GNU bug report logs - #47244
28.0.50; SIGSEGV in long-runnning Emacs

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Package: emacs;

Reported by: Michael Welsh Duggan <md5i <at> md5i.com>

Date: Thu, 18 Mar 2021 15:40:01 UTC

Severity: normal

Found in version 28.0.50

Done: Michael Welsh Duggan <mwd <at> md5i.com>

Bug is archived. No further changes may be made.

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Message #56 received at 47244 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>, Andreas Schwab <schwab <at> linux-m68k.org>
Cc: mwd <at> md5i.com, 47244 <at> debbugs.gnu.org, mwd <at> cert.org
Subject: Re: bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs
Date: Fri, 19 Mar 2021 09:15:07 +0100

>>> So the selected window's buffer was killed.  How is that possible?
>>
>> Perhaps during run_window_change_functions.
>
> Something like that, yes.  But I don't understand how that can happen
> technically: kill-buffer selects another buffer when killing the
> current one.  So how was that buffer killed, and yet stayed current?

It's a problem of any hook we run during redisplay:

(1) Redisplay chooses a window as the selected and its buffer as the
    current one.

(2) Lisp code in a hook deletes that window and/or its buffer.

(3) Redisplay continues to work on that window and/or its buffer as if
    it were still alive.

martin
This bug report was last modified 4 years and 28 days ago.

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