From: Pip Cet <pipcet@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 21380@debbugs.gnu.org
Subject: bug#21380: 25.0.50; GTK-induced segfault when scheduling timer from window-configuration-change-hook
Date: Wed, 2 Sep 2015 16:09:53 +0000 [thread overview]
Message-ID: <CAOqdjBf4_h92OJU2foDFOUMMJGZADdgB28=Ch9q-gdEA7Ms6BQ@mail.gmail.com> (raw)
In-Reply-To: <83a8t4c10v.fsf@gnu.org>
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On Wed, Sep 2, 2015 at 3:08 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> > Date: Tue, 1 Sep 2015 20:48:18 +0000
> > From: Pip Cet <pipcet@gmail.com>
> > Cc: 21380@debbugs.gnu.org
> >
> > Alternatively, we could turn off atimers (by calling turn_on_atimers)
> > while Fcopy_sequence runs.
> >
> >
> > I think that would be a better solution. I've done a quick grep for the
> current
> > atimers and at first glance they appear to be okay, but obviously that's
> no
> > guarantee for the future. It might be worth thinking about
> > block_input_and_atimers ().
> >
> > I think it's safe to assume that Lisp timers are only checked if atimers
> are
> > enabled.
>
> Those are two completely separate and independent features, so no,
> it's not safe to make that assumption. Not sure why you need to
> assume that, though.
>
So we can call turn_on_atimers (true) without potentially enabling atimers
in a critical section.
My assumption was that the reason we have both Lisp timers and atimers is
that atimers run strictly more often than Lisp timers.
> > If it isn't, I think the best way forward is to write
> > block_input_and_atimers () and lock atimers with a counter just like
> input is.
>
> Not sure I follow you. Are you saying that just calling block_input
> followed by turn_on_atimers is somehow not enough to prevent some Lisp
> from changing Vtimer_list under our feet?
>
I'm not saying that, no, but if another function disables atimers, then
runs Lisp timers, then does something critical that needs atimers to be
disabled, it might break.
> --- a/src/fns.c
> > +++ b/src/fns.c
> > @@ -744,6 +744,9 @@ concat (ptrdiff_t nargs, Lisp_Object *args,
> > /* Store this element into the result. */
> > if (toindex < 0)
> > {
> > + if (NILP (tail))
> > + break;
> > +
>
> Is this part still needed?
As far as I know, the other two fixes are sufficient. It's needed in case
someone calls copy_sequence on a list that's messed with by code run from a
hook from QUIT, and merely succeeds in avoiding a segfault and producing
incorrect results instead, so I'm not at all sure it should go in.
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next prev parent reply other threads:[~2015-09-02 16:09 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-30 12:51 bug#21380: 25.0.50; GTK-induced segfault when scheduling timer from window-configuration-change-hook Pip Cet
2015-08-30 15:01 ` Eli Zaretskii
2015-08-30 15:24 ` Pip Cet
2015-08-30 15:27 ` Pip Cet
2015-08-30 16:24 ` Pip Cet
2015-08-30 18:10 ` martin rudalics
2015-08-30 18:20 ` Pip Cet
2015-08-30 19:50 ` Eli Zaretskii
2015-08-30 18:59 ` Pip Cet
2015-08-31 9:20 ` martin rudalics
2015-08-30 16:39 ` Eli Zaretskii
2015-08-30 16:42 ` Pip Cet
2015-08-30 19:44 ` Eli Zaretskii
2015-08-30 20:56 ` Pip Cet
2015-08-30 21:13 ` Pip Cet
2015-08-31 14:31 ` Eli Zaretskii
2015-09-01 10:20 ` Pip Cet
2015-09-01 15:03 ` Eli Zaretskii
2015-09-01 15:22 ` Pip Cet
2015-09-01 16:01 ` Eli Zaretskii
2015-09-01 16:02 ` Pip Cet
2015-09-01 16:23 ` Eli Zaretskii
2015-09-02 7:02 ` martin rudalics
2015-09-02 14:32 ` Eli Zaretskii
2015-09-03 15:36 ` Stefan Monnier
2015-09-05 7:38 ` Eli Zaretskii
2015-09-05 15:18 ` Stefan Monnier
2015-09-05 15:27 ` Eli Zaretskii
2015-09-06 22:11 ` Stefan Monnier
2022-04-29 12:52 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-04-29 13:40 ` Eli Zaretskii
2022-04-29 13:44 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-04-29 15:02 ` Pip Cet
2015-09-05 16:59 ` Pip Cet
2015-09-06 22:22 ` Stefan Monnier
2015-09-08 15:55 ` Pip Cet
2015-09-01 15:14 ` Pip Cet
2015-09-01 16:04 ` Eli Zaretskii
2015-09-01 16:56 ` Pip Cet
2015-09-01 17:19 ` Eli Zaretskii
2015-09-01 20:48 ` Pip Cet
2015-09-02 15:08 ` Eli Zaretskii
2015-09-02 16:09 ` Pip Cet [this message]
2015-09-02 19:13 ` Eli Zaretskii
2015-09-02 22:08 ` Pip Cet
2020-09-07 17:07 ` Lars Ingebrigtsen
2020-09-07 17:47 ` Pip Cet
2020-09-07 19:09 ` Eli Zaretskii
2020-09-08 9:57 ` Lars Ingebrigtsen
2022-04-29 12:14 ` Lars Ingebrigtsen
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