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Subject: bug#68940: 29.2; Random crashes in face for char / font
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This was introduced in 29.2, works in 29.1.

1. emacs -Q does not crash

2. bisected it to the following ...

(use-package org
  :config
  (setq org-ellipsis (if (char-displayable-p ?=E2=8F=B7) "\t=E2=8F=B7" nil)=
))

... this randomly crashes (wild guess 80%). When it doesn't crash
(rare), it works as expected, even w/ the "=E2=8F=B7" character.

If I comment out this org-ellipsis line, everything's fine and it is not
crashing.

Here's the full report from the macOS:

https://gist.github.com/zrzka/373a8a860848efc9aa440dc1e8682a8b

If it does not help, I can build Emacs from source with the debug info,
and run it from gdb.


In GNU Emacs 29.2 (build 1, aarch64-apple-darwin21.6.0, NS
appkit-2113.60 Version 12.6.6 (Build 21G646)) of 2024-01-18 built on
armbob.lan
Windowing system distributor 'Apple', version 10.3.2487
System Description:  macOS 14.3

Configured using:
 'configure --with-ns '--enable-locallisppath=3D/Library/Application
Support/Emacs/${version}/site-lisp:/Library/Application
Support/Emacs/site-lisp' --with-modules 'CFLAGS=3D-DFD_SETSIZE=3D10000
-DDARWIN_UNLIMITED_SELECT' --with-x-toolkit=3Dno'

Configured features:
ACL GLIB GMP GNUTLS JPEG JSON LIBXML2 MODULES NOTIFY KQUEUE NS PDUMPER
PNG RSVG SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8

Major mode: ELisp/l

Minor modes in effect:
  ace-window-display-mode: t
  gcmh-mode: t
  goto-address-prog-mode: t
  subword-mode: t
  display-line-numbers-mode: t
  winner-mode: t
  delete-selection-mode: t
  global-auto-revert-mode: t
  electric-pair-mode: t
  global-hungry-delete-mode: t
  hungry-delete-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  server-mode: t
  save-place-mode: t
  recentf-mode: t
  savehist-mode: t
  default-text-scale-mode: t
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  pixel-scroll-precision-mode: t
  shell-dirtrack-mode: t
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  yas-global-mode: t
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  marginalia-mode: t
  which-key-mode: t
  windmove-mode: t
  override-global-mode: t
  direnv-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-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
  window-divider-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/Users/zrzka/.emacs.d/elpa/emacsql-sqlite-builtin-20240119.2314/emacsql-sql=
ite-builtin hides /Users/zrzka/.emacs.d/elpa/emacsql-20240124.1601/emacsql-=
sqlite-builtin
/Users/zrzka/.emacs.d/elpa/jsonrpc-1.0.24/jsonrpc hides /Applications/Emacs=
.app/Contents/Resources/lisp/jsonrpc
/Users/zrzka/.emacs.d/elpa/transient-20240201.1100/transient hides /Applica=
tions/Emacs.app/Contents/Resources/lisp/transient

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url-domsuf url-util mailcap url-handlers url-parse auth-source cl-seq
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Memory information:
((conses 16 741972 556806)
 (symbols 48 45280 0)
 (strings 32 204232 53998)
 (string-bytes 1 6071164)
 (vectors 16 72322)
 (vector-slots 8 857646 566423)
 (floats 8 424 2185)
 (intervals 56 900 77)
 (buffers 984 14))

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Robert Vojta <rvojta@HIDDEN>
Subject: bug#68940: Acknowledgement (29.2; Random crashes in face for char
 / font)
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Date: Mon, 05 Feb 2024 22:47:02 +0000

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Subject: bug#68940: 29.2; Random crashes in face for char / font
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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Date: Tue, 06 Feb 2024 14:23:31 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
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> Date: Mon, 05 Feb 2024 23:46:18 +0100
> From:  Robert Vojta via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> This was introduced in 29.2, works in 29.1.
> 
> 1. emacs -Q does not crash
> 
> 2. bisected it to the following ...
> 
> (use-package org
>   :config
>   (setq org-ellipsis (if (char-displayable-p ?⏷) "\t⏷" nil)))
> 
> ... this randomly crashes (wild guess 80%). When it doesn't crash
> (rare), it works as expected, even w/ the "⏷" character.
> 
> If I comment out this org-ellipsis line, everything's fine and it is not
> crashing.
> 
> Here's the full report from the macOS:
> 
> https://gist.github.com/zrzka/373a8a860848efc9aa440dc1e8682a8b

I cannot reproduce this, but I'm not on macOS.  Maybe it's
darwin-specific?

