Tracking System
Subject: [debbugs-tracker] bug#34186: closed (26.1; locking up)
Date: Fri, 25 Jan 2019 16:31:02 +0000

Your message dated Fri, 25 Jan 2019 16:30:07 +0000
with message-id <address@hidden>
and subject line Re: bug#34186: 26.1; locking up
has caused the debbugs.gnu.org bug report #34186,
regarding 26.1; locking up
to be marked as done.

(If you believe you have received this mail in error, please contact

34186: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=34186
GNU Bug Tracking System
Contact address@hidden with problems
--- Begin Message --- Subject: 26.1; locking up Date: Wed, 23 Jan 2019 10:24:09 -0600
Editing a C header file, I type
'#define AVL_iter(' and it locks up consistently and has to be killed
from another terminal, with CPU at 100%.

In GNU Emacs 26.1 (build 1, amd64-portbld-freebsd11.2)
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
avl.h has auto save data; consider M-x recover-this-file
Making completion list...

Configured using:
 'configure --disable-build-details --localstatedir=/var
 --with-gameuser=games:games --with-sound=no --without-cairo
 --without-dbus --without-gconf --without-gif --without-gsettings
 --with-x-toolkit=no --without-jpeg --without-lcms2 --without-m17n-flt
 --without-imagemagick --without-libotf --without-png
 --without-toolkit-scroll-bars --without-rsvg --without-tiff --without-x
 --without-xim --without-xpm --without-xwidgets --enable-acl
 --without-cairo --without-dbus --without-gconf --without-gif
 --with-gnutls --without-gsettings --without-jpeg --with-json
 --with-file-notification=kqueue --without-lcms2 --without-m17n-flt
 --without-imagemagick --with-mailutils --with-modules --without-libotf
 --without-png --without-toolkit-scroll-bars --without-rsvg
 --with-threads --without-tiff --without-xft --without-xim --with-xml2
 --without-xpm --without-xwidgets --with-x-toolkit=no
 --prefix=/usr/local --mandir=/usr/local/man --disable-silent-rules
 --build=amd64-portbld-freebsd11.2 'CFLAGS=-O2 -pipe -fstack-protector
 -isystem /usr/local/include -fno-strict-aliasing ' 'CPPFLAGS=-isystem
 /usr/local/include' 'LDFLAGS= -fstack-protector -L/usr/local/lib ''

Configured features:

Important settings:
  locale-coding-system: nil

Major mode: C/*l

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  menu-bar-mode: t
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Load-path shadows:
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Memory information:
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--- End Message ---
--- Begin Message --- Subject: Re: bug#34186: 26.1; locking up Date: Fri, 25 Jan 2019 16:30:07 +0000 User-agent: Mutt/1.10.1 (2018-07-13)
Hello, Eli and Michael.

On Thu, Jan 24, 2019 at 19:41:21 +0200, Eli Zaretskii wrote:
> > From: Michael Menefee <address@hidden>
> > Date: Thu, 24 Jan 2019 10:32:34 -0600
> > Cc: address@hidden

> > I have found the minimum necessary to consistently reproduce.  copy/paste 
> > this into something.c to see if you
> > get same results:

> > void *AVL_first(AVL_t *);
> > void *AVL_last(AVL_t *);
> > #define (<--- locks up with pressing open parenthesis

> Thanks, now I can reproduce this.  Alan, please take a look.

I've committed the following fix to the emacs-26 branch.  I'm closing
the bug.

@Michael: This patch should apply cleanly to your Emacs 26.1 version (in
directory .../emacs/lisp/progmodes).  If you apply it, please
byte-compile the file before using it.  (If you want any help with the
patching and/or byte-compiling, feel free to send me private email.)

commit 9078f34e84178553cd59bc03ac1b58cb56038436
Author: Alan Mackenzie <address@hidden>
Date:   Fri Jan 25 16:14:00 2019 +0000

    Fix a loop in c-fl-decl-start.  This fixes bug #34186.
    * lisp/progmodes/cc-mode.el (c-fl-decl-start) In the pair of operations
    c-syntactic-skip-backward and c-forward-syntactic-ws, ensure the latter
    doesn't come back to the position before the former, and break out of the
    enclosing loop if it does.

diff --git a/lisp/progmodes/cc-mode.el b/lisp/progmodes/cc-mode.el
index 8cbb4e8612..5283cfea6e 100644
--- a/lisp/progmodes/cc-mode.el
+++ b/lisp/progmodes/cc-mode.el
@@ -1487,6 +1487,7 @@ c-fl-decl-start
   ;; lock context (etc.) fontification.
   (goto-char pos)
   (let ((lit-start (c-literal-start))
+       old-pos
        (new-pos pos)
        bod-lim bo-decl)
@@ -1509,12 +1510,14 @@ c-fl-decl-start
        ;; Go to a less nested declaration each time round this loop.
+        (setq old-pos (point))
         (c-syntactic-skip-backward "^;{}" bod-lim t)
         (> (point) bod-lim)
         (progn (c-forward-syntactic-ws)
                ;; Have we got stuck in a comment at EOB?
                (not (and (eobp)
+        (< (point) old-pos)
         (progn (setq bo-decl (point))
                (or (not (looking-at c-protection-key))
                    (c-forward-keyword-clause 1)))

Alan Mackenzie (Nuremberg, Germany).

--- End Message ---

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