GNU bug report logs - #71679
29.3; treesit-node-child function chokes and crashes emacs for nodes with large number of child nodes

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Mauritz Stenek <mstenek <at> disroot.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.3; treesit-node-child function chokes and crashes emacs for
 nodes with large number of child nodes
Date: Thu, 20 Jun 2024 09:08:31 -0600

The function `treesit-node-child` chokes when parsing a 
tree-sitter node with a large number of child nodes -- ie a large 
buffer string -- and causes emacs to crash.

To reproduce, load a large source file, and run this:

```
(let ((string (with-current-buffer
                 "<buffer name with a large number or lines>"
               (buffer-string)))
     (node (treesit-parse-string string <LANGUAGE>)))
 (treesit-node-child node 0 t))
```
(this assumes that the LANGUAGE-ts-mode and the LANGUAGE grammar 
are installed).

This crashed my emacs; here's the backtrace:

```
 emacs -q
Fatal error 11: Segmentation fault
Backtrace:
$HOME/.guix-profile/bin/emacs[0x571ecb]
$HOME/.guix-profile/bin/emacs[0x428355]
$HOME/.guix-profile/bin/emacs[0x428849]
$HOME/.guix-profile/bin/emacs[0x5704a8]
$HOME/.guix-profile/bin/emacs[0x570519]
/gnu/store/ln6hxqjvz6m9gdd9s97pivlqck7hzs99-glibc-2.35/lib/libc.so.6(+0x3d2a0)[0x7fe93f4fb2a0]
$HOME/.guix-profile/bin/emacs[0x5842b2]
$HOME/.guix-profile/bin/emacs[0x662d88]
$HOME/.guix-profile/bin/emacs[0x604b9d]
$HOME/.guix-profile/bin/emacs[0x602b1b]
$HOME/.guix-profile/bin/emacs[0x60350d]
/gnu/store/cigkk82q1f5wypljsc6nfs4sz9k1qi2b-emacs-29.3/bin/../lib/emacs/29.3/native-lisp/29.3-d9acad52/preloaded/progmodes/elisp-mode.eln(F656c6973702d2d6576616c2d6c6173742d736578702d7072696e742d76616c7565_elisp__eval_last_sexp_print_value_0+0x50)[0x7fe93cf44800]
$HOME/.guix-profile/bin/emacs[0x5dbf33]
/gnu/store/cigkk82q1f5wypljsc6nfs4sz9k1qi2b-emacs-29.3/bin/../lib/emacs/29.3/native-lisp/29.3-d9acad52/preloaded/progmodes/elisp-mode.eln(F656c6973702d2d6576616c2d6c6173742d73657870_elisp__eval_last_sexp_0+0x188)[0x7fe93cf44788]
$HOME/.guix-profile/bin/emacs[0x5dbf33]
/gnu/store/cigkk82q1f5wypljsc6nfs4sz9k1qi2b-emacs-29.3/bin/../lib/emacs/29.3/native-lisp/29.3-d9acad52/preloaded/progmodes/elisp-mode.eln(F6576616c2d6c6173742d73657870_eval_last_sexp_0+0x71)[0x7fe93cf44c11]
$HOME/.guix-profile/bin/emacs[0x5dbf33]
$HOME/.guix-profile/bin/emacs[0x5d7fbf]
$HOME/.guix-profile/bin/emacs[0x5dbf33]
$HOME/.guix-profile/bin/emacs[0x5d93e3]
/gnu/store/cigkk82q1f5wypljsc6nfs4sz9k1qi2b-emacs-29.3/bin/../lib/emacs/29.3/native-lisp/29.3-d9acad52/preloaded/simple.eln(F636f6d6d616e642d65786563757465_command_execute_0+0x2ed)[0x7fe93d721c9d]
$HOME/.guix-profile/bin/emacs[0x5dbf33]
$HOME/.guix-profile/bin/emacs[0x5651c5]
$HOME/.guix-profile/bin/emacs[0x5da697]
$HOME/.guix-profile/bin/emacs[0x5510ba]
$HOME/.guix-profile/bin/emacs[0x5da5f1]
$HOME/.guix-profile/bin/emacs[0x55105f]
$HOME/.guix-profile/bin/emacs[0x558033]
$HOME/.guix-profile/bin/emacs[0x5583aa]
$HOME/.guix-profile/bin/emacs[0x431069]
/gnu/store/ln6hxqjvz6m9gdd9s97pivlqck7hzs99-glibc-2.35/lib/libc.so.6(+0x291f7)[0x7fe93f4e71f7]
/gnu/store/ln6hxqjvz6m9gdd9s97pivlqck7hzs99-glibc-2.35/lib/libc.so.6(__libc_start_main+0x7c)[0x7fe93f4e72ac]
$HOME/.guix-profile/bin/emacs[0x431561]
[1]    50903 segmentation fault (core dumped)  emacs -q
```