Just to clarify: if you start "emacs -Q", then evaluate

  M-: (setq org-ellipsis (if (char-displayable-p ?⏷) "\t⏷" nil)) RET

then visit some Org file and try toggling visibility (so that
org-ellipsis is used), does it crash?  If not, something else in your
customizations "helps" the bug to happen, perhaps some font-related
settings?  The crash backtrace seems to suggest the problem in
face_for_font, and that usually means you have some problematic font
in your setup.

Thanks.

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Subject: bug#68940: 29.2; Random crashes in face for char / font
Resent-From: Robert Vojta <rvojta@HIDDEN>
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> Just to clarify: if you start "emacs -Q", then evaluate
>
>   M-: (setq org-ellipsis (if (char-displayable-p ?=E2=8F=B7) "\t=E2=8F=B7=
" nil)) RET
>
> then visit some Org file and try toggling visibility (so that
> org-ellipsis is used), does it crash?

No, this one does not crash Emacs. If I get after the launch Emacs
phase, it works as expected, never crashed. An interesting fact - Emacs
launched with "--debug-init" & this ellipsis never crashed too.

 - "emacs -Q" =3D no crash, expected
 - "(setq org-ellipsis ...)" in my init.el
   - "emacs --debug-init" =3D no crash too, never crashed
   - "emacs" - crash in 80%, once running, never crashed

> If not, something else in your customizations "helps" the bug to
> happen, perhaps some font-related settings?

I'm using PragmataPro Mono font. I've tried another fonts, e.g. Menlo,
... and it is crashing w/ them too. It seems that it is not font
related.

I know that it does not crash with "emacs -Q", crashes w/ my config, and
I also know which line is causing it. Right now I'm trying to come up w/
a minimal init.el that can reproduce this issue.

Thanks.

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> From: Robert Vojta <rvojta@HIDDEN>
> Cc: 68940 <at> debbugs.gnu.org
> Date: Tue, 06 Feb 2024 13:29:00 +0100
> 
> I know that it does not crash with "emacs -Q", crashes w/ my config, and
> I also know which line is causing it. Right now I'm trying to come up w/
> a minimal init.el that can reproduce this issue.

Thanks, that will help, I hope.

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Small progress ... Compiled same version from source. Running
"src/emacs" makes it really hard to manually reproduce it. The crash
rate is very very low. I've added ...

  (run-with-timer (random 5) 0 'kill-emacs)

... at the end of my init.el file, and then ...

  while true ; do lldb --batch -o run -f src/emacs ; sleep 1; done

... not counting the number of attempts, but it took me +1 hour to
reproduce it. Here's the better backtrace:

  https://gist.github.com/zrzka/b01a3c8c013c5efcafd9fde6ac8b78a9

Now, I have two things to do:

 - Still figuring out the minimal init.el to reproduce
 
 - Build Emacs again, with all optimizations disabled, to be able to
   step through frames and see what's going on

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> From: Robert Vojta <rvojta@HIDDEN>
> Cc: 68940 <at> debbugs.gnu.org
> Date: Tue, 06 Feb 2024 16:55:02 +0100
> 
> ... not counting the number of attempts, but it took me +1 hour to
> reproduce it. Here's the better backtrace:
> 
>   https://gist.github.com/zrzka/b01a3c8c013c5efcafd9fde6ac8b78a9
> 
> Now, I have two things to do:
> 
>  - Still figuring out the minimal init.el to reproduce
>  
>  - Build Emacs again, with all optimizations disabled, to be able to
>    step through frames and see what's going on

Yes, what's important is to see what is value of base_face at entry to
face_for_font -- it sounds like that's an invalid face doer some
reason.  Do you have any customizations of the fontsets?

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> Yes, what's important is to see what is value of base_face at entry to
> face_for_font -- it sounds like that's an invalid face doer some
> reason.  Do you have any customizations of the fontsets?

No, no fontsets customizations.

This whole thing is getting weirder. I've recompiled Emacs w/ "-O0 -g3"
and two new things appeared:

1) Invalid read syntax: #

Warning (initialization): An error occurred while loading
=E2=80=98/Users/zrzka/.emacs.d/init.el=E2=80=99

This is random as well, and it happens frequently (30% of Emacs
launches).

