From: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
To: Po Lu <luangruo@yahoo.com>
Cc: 65193@debbugs.gnu.org
Subject: bug#65193: 29.1.50; SET_FRAME_ICONIFIED can cause Lisp evaluation inside read_socket_hook.
Date: Thu, 10 Aug 2023 18:21:26 +0900 [thread overview]
Message-ID: <wlttt7ntgp.wl-mituharu@math.s.chiba-u.ac.jp> (raw)
In-Reply-To: <87pm3vs3qf.fsf@yahoo.com>
On Thu, 10 Aug 2023 17:26:00 +0900,
Po Lu wrote:
>
> YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp> writes:
>
> > SET_FRAME_ICONIFIED has a call to gui_consider_frame_title and it can
> > cause Lisp evaluation if icon-title-format or frame-title-format
> > contains (:eval FORM). This is problematic because
> > SET_FRAME_ICONIFIED can be called inside read_socket_hook.
> >
> > The call to gui_consider_frame_title was introduced by the following
> > change:
>
> What practical problems have resulted from this change?
To my understanding, the Lisp evaluator is not reentrant, and thus
Lisp evaluation inside read_socket_hook, which can be called from
fairly arbitrary places via unblock_input/maybe_quit, causes
hard-to-reproduce, spontaneous crashes.
> There are already several situations under which Lisp can be called
> inside read_socket_hook.
That's really surprising. I've once heard we shouldn't do that. Is
that changed?
> And in principle, anything that performs GC can in turn call
> finalizers that subsequently run Lisp.
My understanding is that GC can only be triggered by eval_sub or
Ffuncall calls (except explicit garbage_collect calls), but not by
Lisp object allocations, for example. Avoiding Lisp evaluation inside
read_socket_hook also means avoiding GC inside read_socket_hook.
YAMAMOTO Mitsuharu
mituharu@math.s.chiba-u.ac.jp
next prev parent reply other threads:[~2023-08-10 9:21 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-10 7:41 bug#65193: 29.1.50; SET_FRAME_ICONIFIED can cause Lisp evaluation inside read_socket_hook YAMAMOTO Mitsuharu
2023-08-10 8:26 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-08-10 9:21 ` YAMAMOTO Mitsuharu [this message]
2023-08-10 13:03 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-08-10 16:32 ` YAMAMOTO Mitsuharu
2023-08-11 0:02 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-08-10 16:33 ` YAMAMOTO Mitsuharu
2023-08-10 17:58 ` Eli Zaretskii
2023-08-10 23:29 ` YAMAMOTO Mitsuharu
2023-08-12 7:30 ` Eli Zaretskii
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