In GNU Emacs 29.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 
3.24.41,
cairo version 1.18.0)
Windowing system distributor 'The X.Org Foundation', version 
11.0.12014000
System Description: Fedora Linux 40 (Workstation Edition)

Configured using:
'configure
CONFIG_SHELL=/gnu/store/v9p25q9l5nnaixkhpap5rnymmwbhf9rp-bash-minimal-5.1.16/bin/bash
SHELL=/gnu/store/v9p25q9l5nnaixkhpap5rnymmwbhf9rp-bash-minimal-5.1.16/bin/bash
--prefix=/gnu/store/cigkk82q1f5wypljsc6nfs4sz9k1qi2b-emacs-29.3
--enable-fast-install --with-cairo --with-modules
--with-native-compilation=aot --disable-build-details'
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ 
JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES
NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3
THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER X11 XDBE XIM XINPUT2 
XPM
GTK3 ZLIB
Important settings:
 value of $EMACSLOADPATH: 
 $HOME/.guix-profile/share/emacs/site-lisp:/gnu/store/cigkk82q1f5wypljsc6nfs4sz9k1qi2b-emacs-29.3/share/emacs/29.3/lisp
 value of $EMACSNATIVELOADPATH: 
 $HOME/.guix-profile/lib/emacs/native-site-lisp
 value of $LANG: en_US.UTF-8
 locale-coding-system: utf-8-unix

Major mode: Info

Minor modes in effect:
 server-mode: t
 recentf-mode: t
 save-place-mode: t
 global-subword-mode: t
 subword-mode: t
 lin-global-mode: t
 global-undo-tree-mode: t
 undo-tree-mode: t
 global-hl-line-mode: t
 mu4e-modeline-mode: t
 which-key-mode: t
 org-roam-db-autosync-mode: t
 global-auto-revert-mode: t
 minions-mode: t
 doom-modeline-mode: t
 global-diff-hl-mode: t
 shell-dirtrack-mode: t
 delete-selection-mode: t
 global-anzu-mode: t
 anzu-mode: t
 savehist-mode: t
 marginalia-mode: t
 vertico-mode: t
 override-global-mode: t
 projectile-mode: t
 cl-old-struct-compat-mode: 1
 tooltip-mode: t
 global-eldoc-mode: t
 show-paren-mode: t
 electric-indent-mode: t
 mouse-wheel-mode: t
 tool-bar-mode: t
 global-prettify-symbols-mode: t
 file-name-shadow-mode: t
 isearch-fold-quotes-mode: t
 global-font-lock-mode: t
 font-lock-mode: t
 buffer-read-only: t
 column-number-mode: 1
 line-number-mode: 1
 transient-mark-mode: t
 auto-composition-mode: t
 auto-encryption-mode: t
 auto-compression-mode: t
 abbrev-mode: t

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Memory information:
((conses 16 1927850 785601)
(symbols 48 59435 14)
(strings 32 1095495 38268)
(string-bytes 1 35316450)
(vectors 16 285572)
(vector-slots 8 3901367 139596)
(floats 8 59754 479)
(intervals 56 5873 873)
(buffers 984 18))

-- 
Mauritz Stenek <mstenek <at> disroot.org>

Message #8 received at 71679 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Mauritz Stenek <mstenek <at> disroot.org>
Cc: 71679 <at> debbugs.gnu.org
Subject: Re: bug#71679: 29.3;
 treesit-node-child function chokes and crashes emacs for nodes with
 large number of child nodes
Date: Thu, 20 Jun 2024 19:02:41 +0300