2) A new crash happened

It is hard to reproduce it in my "while true; lldb ...; done" loop with
this error (a lot of manual interventios required), but managed to
capture another backtrace:

https://gist.github.com/zrzka/7855634a46adeacb2fa7e8f861e39106

All this, purely random, undefined behavior?

Recompiled again, this time I've added "-fsanitize=3Daddress" (full flags
"-O0 -g3 -fsanitize=3Daddress"), and the first thing (Invalid read syntax
#) is gone. Leaving it running for the whole night, to see what's gonna
happen now.

If it won't reveal anything, I will switch back to "-O0 -g3", and will
start bisecting 29.1 -> 29.2 changes.

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Address sanitizer gave me ...

  https://gist.github.com/zrzka/3506322a8e4e63fc6b323a48faad8f64

... heap user after free in "Automatic GC". When this happened, Emacs
was showing the mentioned init file load error, and weird character.

Don't know if it's related to my initial issue, if the problem is the
timer & kill, ...

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> From: Robert Vojta <rvojta@HIDDEN>
> Cc: 68940 <at> debbugs.gnu.org
> Date: Tue, 06 Feb 2024 22:59:23 +0100
> 
> > Yes, what's important is to see what is value of base_face at entry to
> > face_for_font -- it sounds like that's an invalid face doer some
> > reason.  Do you have any customizations of the fontsets?
> 
> No, no fontsets customizations.
> 
> This whole thing is getting weirder. I've recompiled Emacs w/ "-O0 -g3"
> and two new things appeared:
> 
> 1) Invalid read syntax: #

Did you clean up the source tree before rebuilding?  At least
"make distclean" is needed.

> Warning (initialization): An error occurred while loading
> ‘/Users/zrzka/.emacs.d/init.el’
> 
> This is random as well, and it happens frequently (30% of Emacs
> launches).

Did you try --debug-init?

> 
> 2) A new crash happened
> 
> It is hard to reproduce it in my "while true; lldb ...; done" loop with
> this error (a lot of manual interventios required), but managed to
> capture another backtrace:
> 
> https://gist.github.com/zrzka/7855634a46adeacb2fa7e8f861e39106
> 
> All this, purely random, undefined behavior?

I don't see why it could be undefined.  It seems to indicate that
c_strcasecmp crashes comparing an empty string, which is something it
is supposed to be able to handle.

I'm beginning to suspect some problem with your compiler or maybe even
with hardware (like some memory chip?).

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> From: Robert Vojta <rvojta@HIDDEN>
> Cc: Eli Zaretskii <eliz@HIDDEN>
> Date: Wed, 07 Feb 2024 08:41:34 +0100
> 
> Address sanitizer gave me ...
> 
>   https://gist.github.com/zrzka/3506322a8e4e63fc6b323a48faad8f64
> 
> ... heap user after free in "Automatic GC". When this happened, Emacs
> was showing the mentioned init file load error, and weird character.
> 
> Don't know if it's related to my initial issue, if the problem is the
> timer & kill, ...

Sorry, I have no idea.

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> Did you clean up the source tree before rebuilding?  At least
> "make distclean" is needed.

Yes. When rebuilding, it's always - distclean, configure, make, ...

> Did you try --debug-init?

Yes, many times, even with the loop & llvm --batch.

With --debug-init, the crash, or the invalid character, ... all the
issues from this thread / bug never happened, not even once.

> I don't see why it could be undefined.

Just a wild guess after seeing all this randomness.

> I'm beginning to suspect some problem with your compiler or maybe even
> with hardware (like some memory chip?).

Using Apple clang version 15.0.0 (clang-1500.1.0.2.5). All the issues
are happening with the binary I downloaded from
https://emacsformacosx.com/ too. Went to the source only to be able to
turn off optimizations, include debug info, ...

Might be a HW problem, will run a full HW test too.

Sorry for the noise so far, this randomness drives me crazy, and the
only thing exhibiting it is Emacs, rest is doing fine.

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Robert Vojta <rvojta@HIDDEN> writes:

> Address sanitizer gave me ...
>
>   https://gist.github.com/zrzka/3506322a8e4e63fc6b323a48faad8f64
>
> ... heap user after free in "Automatic GC". When this happened, Emacs
> was showing the mentioned init file load error, and weird character.
>
> Don't know if it's related to my initial issue, if the problem is the
> timer & kill, ...

