GNU bug report logs - #2106
end-of-defun loops on malformed python code

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Sid <bvk.groups <at> gmail.com>
To: emacs-pretest-bug <at> gnu.org
Cc: rfrancoise <at> debian.org
Subject: 23.0.60; which-function-mode locks up emacs 23 with 100% cpu
Date: Thu, 29 Jan 2009 20:18:20 +0530

hi,


I noticed that if i have which-function-mode enabled in my init script
(~/.emacs) and i open any malformed python file it locks up the emacs
window with 100% cpu utilization.  Python file doesn't show up on the
window and I have to cancel it by pressing C-g.

If i had desktop-save-mode enabled too and i start emacs in daemon
mode, I noticied that parent process simply waits for the child to
complete (because desktop session had this malformed python file
listed.)  What is worse is, if i kill parent process using C-c, i get
my terminal back, but the child continues to eat 100% cpu in the
background :-(

I found this with couple of days old CVS tree and also with
emacs-snapshot package from http://emacs.orebokech.com/.

Malformed python file content is:

    #!/usr/bin/env python
    
    from sqlalchemy import *
    from sqlalchemy.schema import *
    from sqlalchemy.orm import *
    
    class Person:
        pass
    
    mapper(Person, person_table, 
                         
    class Employee:
        pass
    

thanks,
bvk-chaitanya


In GNU Emacs 23.0.60.1 (i486-pc-linux-gnu, GTK+ Version 2.12.11)
 of 2009-01-27 on elegiac, modified by Debian
 (emacs-snapshot package, version 1:20090126-1)
configured using `configure  '--build' 'i486-linux-gnu' '--host' 'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/23.0.60/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.0.60/site-lisp:/usr/share/emacs/site-lisp' '--with-x=yes' '--with-x-toolkit=gtk' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g -Wl,--as-needed' 'CPPFLAGS=''

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_IN
  value of $XMODIFIERS: nil
  locale-coding-system: iso-latin-1-unix
  default-enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  which-function-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  global-auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
ESC [ > 0 ; 2 3 5 ; 0 c C-x b C-g C-x C-f d b . TAB 
RET ESC O B ESC x r e c DEL p o TAB r t - e m TAB 
RET

Recent messages:
Skipping dictionaries-common setup for emacs-snapshot
Loading /etc/emacs/site-start.d/50dictionaries-common.el (source)...done
Loading /etc/emacs/site-start.d/50festival.el (source)...done
Loading /etc/emacs/site-start.d/50psvn.el (source)...done
Loading /etc/emacs/site-start.d/50python-docutils.el (source)...done
Loading /etc/emacs/site-start.d/50ruby1.8-elisp.el (source)...done
Loading /etc/emacs/site-start.d/50yaml-mode.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Quit [2 times]
Making completion list...

Message #10 received at 2106 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Juanma Barranquero <lekktu <at> gmail.com>
To: Sid <bvk.groups <at> gmail.com>
Cc: rfrancoise <at> debian.org, 2106 <at> debbugs.gnu.org
Subject: Re: bug#2106: 23.0.60; which-function-mode locks up emacs 23 with 
	100% cpu
Date: Fri, 30 Jan 2009 09:53:08 +0100

On Thu, Jan 29, 2009 at 15:48, Sid <bvk.groups <at> gmail.com> wrote:

> I noticed that if i have which-function-mode enabled in my init script
> (~/.emacs) and i open any malformed python file it locks up the emacs
> window with 100% cpu utilization.

You don't even have to use which-function-mode. In your example, just
move the point to the last line and type C-M-e (that's end-of-defun).
It loops.

    Juanma

Message #15 received at 2106 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: BVK <bvk.groups <at> gmail.com>
To: Juanma Barranquero <lekktu <at> gmail.com>
Cc: rfrancoise <at> debian.org, 2106 <at> debbugs.gnu.org
Subject: Re: bug#2106: 23.0.60; which-function-mode locks up emacs 23 with 
	100% cpu
Date: Fri, 30 Jan 2009 15:08:46 +0530

On Fri, Jan 30, 2009 at 2:23 PM, Juanma Barranquero <lekktu <at> gmail.com> wrote:
>
> You don't even have to use which-function-mode. In your example, just
> move the point to the last line and type C-M-e (that's end-of-defun).
> It loops.
>


OK, then it must be a bug in emacs 23 python mode?


regards,
-- 
bvk-chaitanya

Message #20 received at 2106 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Juanma Barranquero <lekktu <at> gmail.com>
To: BVK <bvk.groups <at> gmail.com>
Cc: rfrancoise <at> debian.org, 2106 <at> debbugs.gnu.org
Subject: Re: bug#2106: 23.0.60; which-function-mode locks up emacs 23 with 
	100% cpu
Date: Fri, 30 Jan 2009 10:54:11 +0100

On Fri, Jan 30, 2009 at 10:38, BVK <bvk.groups <at> gmail.com> wrote:

> OK, then it must be a bug in emacs 23 python mode?

Yes, definitely. It is looping in python-mode functions, and it
doesn't happen in 22.X.

    Juanma

Message #29 received at 2106-done <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: Sid <bvk.groups <at> gmail.com>
Cc: Juanma Barranquero <lekktu <at> gmail.com>,
        2106-done <at> debbugs.gnu.org
Subject: Re: bug#2106: 23.0.60; which-function-mode locks up emacs 23 with 100% cpu
Date: Sat, 31 Jan 2009 11:22:01 -0500

This was not a bug in Python; it was a bug in end-of-defun, which was
"cleaned up" in Emacs 23.  I've checked in a fix.

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