> Date: Thu, 20 Jun 2024 09:08:31 -0600
> From:  Mauritz Stenek via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> 
> The function `treesit-node-child` chokes when parsing a 
> tree-sitter node with a large number of child nodes -- ie a large 
> buffer string -- and causes emacs to crash.
> 
> To reproduce, load a large source file, and run this:
> 
> ```
> (let ((string (with-current-buffer
>                   "<buffer name with a large number or lines>"
>                 (buffer-string)))
>       (node (treesit-parse-string string <LANGUAGE>)))
>   (treesit-node-child node 0 t))
> ```
> (this assumes that the LANGUAGE-ts-mode and the LANGUAGE grammar 
> are installed).
> 
> This crashed my emacs; here's the backtrace:

Thanks, but please tell exactly which grammar you used and post a
"file with a large number of lines" that can be used to reproduce
this.

The backtrace you posted can only be interpreted on your system, so it
is important to have a reproduction recipe for us to look into the
problem.

Message #11 received at 71679 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Mauritz Stenek <mstenek <at> disroot.org>
Cc: 71679 <at> debbugs.gnu.org
Subject: Re: bug#71679: 29.3; treesit-node-child function chokes and crashes
 emacs for nodes with large number of child nodes
Date: Thu, 20 Jun 2024 19:50:05 +0300

[Please use Reply All to keep the bug tracker CC'ed.]

> From: Mauritz Stenek <mstenek <at> disroot.org>
> Date: Thu, 20 Jun 2024 10:36:09 -0600
> 
> Here's the recipe:
> 
> 1) launch emacs -q
> 
> 2) Execute the following:
> 
> ```
> (setq treesit-language-source-alist
>       '((julia 
>       "https://github.com/tree-sitter/tree-sitter-julia")))
> 
> (setq major-mode-remap-alist
>       '((julia-mode . julia-ts-mode)))
> 
> (treesit-install-language-grammar 'julia)
> ```

Thanks, but which julia-mode and julia-ts-mode are you using?

Or maybe it will be easier for everyone if you show a recipe with
java-ts-mode?

Message #14 received at 71679 <at> debbugs.gnu.org (full text, mbox):

From: Mauritz Stenek <mstenek <at> disroot.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 71679 <at> debbugs.gnu.org
Subject: Re: bug#71679: 29.3; treesit-node-child function chokes and crashes
 emacs for nodes with large number of child nodes
Date: Thu, 20 Jun 2024 11:07:28 -0600

On 2024-06-20 at 10:50, Eli Zaretskii <eliz <at> gnu.org> wrote:

> [Please use Reply All to keep the bug tracker CC'ed.]

Will do -- I'm new at this.

>> From: Mauritz Stenek <mstenek <at> disroot.org>
>> Date: Thu, 20 Jun 2024 10:36:09 -0600
>> 
>> Here's the recipe:
>> 
>> 1) launch emacs -q
>> 
>> 2) Execute the following:
>> 
>> ```
>> (setq treesit-language-source-alist
>>       '((julia 
>>       "https://github.com/tree-sitter/tree-sitter-julia")))
>> 
>> (setq major-mode-remap-alist
>>       '((julia-mode . julia-ts-mode)))
>> 
>> (treesit-install-language-grammar 'julia)
>> ```
>
> Thanks, but which julia-mode and julia-ts-mode are you using?

Julia mode: https://github.com/JuliaEditorSupport/julia-emacs
Julia ts mode: https://github.com/nick4f42/julia-ts-mode

> Or maybe it will be easier for everyone if you show a recipe 
> with
> java-ts-mode?

Its basically the same as the julia example, just replace the 
references to julia with java.