I can't make sense of what is happening here: A marker M is created from
Lisp (point-marker), and later GC'd. So far so good, and nrmal, but some
later GC then finds M in a member of struct buffer. No idea how that's
possible.

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Robert Vojta <rvojta@HIDDEN> writes:

> Sorry for the noise so far, this randomness drives me crazy, and the
> only thing exhibiting it is Emacs, rest is doing fine.

I feel with you :-). There have been, and still are, strange things
happening with GUI Emacs on macOS. Although, I think it has improved
a lot over the last year or two.

Whatever. Some other ideas:

- Maybe configuring with --enable-checking can find something? That
  enables a number of asserts in the code, among them things that ASAN
  can't find.

- If it's a font thing, Font Book could be used to validate the font in
  question. Select the font in Font Book and use File > Validate
  Selection.

- One of my pet peeves: nsterm.m contains calls to C function
  redisplay(), which is known to be problematic, although I didn't have
  seens downright crashes from this yet. The problem is that such
  redisplays can clear the face cache in settings where this isn't
  expected. Maybe it's worth commenting out the calls and see if that
  makes a difference, phenomenologically. That's only a shot in the
  dark, though, only based on the crashes being in some face-related
  stuff.

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> From: Gerd M�llmann <gerd.moellmann@HIDDEN>
> Cc: 68940 <at> debbugs.gnu.org,  Eli Zaretskii <eliz@HIDDEN>
> Date: Thu, 08 Feb 2024 06:42:14 +0100
> 
> Robert Vojta <rvojta@HIDDEN> writes:
> 
> > Address sanitizer gave me ...
> >
> >   https://gist.github.com/zrzka/3506322a8e4e63fc6b323a48faad8f64
> >
> > ... heap user after free in "Automatic GC". When this happened, Emacs
> > was showing the mentioned init file load error, and weird character.
> >
> > Don't know if it's related to my initial issue, if the problem is the
> > timer & kill, ...
> 
> I can't make sense of what is happening here: A marker M is created from
> Lisp (point-marker), and later GC'd. So far so good, and nrmal, but some
> later GC then finds M in a member of struct buffer. No idea how that's
> possible.

Exactly my thoughts.  I suspect that it could be a bug in the address
sanitizer, perhaps triggered by our quite unique memory management.

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Eli Zaretskii <eliz@HIDDEN> writes:

>> From: Gerd M=C3=B6llmann <gerd.moellmann@HIDDEN>
>> Cc: 68940 <at> debbugs.gnu.org,  Eli Zaretskii <eliz@HIDDEN>
>> Date: Thu, 08 Feb 2024 06:42:14 +0100
>>=20
>> Robert Vojta <rvojta@HIDDEN> writes:
>>=20
>> > Address sanitizer gave me ...
>> >
>> >   https://gist.github.com/zrzka/3506322a8e4e63fc6b323a48faad8f64
>> >
>> > ... heap user after free in "Automatic GC". When this happened, Emacs
>> > was showing the mentioned init file load error, and weird character.
>> >
>> > Don't know if it's related to my initial issue, if the problem is the
>> > timer & kill, ...
>>=20
>> I can't make sense of what is happening here: A marker M is created from
>> Lisp (point-marker), and later GC'd. So far so good, and nrmal, but some
>> later GC then finds M in a member of struct buffer. No idea how that's
>> possible.
>
> Exactly my thoughts.  I suspect that it could be a bug in the address
> sanitizer, perhaps triggered by our quite unique memory management.

Maybe it would be worth upgrading to current LLVM? I think Robert
mentioned he is using LLVM 15 from Apple, and LLVM from Homebrew is now
at 17.0.6.

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> I feel with you :-). There have been, and still are, strange things
> happening with GUI Emacs on macOS. Although, I think it has improved a
> lot over the last year or two.

Thanks, I really thought that I'm mad while seeing all these random
crashes & backtraces ;)

> - Maybe configuring with --enable-checking can find something? That
>   enables a number of asserts in the code, among them things that ASAN
>   can't find.

Crashing with:

../../emacs/src/lisp.h:1314: Emacs fatal error: assertion failed:
FIXNUMP (a)

It always crashes. Sometimes with ^ & SIGABRT, sometimes w/o ^ &
SIGSEGV. 

> - If it's a font thing, Font Book could be used to validate the font in
>   question. Select the font in Font Book and use File > Validate
>   Selection.

