GNU logs - #53871, boring messages

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#53871: 29.0.50; Emacs freezes with new child-frame option
Resent-From: Arash Esbati <arash@HIDDEN>
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To: 53871 <at> debbugs.gnu.org
From: Arash Esbati <arash@HIDDEN>
Date: Tue, 08 Feb 2022 09:42:22 +0100
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Hi all,

I'm trying the new option child-frame available for
`show-paren-context-when-offscreen' (introduced in 6e5d79c048) and I'm
running into an issue where Emacs freezes.  Steps to trigger:

1) emacs -Q
2) eval (setq show-paren-context-when-offscreen t) in scratch
3) M-x find-library RET paren RET
4) M-g c 13902 RET
5) With the mouse cursor, grab the scroll bar and move down so far to
   get the context
   'Matches (defun show-paren--show-context-in-child-frame (text)'
   in the echo area.
6) eval (setq show-paren-context-when-offscreen 'child-frame) in scratch
7) Repeat 5) and Emacs freezes

This is with repo-version 90eb6a7fe4 on Win10.

Best, Arash

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Arash Esbati <arash@HIDDEN>
Subject: bug#53871: Acknowledgement (29.0.50; Emacs freezes with new
 child-frame option)
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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#53871: 29.0.50; Emacs freezes with new child-frame option
Resent-From: Tassilo Horn <tsdh@HIDDEN>
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To: Arash Esbati <arash@HIDDEN>
Cc: 53871 <at> debbugs.gnu.org
From: Tassilo Horn <tsdh@HIDDEN>
References: <86leylvjf5.fsf@HIDDEN>
Date: Tue, 08 Feb 2022 11:35:17 +0100
In-Reply-To: <86leylvjf5.fsf@HIDDEN> (Arash Esbati's message of "Tue, 08 Feb
 2022 09:42:22 +0100")
Message-ID: <87pmnxy7bu.fsf@HIDDEN>
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Arash Esbati <arash@HIDDEN> writes:

Hi Arash,

> I'm trying the new option child-frame available for
> `show-paren-context-when-offscreen' (introduced in 6e5d79c048) and I'm
> running into an issue where Emacs freezes.  Steps to trigger:
>
> 1) emacs -Q
> 2) eval (setq show-paren-context-when-offscreen t) in scratch
> 3) M-x find-library RET paren RET
> 4) M-g c 13902 RET
> 5) With the mouse cursor, grab the scroll bar and move down so far to
>    get the context
>    'Matches (defun show-paren--show-context-in-child-frame (text)'
>    in the echo area.
> 6) eval (setq show-paren-context-when-offscreen 'child-frame) in scratch
> 7) Repeat 5) and Emacs freezes
>
> This is with repo-version 90eb6a7fe4 on Win10.

I can't reproduce with the slightly later version 9d1ae05442 on
GNU/Linux with a pgtk build.  When scroll up and down (only so far as to
keep point at the closing paren of the defun), I'll see the child frame
displaying the "(defun ...)" line whenever I stop scrolling for a
second.

After doing that for I while, I checked that `(frame-list)` still
contains just a single frame.  How is that for you?  Do you have many
frames in there?  And do you recover from the freeze?

Does doing the recipe with debug-on-quit set and then doing C-g when the
freeze occurs shed some light?

Bye,
Tassilo

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#53871: 29.0.50; Emacs freezes with new child-frame option
Resent-From: Arash Esbati <arash@HIDDEN>
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To: Tassilo Horn <tsdh@HIDDEN>
Cc: 53871 <at> debbugs.gnu.org
From: Arash Esbati <arash@HIDDEN>
References: <86leylvjf5.fsf@HIDDEN> <87pmnxy7bu.fsf@HIDDEN>
Date: Tue, 08 Feb 2022 13:06:31 +0100
In-Reply-To: <87pmnxy7bu.fsf@HIDDEN> (Tassilo Horn's message of "Tue, 08 Feb
 2022 11:35:17 +0100")
Message-ID: <86y22lwojc.fsf@HIDDEN>
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Hi Tassilo,

Tassilo Horn <tsdh@HIDDEN> writes:

> I can't reproduce with the slightly later version 9d1ae05442 on
> GNU/Linux with a pgtk build.  When scroll up and down (only so far as to
> keep point at the closing paren of the defun), I'll see the child frame
> displaying the "(defun ...)" line whenever I stop scrolling for a
> second.
>
> After doing that for I while, I checked that `(frame-list)` still
> contains just a single frame.  How is that for you?

Thanks for your response.  It is the same, only one frame.

> And do you recover from the freeze?

No recovery, Emacs freezes hard and I have to kill it from the shell.

> Does doing the recipe with debug-on-quit set and then doing C-g when the
> freeze occurs shed some light?

See above.  Interesting point is that scrolling with mouse wheel isn't a
problem, things play havoc if I touch the scroll bar with the mouse
pointer.

Best, Arash

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From: Tassilo Horn <tsdh@HIDDEN>
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Arash Esbati <arash@HIDDEN> writes:

>> After doing that for I while, I checked that `(frame-list)` still
>> contains just a single frame.  How is that for you?
>
> Thanks for your response.  It is the same, only one frame.

Hm, `frame-list' says it doesn't return "tooltip frames".  I think
that's something else than child frames but you might try
`(frames-on-display-list)', too.  It should also return a single frame
unless a show-paren child-frame is still visible.

>> And do you recover from the freeze?
>
> No recovery, Emacs freezes hard and I have to kill it from the shell.

Could you get a backtrace with GDB?  Basically just

  $ gdb src/emacs -x src/.gdbinit
  > run
  # do your scroll stuff until it freezes and then hit C-z in gdb and do
  > xbacktrace # get a lisp backtrace
  > bt full    # get a C backtrace

The C backtrace is probably large so please compress is before attaching
it here.

>> Does doing the recipe with debug-on-quit set and then doing C-g when
>> the freeze occurs shed some light?
>
> See above.  Interesting point is that scrolling with mouse wheel isn't
> a problem, things play havoc if I touch the scroll bar with the mouse
> pointer.

Could you put a message in show-paren--show-context-in-child-frame just
to get a feeling of how often a child frame is created?

Bye,
Tassilo

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