-- 
Mauritz Stenek <mstenek <at> disroot.org>

Message #17 received at 71679 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Mauritz Stenek <mstenek <at> disroot.org>
Cc: 71679 <at> debbugs.gnu.org
Subject: Re: bug#71679: 29.3; treesit-node-child function chokes and crashes
 emacs for nodes with large number of child nodes
Date: Thu, 20 Jun 2024 21:06:30 +0300

> From: Mauritz Stenek <mstenek <at> disroot.org>
> Cc: 71679 <at> debbugs.gnu.org
> Date: Thu, 20 Jun 2024 11:07:28 -0600
> 
> On 2024-06-20 at 10:50, Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
> > [Please use Reply All to keep the bug tracker CC'ed.]
> 
> Will do -- I'm new at this.
> 
> >> From: Mauritz Stenek <mstenek <at> disroot.org>
> >> Date: Thu, 20 Jun 2024 10:36:09 -0600
> >> 
> >> Here's the recipe:
> >> 
> >> 1) launch emacs -q
> >> 
> >> 2) Execute the following:
> >> 
> >> ```
> >> (setq treesit-language-source-alist
> >>       '((julia 
> >>       "https://github.com/tree-sitter/tree-sitter-julia")))
> >> 
> >> (setq major-mode-remap-alist
> >>       '((julia-mode . julia-ts-mode)))
> >> 
> >> (treesit-install-language-grammar 'julia)
> >> ```
> >
> > Thanks, but which julia-mode and julia-ts-mode are you using?
> 
> Julia mode: https://github.com/JuliaEditorSupport/julia-emacs
> Julia ts mode: https://github.com/nick4f42/julia-ts-mode
> 
> > Or maybe it will be easier for everyone if you show a recipe 
> > with
> > java-ts-mode?
> 
> Its basically the same as the julia example, just replace the 
> references to julia with java.

Thanks, but I cannot reproduce the crash with the Julia files.

Can anyone else reproduce this crash?

Message #20 received at 71679 <at> debbugs.gnu.org (full text, mbox):

From: Mauritz Stenek <mstenek <at> disroot.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 71679 <at> debbugs.gnu.org
Subject: Re: bug#71679: 29.3; treesit-node-child function chokes and crashes
 emacs for nodes with large number of child nodes
Date: Thu, 20 Jun 2024 12:24:24 -0600

On 2024-06-20 at 12:06, Eli Zaretskii <eliz <at> gnu.org> wrote:

> Thanks, but I cannot reproduce the crash with the Julia files.
>
> Can anyone else reproduce this crash?

So basically, `treesit-node-child` worked for you?

How can I generate a detailed stack trace?

-- 
Mauritz Stenek <mstenek <at> disroot.org>

Message #23 received at 71679 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Mauritz Stenek <mstenek <at> disroot.org>
Cc: 71679 <at> debbugs.gnu.org
Subject: Re: bug#71679: 29.3; treesit-node-child function chokes and crashes
 emacs for nodes with large number of child nodes
Date: Thu, 20 Jun 2024 21:35:25 +0300

> From: Mauritz Stenek <mstenek <at> disroot.org>
> Cc: 71679 <at> debbugs.gnu.org
> Date: Thu, 20 Jun 2024 12:24:24 -0600
> 
> On 2024-06-20 at 12:06, Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
> > Thanks, but I cannot reproduce the crash with the Julia files.
> >
> > Can anyone else reproduce this crash?
> 
> So basically, `treesit-node-child` worked for you?

Yes, with the recipe you provided.

> How can I generate a detailed stack trace?

Start Emacs from GDB, run your recipe, and when it crashes and GDB
kicks in, type

  (gdb) thread apply all bt

and post here everything GDB displays as result.

Message #26 received at 71679 <at> debbugs.gnu.org (full text, mbox):

From: Mauritz Stenek <mstenek <at> disroot.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 71679 <at> debbugs.gnu.org
Subject: Re: bug#71679: 29.3; treesit-node-child function chokes and crashes
 emacs for nodes with large number of child nodes
Date: Thu, 20 Jun 2024 13:05:03 -0600

On 2024-06-20 at 12:35, Eli Zaretskii <eliz <at> gnu.org> wrote:

> Start Emacs from GDB, run your recipe, and when it crashes and 
> GDB
> kicks in, type
>
>   (gdb) thread apply all bt
>
> and post here everything GDB displays as result.

I'm doing this:

   $ gdb -i=mi -p 238975 # the pid of `emacs -q`

but it freezes Emacs and I can't do anything with it.

is this how you "Start Emacs from GDB"?