I've tried:

  - Delete all my custom fonts -> crashing
  - Add back PragmataPro Mono, validate it, no issues -> crashing

>   expected. Maybe it's worth commenting out the calls and see if that
>   makes a difference, phenomenologically. That's only a shot in the

I've checked out d6c7092ff0713087f38b9492d53be0177af67514, configured
it with:

  CFLAGS="-DFD_SETSIZE=10000 -DDARWIN_UNLIMITED_SELECT -O0 -g3"
  configure --with-ns --with-modules --with-x-toolkit=no
    --enable-checking

Playing w/ "redisplay ();" in the "layoutSublayersOfLayer:", line 8732.

  - Kept - instant crash, 10/10 launches
  - Commented out - no crash, 10/10 launches

Shot in the dark, but it seems that it's somehow related to all this.

--- 

- I run the full HW diagnostics over night. Everything seems to be okay.

- Will try the new LLVM, yes, I'm using the one (15) from Apple now.

- Still figuring out the minimal reproducible init.el. Feeling like Don
Quixote now, comment out, no crash, aha, comment another line out,
crash, huh, revert, another combination, ...

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> ../../emacs/src/lisp.h:1314: Emacs fatal error: assertion failed:
> FIXNUMP (a)
Message-ID: <m27cjfs2d0.fsf@HIDDEN>
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Sorry, forgot to include the bt:

    frame #8: 0x000000010027c1f8 emacs`die(msg="FIXNUMP (a)", file="../../emacs/src/lisp.h", line=1314) at alloc.c:8062:3
    frame #9: 0x00000001003076b4 emacs`XFIXNUM(a=0x000000015b17036d) at lisp.h:1314:3
    frame #10: 0x0000000100307198 emacs`font_style_to_value(prop=FONT_WEIGHT_INDEX, val=0x000000015b17036d, noerror=true) at font.c:428:27
    frame #11: 0x0000000100310980 emacs`font_select_entity(f=0x000000015b172040, entities=0x0000000150ffef43, attrs=0x000000015ae06d60, pixel_size=12, c=9207) at font.c:3160:5
    frame #12: 0x00000001003104d0 emacs`font_find_for_lface(f=0x000000015b172040, attrs=0x000000015ae06d60, spec=0x000000015b085a15, c=9207) at font.c:3321:15
  * frame #13: 0x00000001003eba14 emacs`fontset_find_font(fontset=0x000000014b61c99d, c=9207, face=0x000000015ae06d60, charset_id=-1, fallback=false) at fontset.c:732:21
    frame #14: 0x00000001003e3490 emacs`fontset_font(fontset=0x000000012c209205, c=9207, face=0x000000015ae06d60, id=-1) at fontset.c:809:4
    frame #15: 0x00000001003e29a8 emacs`face_for_char(f=0x000000015b172040, face=0x000000015ae06d60, c=9207, pos=-1, object=0x0000000000000000) at fontset.c:1031:15
    frame #16: 0x000000010031995c emacs`FACE_FOR_CHAR(f=0x000000015b172040, face=0x000000015ae06d60, character=9207, pos=-1, object=0x0000000000000000) at dispextern.h:1950:10
    frame #17: 0x0000000100319658 emacs`Finternal_char_font(position=0x0000000000000000, ch=0x0000000000008fde) at font.c:4766:13

I will inspect the fontset, face, ... values in these frames later.

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Robert Vojta <rvojta@HIDDEN> writes:

>> - Maybe configuring with --enable-checking can find something? That
>>   enables a number of asserts in the code, among them things that ASAN
>>   can't find.
>
> Crashing with:
>
> ../../emacs/src/lisp.h:1314: Emacs fatal error: assertion failed:
> FIXNUMP (a)
>
> It always crashes. Sometimes with ^ & SIGABRT, sometimes w/o ^ &
> SIGSEGV.

I'll write something when answering your other mail.

>> - If it's a font thing, Font Book could be used to validate the font in
>>   question. Select the font in Font Book and use File > Validate
>>   Selection.
>
> I've tried:
>
>   - Delete all my custom fonts -> crashing
>   - Add back PragmataPro Mono, validate it, no issues -> crashing

I'd say we can exclude that, then.

>
>>   expected. Maybe it's worth commenting out the calls and see if that
>>   makes a difference, phenomenologically. That's only a shot in the
>
> I've checked out d6c7092ff0713087f38b9492d53be0177af67514, configured
> it with:

That's master, BTW, for other readers.

