bug#12834: 24.3.50; OS X selecting a font can lock Emacs

[Ivan Andrus]

I was recently forced into updaing to Mountain Lion and I noticed the
following problem. I never tried before so I don't know if it's a
problem on earlier versions of OS X.

Emacs -Q

(menu-set-font)

Then you can play around changing the font and size and everything seems
to work okay. However, if you try to type in a number for the font size
rather than select it from the list or by using the slider, then Emacs
stops responding.

-Ivan


In GNU Emacs 24.3.50.1 (i386-apple-darwin12.2.0, NS apple-appkit-1187.34)
of 2012-11-07 on oroszlan.local
Bzr revision: 110820 egg...@cs.ucla.edu-20121106204835-uoo6ermni0jtqqmp
Windowing system distributor `Apple', version 10.3.1187
Configured using:
`configure '--with-ns''

Important settings:
locale-coding-system: nil
default enable-multibyte-characters: t

Major mode: Help

Minor modes in effect:
which-function-mode: t
show-paren-mode: t
recentf-mode: t
msb-mode: t
minibuffer-depth-indicate-mode: t
global-hl-line-mode: t
delete-selection-mode: t
auto-image-file-mode: t
auto-insert-mode: t
yas/global-mode: t
yas/minor-mode: t
shell-dirtrack-mode: t
ido-everywhere: t
global-visible-mark-mode: t
visible-mark-mode: t
gvol-mode: t
desktop-save-mode: t
drag-stuff-global-mode: t
drag-stuff-mode: t
command-frequency-autosave-mode: t
command-frequency-mode: t
tooltip-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
buffer-read-only: t
column-number-mode: t
line-number-mode: t
transient-mark-mode: t

Recent input:
M-w TAB C-x C-f <return> C-M-j C-M-j C-M-j C-M-l C-x
C-e q M-w M-x c o m m <return> C-x 0 M-w M-w C-x C-f
M-k C-g C-x r j e C-c C-f <C-tab> <C-tab> C-k C-e <return>
, , s e t - f o l <backspace> n C-h f s e t - f o n
<tab> <tab> s <tab> <return> TAB C-e TAB C-h f <return>
<help-echo> <menu-bar> <options> <menu-set-font> <ns-change-font>
<help-echo> C-k C-a C-M-k C-x C-s C-h a f o n t <return>
<help-echo> C-x 1 C-x C-g C-h a <up> <return> <C-tab>
<help-echo> <help-echo> C-s s i z e C-s C-s C-s C-s
C-s C-s C-s C-s C-s C-s <down> <down> <down> <left>
<left> <left> <return> <C-tab> M-w <up> <C-right> <C-right>
<C-right> <C-right> <C-right> <C-right> <C-tab> <left>
<left> <down> <down> <return> <C-tab> C-k C-k C-M-k
M-x r e p o <return>

Recent messages:
Making completion list...
Type "q" in help window to restore its previous buffer, C-M-v to scroll help.

Auto-saving...done
Saving file /Users/gvol/.emacs.d/init.el...
Wrote /Users/gvol/.emacs.d/init.el
Mark saved where search started
Type "q" in help window to restore its previous buffer. [2 times]
byte-code: Buffer is read-only: #<buffer *Help*>
/Users/gvol/.emacs-uptimes

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emacs)

[Jan Djärv]

Hello.

I checked in a fix in the emacs-24 branch.

Jan D.

[Jan Djärv]

Hello.
Please keep the debbugs Cc.
Which version did you build? Are you sure you built the emacs-24 branch, not trunk?

Jan D.

13 nov 2012 kl. 12:24 skrev Ivan Andrus <darth...@gmail.com>:

> Unless I built the wrong version, it didn't solve it for me.
>
> -Ivan

[Ivan Andrus]

On Nov 13, 2012, at 4:19 PM, Jan Djärv <jan...@swipnet.se> wrote:

> Hello.

> Please keep the debbugs Cc.

Sorry. I always forget. I really wish it was the default reply-to.

> Which version did you build? Are you sure you built the emacs-24 branch, not trunk?

To be honest I'm not entirely sure how to figure that out. Every time I think I understand bzr it doesn't do what I think. Anyway, updating on the branch I get

$ bzr pull
Using saved parent location: bzr://bzr.savannah.gnu.org/emacs/emacs-24/
No revisions or tags to pull.

In src/nsterm.m I see

303 static void
304 hold_event (struct input_event *event)
305 {
306 if (hold_event_q.nr == hold_event_q.cap)
307 {
308 if (hold_event_q.cap == 0) hold_event_q.cap = 10;
309 else hold_event_q.cap *= 2;
310 hold_event_q.q = (struct input_event *)
311 xrealloc (hold_event_q.q, hold_event_q.cap * sizeof (*hold_event_q.q));
312 }
313
314 hold_event_q.q[hold_event_q.nr++] = *event;
315 /* Make sure ns_read_socket is called, i.e. we have input. */
316 kill (0, SIGIO);
317 }

which I think is the required change. I still see the problem. When I run under gdb I am unable to interrupt the process with Ctrl-C once it has stopped responding. I'm afraid I'm not sure how to help debug it otherwise. Sending SIGIO manually doesn't cause it to become responsive.