-- 
Mauritz Stenek <mstenek <at> disroot.org>

Message #29 received at 71679 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Mauritz Stenek <mstenek <at> disroot.org>
Cc: 71679 <at> debbugs.gnu.org
Subject: Re: bug#71679: 29.3; treesit-node-child function chokes and crashes
 emacs for nodes with large number of child nodes
Date: Thu, 20 Jun 2024 22:10:14 +0300

> From: Mauritz Stenek <mstenek <at> disroot.org>
> Cc: 71679 <at> debbugs.gnu.org
> Date: Thu, 20 Jun 2024 13:05:03 -0600
> 
> On 2024-06-20 at 12:35, Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
> > Start Emacs from GDB, run your recipe, and when it crashes and 
> > GDB
> > kicks in, type
> >
> >   (gdb) thread apply all bt
> >
> > and post here everything GDB displays as result.
> 
> I'm doing this:
> 
>     $ gdb -i=mi -p 238975 # the pid of `emacs -q`
> 
> but it freezes Emacs and I can't do anything with it.

You need to say "continue" to let Emacs continue running after you
attach the debugger.

> Is this how you "Start Emacs from GDB"?

No, I usually start GDB first:

  $ gdb ./emacs
  ...
  (gdb) run -Q

But your way should also work, if you say "continue" after attaching
GDB.  And don't use -i=mi, since the MI interface is for another
program to drive GDB, it is not convenient for humans.

Message #32 received at 71679 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: mstenek <at> disroot.org
Cc: 71679 <at> debbugs.gnu.org
Subject: Re: bug#71679: 29.3;
 treesit-node-child function chokes and crashes emacs for nodes with
 large number of child nodes
Date: Thu, 20 Jun 2024 22:22:50 +0300

> Cc: 71679 <at> debbugs.gnu.org
> Date: Thu, 20 Jun 2024 22:10:14 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> > From: Mauritz Stenek <mstenek <at> disroot.org>
> > Cc: 71679 <at> debbugs.gnu.org
> > Date: Thu, 20 Jun 2024 13:05:03 -0600
> > 
> > On 2024-06-20 at 12:35, Eli Zaretskii <eliz <at> gnu.org> wrote:
> > 
> > > Start Emacs from GDB, run your recipe, and when it crashes and 
> > > GDB
> > > kicks in, type
> > >
> > >   (gdb) thread apply all bt
> > >
> > > and post here everything GDB displays as result.
> > 
> > I'm doing this:
> > 
> >     $ gdb -i=mi -p 238975 # the pid of `emacs -q`
> > 
> > but it freezes Emacs and I can't do anything with it.
> 
> You need to say "continue" to let Emacs continue running after you
> attach the debugger.
> 
> > Is this how you "Start Emacs from GDB"?
> 
> No, I usually start GDB first:
> 
>   $ gdb ./emacs
>   ...
>   (gdb) run -Q
> 
> But your way should also work, if you say "continue" after attaching
> GDB.  And don't use -i=mi, since the MI interface is for another
> program to drive GDB, it is not convenient for humans.

Actually, forget it.  I've succeeded in reproducing this here, and I
see that this problem was already fixed in the development sources.
The next Emacs release will have the bug fixed.

So I think we can close this bug.

Message #35 received at 71679 <at> debbugs.gnu.org (full text, mbox):

From: Mauritz Stenek <mstenek <at> disroot.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 71679 <at> debbugs.gnu.org
Subject: Re: bug#71679: 29.3; treesit-node-child function chokes and crashes
 emacs for nodes with large number of child nodes
Date: Thu, 20 Jun 2024 13:31:52 -0600

On 2024-06-20 at 13:10, Eli Zaretskii <eliz <at> gnu.org> wrote:

> But your way should also work, if you say "continue" after 
> attaching
> GDB.  And don't use -i=mi, since the MI interface is for another
> program to drive GDB, it is not convenient for humans.

