GNU bug report logs - #5676
23.1.93; scroll bar redisplay bug locks up Emacs hard

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

From: Stephen Berman <stephen.berman <at> gmx.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 23.1.93; scroll bar redisplay bug locks up Emacs hard
Date: Wed, 03 Mar 2010 19:56:16 +0100

[Message part 1 (text/plain, inline)]

(I used M-x report-emacs-bug to report a bug, and it bounced, with this
feedback from the mailer-daemon: "A message that you sent could not be
delivered to one or more of its recipients. This is a permanent
error. The following address(es) failed: bug-gnu-emacs <at> gnu.org".  The
report included two long backtraces and perhaps the length is a
problem.  So I'm trying to repost now without the backtraces.  If this
works, I'll send the backtraces in separate followups.)

In GNU Emacs 23.1.93.1 (i686-pc-linux-gnu, GTK+ Version 2.18.6)
 of 2010-03-02 on escher
Windowing system distributor `The X.Org Foundation', version 11.0.10605000
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: @im=local
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

I've encountered a redisplay bug which locks up Emacs completely, C-g
has no effect.  I've seen two manifestions resulting from essentially
the same recipe, both involving the scroll bar.  In one manifestation,
the scroll bar vanishes when Emacs locks up; in the other, the scroll
bar flickers very rapidly.  I haven't been able to pin down exactly when
which manifestation occurs; maybe it's a timing issue.  However, the
lock up is reproducible, but under rather complex conditions.  I've
managed to pare down my initializations to a minimum amount that induces
the lock up.  Here is the recipe:

1. Let ~/.emacs consist of the attached file.  This loads the third
party library tabbar.el, available at
<http://emhacks.cvs.sourceforge.net/viewvc/*checkout*/emhacks/emhacks/tabbar.el?revision=1.69>,
so make sure to adjust the path in the load sexp.

2. Let ~/.newsrc consist of the following line:
gmane.linux.suse.opensuse.user: 1-110249
(Also, maybe there shouldn't be a nonempty directory ~/News/, though it
might not matter).

3. Start emacs.

4. Type M-x gnus, and when the Group buffer comes up, enter the
newsgroup gmane.linux.suse.opensuse.user

5. Type `j' (gnus-summary-goto-article) and at the prompt paste in this
Message-ID: 20100301190055.GP15950 <at> wahoo.no-ip.org

=> The scroll bar disappears and Emacs locks up hard.

I've reproduced this under gdb and gotten two different backtraces,
which I will post in followups, if this report makes it into the
bugtracker.

[.emacs_test (application/emacs-lisp, attachment)]

Message #8 received at 5676 <at> debbugs.gnu.org (full text, mbox):

From: Stephen Berman <stephen.berman <at> gmx.net>
To: 5676 <at> debbugs.gnu.org
Subject: Re: bug#5676: 23.1.93; scroll bar redisplay bug locks up Emacs hard
Date: Wed, 03 Mar 2010 23:13:13 +0100

[Message part 1 (text/plain, inline)]

Here's the first backtrace, which resulted from typing `C-c C-c'
(comint-interrupt-subjob) in shell-mode, from which I ran gdb.

[backtrace_scroll-bar_new (application/octet-stream, attachment)]

Message #11 received at 5676 <at> debbugs.gnu.org (full text, mbox):

From: Stephen Berman <stephen.berman <at> gmx.net>
To: 5676 <at> debbugs.gnu.org
Subject: Re: bug#5676: 23.1.93; scroll bar redisplay bug locks up Emacs hard
Date: Wed, 03 Mar 2010 23:15:04 +0100

[Message part 1 (text/plain, inline)]

Here's the second backtrace, which resulted from typing `C-c C-z'
(comint-stop-subjob).

[backtrace_scroll-bar_new_2 (application/octet-stream, attachment)]

Message #14 received at 5676 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Stephen Berman <stephen.berman <at> gmx.net>
Cc: 5676 <at> debbugs.gnu.org
Subject: Re: bug#5676: 23.1.93; scroll bar redisplay bug locks up Emacs hard
Date: Wed, 03 Mar 2010 19:41:26 -0500

Stephen Berman wrote:

> report included two long backtraces and perhaps the length is a
> problem.

For future reference, gzipping the backtraces reduces the size a lot.

Message #17 received at 5676 <at> debbugs.gnu.org (full text, mbox):

From: Stephen Berman <stephen.berman <at> gmx.net>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 5676 <at> debbugs.gnu.org
Subject: Re: bug#5676: 23.1.93; scroll bar redisplay bug locks up Emacs hard
Date: Thu, 04 Mar 2010 10:29:35 +0100

[Message part 1 (text/plain, inline)]

On Wed, 03 Mar 2010 19:41:26 -0500 Glenn Morris <rgm <at> gnu.org> wrote:

> Stephen Berman wrote:
>
>> report included two long backtraces and perhaps the length is a
>> problem.
>
> For future reference, gzipping the backtraces reduces the size a lot.

D'oh!  In the meantime, the first backtrace made it to the list, but not
the second one, so I guess it was by itself too large.  So here's the
next try, gzipped :-).  This backtrace resulted from typing `C-c C-z'
(comint-stop-subjob) in shell-mode.