-Ivan

[Eli Zaretskii]

> From: Ivan Andrus <darth...@gmail.com>
> Date: Tue, 13 Nov 2012 19:40:02 +0100
> Cc: "12...@debbugs.gnu.org" <12...@debbugs.gnu.org>

>
> > Which version did you build? Are you sure you built the emacs-24 branch, not trunk?
>
> To be honest I'm not entirely sure how to figure that out.

Like this:

$ bzr revno

> Every time I think I understand bzr it doesn't do what I think. Anyway, updating on the branch I get
>
> $ bzr pull
> Using saved parent location: bzr://bzr.savannah.gnu.org/emacs/emacs-24/
> No revisions or tags to pull.

If emacs-24 is a bound branch, you need to say "bzr update", not
"bzr pull". To see if its a bound branch, type

$ cat .bzr/branch/branch.conf

If you see there a line "bound = True", then it's a bound branch.

[Jan Djärv]

Hello.

13 nov 2012 kl. 19:40 skrev Ivan Andrus <darth...@gmail.com>:

> On Nov 13, 2012, at 4:19 PM, Jan Djärv <jan...@swipnet.se> wrote:
>
>> Hello.
>> Please keep the debbugs Cc.
>
> Sorry. I always forget. I really wish it was the default reply-to.
>

>> Which version did you build? Are you sure you built the emacs-24 branch, not trunk?
>

> To be honest I'm not entirely sure how to figure that out. Every time I think I understand bzr it doesn't do what I think. Anyway, updating on the branch I get

>
> $ bzr pull
> Using saved parent location: bzr://bzr.savannah.gnu.org/emacs/emacs-24/
> No revisions or tags to pull.
>

> In src/nsterm.m I see
>
> 303 static void
> 304 hold_event (struct input_event *event)
> 305 {
> 306 if (hold_event_q.nr == hold_event_q.cap)
> 307 {
> 308 if (hold_event_q.cap == 0) hold_event_q.cap = 10;
> 309 else hold_event_q.cap *= 2;
> 310 hold_event_q.q = (struct input_event *)
> 311 xrealloc (hold_event_q.q, hold_event_q.cap * sizeof (*hold_event_q.q));
> 312 }
> 313
> 314 hold_event_q.q[hold_event_q.nr++] = *event;
> 315 /* Make sure ns_read_socket is called, i.e. we have input. */
> 316 kill (0, SIGIO);
> 317 }
>
> which I think is the required change. I still see the problem. When I run under gdb I am unable to interrupt the process with Ctrl-C once it has stopped responding. I'm afraid I'm not sure how to help debug it otherwise. Sending SIGIO manually doesn't cause it to become responsive.
>

That is the fix. Sending SIGIO manually is pointless. I can not reproduce the error anymore, so make sure you did make install, and give the exact steps you did to encounter the bug, starting from -Q.

Thanks,

Jan D.

[Ivan Andrus]

I ran make install to be sure.

./nextstep/Emacs.app/Contents/MacOS/Emacs -Q

Interestingly this opens ~/.emacs.d/abbref_defs which had an error on my machine. Is this expected with -Q? Anyway, it's probably not relevant to the discussion at hand since I see the same behaviour if I move .emacs.d entirely.

Then I run `menu-set-font', either from the menu or with C-x C-e. I can change the font and the size freely. Then I click in the "Size" text box. A few times this hasn't caused problems, but usually it causes Emacs to stop responding. The font panel still responds, but nothing changes in terms of the font displayed and it doesn't register typing etc. FWIW, I added a printf to hold_event and it gets called 3 times when I click on anything other than the text box, but only twice when I click on the text box.

Thanks for looking into this. I'm running 10.8.2 with home brew installed with the latest XCode installed. I recently upgraded from 10.6.8. I'm not sure what else might be at play.

-Ivan

[Jan Djärv]

Hello.

I can reproduce it sometimes, but not most of the times. Anyway, I made another checkin in the emacs-24 branch. Please try it.

Jan D.

[Ivan Andrus]

Well it went from being 100% reproducible to only about 10%. Although I haven't tested it exhaustively, it seems to only be a problem when I type in some ridiculously large font size e.g. 7000. So I think it's probably not really an issue.

-Ivan

[Jan Djärv]

Hello.

17 nov 2012 kl. 21:37 skrev Ivan Andrus <darth...@gmail.com>:

> Well it went from being 100% reproducible to only about 10%. Although I haven't tested it exhaustively, it seems to only be a problem when I type in some ridiculously large font size e.g. 7000. So I think it's probably not really an issue.
>

On my system a size of 7000 would not fit a whole character in an emacs frame even if it was fullscreen. I suspect the display engine might have some problem with that. Anyways, thatnks for testing.

Jan D.