>
>   CFLAGS="-DFD_SETSIZE=10000 -DDARWIN_UNLIMITED_SELECT -O0 -g3"
>   configure --with-ns --with-modules --with-x-toolkit=no
>     --enable-checking
>
> Playing w/ "redisplay ();" in the "layoutSublayersOfLayer:", line 8732.
>
>   - Kept - instant crash, 10/10 launches
>   - Commented out - no crash, 10/10 launches
>
> Shot in the dark, but it seems that it's somehow related to all this.

Yeah ;-).

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Robert Vojta <rvojta@HIDDEN> writes:

>> ../../emacs/src/lisp.h:1314: Emacs fatal error: assertion failed:
>> FIXNUMP (a)
> Message-ID: <m27cjfs2d0.fsf@HIDDEN>
> MIME-Version: 1.0
> Content-Type: text/plain
>
> Sorry, forgot to include the bt:
>
>     frame #8: 0x000000010027c1f8 emacs`die(msg="FIXNUMP (a)", file="../../emacs/src/lisp.h", line=1314) at alloc.c:8062:3
>     frame #9: 0x00000001003076b4 emacs`XFIXNUM(a=0x000000015b17036d) at lisp.h:1314:3
>     frame #10: 0x0000000100307198
>     emacs`font_style_to_value(prop=FONT_WEIGHT_INDEX,
>     val=0x000000015b17036d, noerror=true) at font.c:428:27

Above, the parameter val seems to be neither a symbol nor a fixnum, and
that meads to an assertion in XFIXNUM.

>     frame #11: 0x0000000100310980
>     emacs`font_select_entity(f=0x000000015b172040,
>     entities=0x0000000150ffef43, attrs=0x000000015ae06d60,
>     pixel_size=12, c=9207) at font.c:3160:5

And here, we see that val comes from a Lisp face

    FONT_SET_STYLE (prefer, FONT_WEIGHT_INDEX, attrs[LFACE_WEIGHT_INDEX]);

which could mean the parameter attrs is bogus.

>     frame #12: 0x00000001003104d0
>     emacs`font_find_for_lface(f=0x000000015b172040,
>     attrs=0x000000015ae06d60, spec=0x000000015b085a15, c=9207) at
>     font.c:3321:15

Which would mean paramter attrs above is bogus.

>   * frame #13: 0x00000001003eba14
>   emacs`fontset_find_font(fontset=0x000000014b61c99d, c=9207,
>   face=0x000000015ae06d60, charset_id=-1, fallback=false) at
>   fontset.c:732:21

Which could mean the parameter face is bogus in the above.


>     frame #14: 0x00000001003e3490
>     emacs`fontset_font(fontset=0x000000012c209205, c=9207,
>     face=0x000000015ae06d60, id=-1) at fontset.c:809:4

Same here...

>     frame #15: 0x00000001003e29a8 emacs`face_for_char(f=0x000000015b172040, face=0x000000015ae06d60, c=9207, pos=-1, object=0x0000000000000000) at fontset.c:1031:15
>     frame #16: 0x000000010031995c emacs`FACE_FOR_CHAR(f=0x000000015b172040, face=0x000000015ae06d60, character=9207, pos=-1, object=0x0000000000000000) at dispextern.h:1950:10
>     frame #17: 0x0000000100319658 emacs`Finternal_char_font(position=0x0000000000000000, ch=0x0000000000008fde) at font.c:4766:13
>
> I will inspect the fontset, face, ... values in these frames later.

Hm. I'm quite out of my comfort zone here, regarding fontsets and fonts,
but it looks to me as if we're acting on a, for some reason, invalid
face, which would come from

  face_id = FACE_FOR_CHAR (f, FACE_FROM_ID (f, face_id), c, pos, Qnil);

in Finternal_char_font. Maybe one could take a look at *f->face_cache here?

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From: Robert Vojta <rvojta@HIDDEN>
Date: Fri, 09 Feb 2024 08:22:53 +0100
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> Hm. I'm quite out of my comfort zone here, regarding fontsets and fonts,
> but it looks to me as if we're acting on a, for some reason, invalid
> face, which would come from
>
>   face_id = FACE_FOR_CHAR (f, FACE_FROM_ID (f, face_id), c, pos, Qnil);
>
> in Finternal_char_font. Maybe one could take a look at *f->face_cache here?

Thanks for these pointers! This is an unknown territory for me, but I'll take
some time to read the code, ask our font experts, and try to figure out what's
going on here.

Last modified: Fri, 9 Feb 2024 07:30:02 UTC

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