Steve Berman

[backtrace_scroll-bar_new_2.gz (application/x-gzip, attachment)]

Message #20 received at 5676 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Stephen Berman <stephen.berman <at> gmx.net>
Cc: 5676 <at> debbugs.gnu.org
Subject: Re: bug#5676: 23.1.93; scroll bar redisplay bug locks up Emacs hard
Date: Wed, 26 Aug 2020 08:18:24 -0700

Stephen Berman <stephen.berman <at> gmx.net> writes:

> I've encountered a redisplay bug which locks up Emacs completely, C-g
> has no effect.  I've seen two manifestions resulting from essentially
> the same recipe, both involving the scroll bar.  In one manifestation,
> the scroll bar vanishes when Emacs locks up; in the other, the scroll
> bar flickers very rapidly.  I haven't been able to pin down exactly when
> which manifestation occurs; maybe it's a timing issue.  However, the
> lock up is reproducible, but under rather complex conditions.  I've
> managed to pare down my initializations to a minimum amount that induces
> the lock up.  Here is the recipe:
>
> 1. Let ~/.emacs consist of the attached file.  This loads the third
> party library tabbar.el, available at
> <http://emhacks.cvs.sourceforge.net/viewvc/*checkout*/emhacks/emhacks/tabbar.el?revision=1.69>,
> so make sure to adjust the path in the load sexp.
>
> 2. Let ~/.newsrc consist of the following line:
> gmane.linux.suse.opensuse.user: 1-110249
> (Also, maybe there shouldn't be a nonempty directory ~/News/, though it
> might not matter).
>
> 3. Start emacs.
>
> 4. Type M-x gnus, and when the Group buffer comes up, enter the
> newsgroup gmane.linux.suse.opensuse.user
>
> 5. Type `j' (gnus-summary-goto-article) and at the prompt paste in this
> Message-ID: 20100301190055.GP15950 <at> wahoo.no-ip.org
>
> => The scroll bar disappears and Emacs locks up hard.
>
> I've reproduced this under gdb and gotten two different backtraces,
> which I will post in followups, if this report makes it into the
> bugtracker.

(That was 10 years ago.)

Can you reproduce this on a modern version of Emacs, such as the
recently released version 27.1?

Message #23 received at 5676 <at> debbugs.gnu.org (full text, mbox):

From: Stephen Berman <stephen.berman <at> gmx.net>
To: Stefan Kangas <stefan <at> marxist.se>
Cc: 5676 <at> debbugs.gnu.org
Subject: Re: bug#5676: 23.1.93; scroll bar redisplay bug locks up Emacs hard
Date: Wed, 26 Aug 2020 17:58:31 +0200

On Wed, 26 Aug 2020 08:18:24 -0700 Stefan Kangas <stefan <at> marxist.se> wrote:

> Stephen Berman <stephen.berman <at> gmx.net> writes:
>
>> I've encountered a redisplay bug which locks up Emacs completely, C-g
>> has no effect.  I've seen two manifestions resulting from essentially
>> the same recipe, both involving the scroll bar.  In one manifestation,
>> the scroll bar vanishes when Emacs locks up; in the other, the scroll
>> bar flickers very rapidly.  I haven't been able to pin down exactly when
>> which manifestation occurs; maybe it's a timing issue.  However, the
>> lock up is reproducible, but under rather complex conditions.  I've
>> managed to pare down my initializations to a minimum amount that induces
>> the lock up.  Here is the recipe:
>>
>> 1. Let ~/.emacs consist of the attached file.  This loads the third
>> party library tabbar.el, available at
>> <http://emhacks.cvs.sourceforge.net/viewvc/*checkout*/emhacks/emhacks/tabbar.el?revision=1.69>,
>> so make sure to adjust the path in the load sexp.
>>
>> 2. Let ~/.newsrc consist of the following line:
>> gmane.linux.suse.opensuse.user: 1-110249
>> (Also, maybe there shouldn't be a nonempty directory ~/News/, though it
>> might not matter).
>>
>> 3. Start emacs.
>>
>> 4. Type M-x gnus, and when the Group buffer comes up, enter the
>> newsgroup gmane.linux.suse.opensuse.user
>>
>> 5. Type `j' (gnus-summary-goto-article) and at the prompt paste in this
>> Message-ID: 20100301190055.GP15950 <at> wahoo.no-ip.org
>>
>> => The scroll bar disappears and Emacs locks up hard.
>>
>> I've reproduced this under gdb and gotten two different backtraces,
>> which I will post in followups, if this report makes it into the
>> bugtracker.
>
> (That was 10 years ago.)
>
> Can you reproduce this on a modern version of Emacs, such as the
> recently released version 27.1?

I tried, but too much has changed, e.g. the gmane news server and the
openSUSE group, both of which I could adjust to what I think are the
current versions, but I was unable to access the particular newsgroup
message and got no lock up.  So I guess this bug should be closed as
unreproducible.

Steve Berman

Message #26 received at 5676 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Stephen Berman <stephen.berman <at> gmx.net>
Cc: 5676 <at> debbugs.gnu.org
Subject: Re: bug#5676: 23.1.93; scroll bar redisplay bug locks up Emacs hard
Date: Wed, 26 Aug 2020 11:17:16 -0700

tags 5676 + unreproducible
close 5676
thanks

Stephen Berman <stephen.berman <at> gmx.net> writes:

> I tried, but too much has changed, e.g. the gmane news server and the
> openSUSE group, both of which I could adjust to what I think are the
> current versions, but I was unable to access the particular newsgroup
> message and got no lock up.  So I guess this bug should be closed as
> unreproducible.

Thanks, I'm therefore closing this bug now.

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