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bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs
From: |
Michael Welsh Duggan |
Subject: |
bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs |
Date: |
Wed, 07 Apr 2021 08:42:59 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
martin rudalics <rudalics@gmx.at> writes:
>> Just a shot in the dark here. The only way I can think of this
>> occurring (Vwindow_list being too small), is that something modified
>> Vwindow_list when we don't expect it to be modified. I looked through
>> all the uses of Vwindow_list and window_list(), and they all look
>> kosher. The only modification seems to be setting Vwindow_list to nil.
>> But window_list() does call into lisp (nconc2, which calls Fnconc) when
>> constructing Vwindow_list, and it uses Vwindow_list as a temporary in
>> the process. Is it possible that during that call something happens
>> asynchronously (via gc?) that calls something that sets Vwindow_list
>> to nil again, while Vwindow_list is being constructed?
>
> Improbable but I attached some code that could detect such an
> incidence. Put a breakpoint at the
>
> Vwindow_list = window_list_2;
>
> line.
>
>> I don't think
>> so, off hand, but I'm grasping at straws.
>
> I also added a variable called `window-list-lengths' which records the
> last 20 or so last changes in the number of windows seen by window_list.
> Maybe you can detect some strange 2 ~> 6 or 6 ~> 2 change while running
> Gnus. I'm still not sure whether your daemon setup could be involved
> somehow.
I can run with this, but I am uncertain how I should be using it. What
should I be trapping on and looking at? I'm guessing the same process
as I used before, but we get another variable we can look at in the
process?
--
Michael Welsh Duggan
(md5i@md5i.com)
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, (continued)
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/04/05
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, martin rudalics, 2021/04/06
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/04/06
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, martin rudalics, 2021/04/06
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/04/06
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, martin rudalics, 2021/04/06
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/04/06
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/04/06
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Andreas Schwab, 2021/04/07
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, martin rudalics, 2021/04/07
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs,
Michael Welsh Duggan <=
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, martin rudalics, 2021/04/07
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/04/07
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, martin rudalics, 2021/04/07
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/04/07
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/04/07
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/04/07
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/04/07
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, martin rudalics, 2021/04/07
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, Michael Welsh Duggan, 2021/04/07
- bug#47244: 28.0.50; SIGSEGV in long-runnning Emacs, martin rudalics, 2021/04/08