I couldn't run it your way; running it without the `-i=mi`, this 
is what I get from gdb:

```
(gdb) continue
Continuing.

Thread 1 ".emacs-29.3-rea" received signal SIGSEGV, Segmentation 
fault.
0x0000000000584404 in ?? ()
(gdb) bt
#0  0x0000000000584404 in ?? ()
#1  0x0000000000662d88 in ?? ()
#2  0x0000000000604b9d in ?? ()
#3  0x0000000000602b1b in ?? ()
#4  0x000000000060350d in ?? ()
#5  0x00007f496d659800 in 
F656c6973702d2d6576616c2d6c6173742d736578702d7072696e742d76616c7565_elisp__eval_last_sexp_print_value_0 
()
  from 
  /gnu/store/cigkk82q1f5wypljsc6nfs4sz9k1qi2b-emacs-29.3/bin/../lib/emacs/29.3/native-lisp/29.3-d9acad52/preloaded/progmodes/elisp-mode.eln
#6  0x00000000005dbf33 in ?? ()
#7  0x00007f496d659788 in 
F656c6973702d2d6576616c2d6c6173742d73657870_elisp__eval_last_sexp_0 
()
  from 
  /gnu/store/cigkk82q1f5wypljsc6nfs4sz9k1qi2b-emacs-29.3/bin/../lib/emacs/29.3/native-lisp/29.3-d9acad52/preloaded/progmodes/elisp-mode.eln
#8  0x00000000005dbf33 in ?? ()
#9  0x00007f496d659c11 in 
F6576616c2d6c6173742d73657870_eval_last_sexp_0 ()
  from 
  /gnu/store/cigkk82q1f5wypljsc6nfs4sz9k1qi2b-emacs-29.3/bin/../lib/emacs/29.3/native-lisp/29.3-d9acad52/preloaded/progmodes/elisp-mode.eln
#10 0x00000000005dbf33 in ?? ()
#11 0x00000000005d7fbf in ?? ()
#12 0x00000000005dbf33 in ?? ()
#13 0x00000000005d93e3 in ?? ()
#14 0x00007f496ded5c9d in 
F636f6d6d616e642d65786563757465_command_execute_0 () from 
/gnu/store/cigkk82q1f5wypljsc6nfs4sz9k1qi2b-emacs-29.3/bin/../lib/emacs/29.3/native-lisp/29.3-d9acad52/preloaded/simple.eln
#15 0x00000000005dbf33 in ?? ()
#16 0x00000000005651c5 in ?? ()
#17 0x00000000005da697 in ?? ()
#18 0x00000000005510ba in ?? ()
#19 0x00000000005da5f1 in ?? ()
#20 0x000000000055105f in ?? ()
#21 0x0000000000558033 in ?? ()
#22 0x00000000005583aa in ?? ()
#23 0x0000000000431069 in ?? ()
#24 0x00007f496fc2d1f7 in __libc_start_call_main () from 
/gnu/store/ln6hxqjvz6m9gdd9s97pivlqck7hzs99-glibc-2.35/lib/libc.so.6
#25 0x00007f496fc2d2ac in __libc_start_main_impl () from 
/gnu/store/ln6hxqjvz6m9gdd9s97pivlqck7hzs99-glibc-2.35/lib/libc.so.6
#26 0x0000000000431561 in ?? ()
(gdb) continue
Continuing.

Thread 1 ".emacs-29.3-rea" received signal SIGSEGV, Segmentation 
fault.
0x00007f496fc8afec in __pthread_kill_implementation () from 
/gnu/store/ln6hxqjvz6m9gdd9s97pivlqck7hzs99-glibc-2.35/lib/libc.so.6
(gdb) continue
Continuing.
Couldn't get registers: No such process.
(gdb) [Thread 0x7f496be00640 (LWP 257704) exited]
[Thread 0x7f496ef9d100 (LWP 257702) exited]
[Thread 0x7f496c800640 (LWP 257703) exited]
[New process 257702]

Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.

The program is not being run.
```

Is this the expected backtrace output?

-- 
Mauritz Stenek <mstenek <at> disroot.org>

Message #38 received at 71679 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Mauritz Stenek <mstenek <at> disroot.org>
Cc: 71679 <at> debbugs.gnu.org
Subject: Re: bug#71679: 29.3; treesit-node-child function chokes and crashes
 emacs for nodes with large number of child nodes
Date: Thu, 20 Jun 2024 22:43:39 +0300

