From: Jason Rumney <jasonr@gnu.org>
To: Stephen Berman <stephen.berman@gmx.net>, 891@emacsbugs.donarmstrong.com
Subject: bug#891: 23.0.60; Emacs aborts after buffer-swap-text
Date: Fri, 05 Sep 2008 07:06:57 +0800 [thread overview]
Message-ID: <48C06A11.10805@gnu.org> (raw)
In-Reply-To: <871vzzczi2.fsf@escher.local.home>
merge 891 716
reassign 716 emacs
reassign 805 emacs
thanks
Stephen Berman wrote:
> 1. emacs -Q
> 2. Load the library tabbar.el, available from
> http://emhacks.cvs.sourceforge.net/emhacks/emhacks/tabbar.el?revision=1.69&view=markup
> 3. M-x tabbar-mode
> 4. M-: (buffer-swap-text (get-buffer "*Messages*"))
> 5. C-c C-right (tabbar-forward)
> ==> Emacs aborts
>
This seems to be the same bug as has been happening with tar-mode on
Windows since tar-mode was changed to use buffer-swap-text. So the
underlying bug is not platform specific after all. Do you also get
crashes when opening tar files in Emacs?
> The full backtrace is below. According to the Lisp backtrace, the abort
> occurs during or after switch-to-buffer. Yet typing C-x b after step 4
> above does not make Emacs abort. Moreover, when I directly call any of
> the tabbar.el functions listed in the backtrace and step through them
> with edebug, this also fails to make Emacs abort. Yet the above recipe
> is reliably reproducible.
>
> (Since the abort occurs in unshow_buffer, my guess, based on a comment
> at line 8314 of xdisp.c, is that switch-to-buffer needs to have
> something like the code in with_echo_area_buffer that changes w->pointm.
> I guess this would go after the call to Fset_buffer in switch-to-buffer,
> but I don't know how to write the code.)
>
Can this be done in Fbuffer_swap_text, rather than expecting other code
to clean up after the fact? Some of the crashes I've seen while
debugging this have not involved switch-to-buffer, so there are probably
many other locations where this clean up code needs to go if it can't be
done in Fbuffer_swap_text for some reason.
next prev parent reply other threads:[~2008-09-04 23:06 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-04 22:33 bug#891: 23.0.60; Emacs aborts after buffer-swap-text Stephen Berman
2008-09-04 23:06 ` Jason Rumney [this message]
2008-09-04 23:15 ` Processed (with 1 errors): " Emacs bug Tracking System
2008-09-05 8:32 ` Stephen Berman
2008-09-05 9:57 ` Jason Rumney
2008-09-05 10:05 ` Processed: " Emacs bug Tracking System
2008-09-05 3:52 ` Stefan Monnier
2008-09-05 8:32 ` Stephen Berman
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