> From: Mauritz Stenek <mstenek <at> disroot.org>
> Cc: 71679 <at> debbugs.gnu.org
> Date: Thu, 20 Jun 2024 13:31:52 -0600
> 
> On 2024-06-20 at 13:10, Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
> > But your way should also work, if you say "continue" after 
> > attaching
> > GDB.  And don't use -i=mi, since the MI interface is for another
> > program to drive GDB, it is not convenient for humans.
> 
> I couldn't run it your way; running it without the `-i=mi`, this 
> is what I get from gdb:
> 
> ```
> (gdb) continue
> Continuing.
> 
> Thread 1 ".emacs-29.3-rea" received signal SIGSEGV, Segmentation 
> fault.
> 0x0000000000584404 in ?? ()
> (gdb) bt
> #0  0x0000000000584404 in ?? ()
> #1  0x0000000000662d88 in ?? ()
> #2  0x0000000000604b9d in ?? ()
> #3  0x0000000000602b1b in ?? ()
> #4  0x000000000060350d in ?? ()

This means your Emacs is stripped of debug information, so no useful
backtrace is possible.

But never mind: as I wrote earlier, I've reproduced this problem in
the stock Emacs 29.2, and then saw that we already fixed it in the
development sources.

Message #41 received at 71679 <at> debbugs.gnu.org (full text, mbox):

From: Mauritz Stenek <mstenek <at> disroot.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 71679 <at> debbugs.gnu.org
Subject: Re: bug#71679: 29.3; treesit-node-child function chokes and crashes
 emacs for nodes with large number of child nodes
Date: Thu, 20 Jun 2024 13:46:14 -0600

On 2024-06-20 at 13:22, Eli Zaretskii <eliz <at> gnu.org> wrote:

> Actually, forget it.  I've succeeded in reproducing this here, 
> and I
> see that this problem was already fixed in the development 
> sources.
> The next Emacs release will have the bug fixed.
>
> So I think we can close this bug.

Awesome, I'll practice patience -- with huge effort! -- till the 
next release.

I greatly appreciate your promptness in responding and learning 
how to use gdb a bit.

Thanks again.

-- 
Mauritz Stenek <mstenek <at> disroot.org>

Message #44 received at 71679 <at> debbugs.gnu.org (full text, mbox):

From: Mauritz Stenek <mstenek <at> disroot.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 71679 <at> debbugs.gnu.org
Subject: Re: bug#71679: 29.3; treesit-node-child function chokes and crashes
 emacs for nodes with large number of child nodes
Date: Thu, 20 Jun 2024 14:23:29 -0600

> Actually, forget it.  I've succeeded in reproducing this here, 
> and I
> see that this problem was already fixed in the development 
> sources.
> The next Emacs release will have the bug fixed.

I'm curious to know, where can I see this fix? is there a 
commit/patch?

Also, is there a schedule for the next release?

thanks.

-- 
Mauritz Stenek <mstenek <at> disroot.org>

Message #47 received at 71679 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Mauritz Stenek <mstenek <at> disroot.org>
Cc: 71679 <at> debbugs.gnu.org
Subject: Re: bug#71679: 29.3; treesit-node-child function chokes and crashes
 emacs for nodes with large number of child nodes
Date: Fri, 21 Jun 2024 08:55:53 +0300

> From: Mauritz Stenek <mstenek <at> disroot.org>
> Cc: 71679 <at> debbugs.gnu.org
> Date: Thu, 20 Jun 2024 13:46:14 -0600
> 
> On 2024-06-20 at 13:22, Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
> > Actually, forget it.  I've succeeded in reproducing this here, 
> > and I
> > see that this problem was already fixed in the development 
> > sources.
> > The next Emacs release will have the bug fixed.
> >
> > So I think we can close this bug.
> 
> Awesome, I'll practice patience -- with huge effort! -- till the 
> next release.

As luck would have it, we will have an emergency release of Emacs 29.4
in a couple of days, due to a security vulnerability, so you should be
able to have it sooner rather than later.

Message #52 received at 71679-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Mauritz Stenek <mstenek <at> disroot.org>
Cc: 71679-done <at> debbugs.gnu.org
Subject: Re: bug#71679: 29.3; treesit-node-child function chokes and crashes
 emacs for nodes with large number of child nodes
Date: Fri, 21 Jun 2024 09:04:41 +0300

> From: Mauritz Stenek <mstenek <at> disroot.org>
> Cc: 71679 <at> debbugs.gnu.org
> Date: Thu, 20 Jun 2024 14:23:29 -0600
> 
> 
> > Actually, forget it.  I've succeeded in reproducing this here, 
> > and I
> > see that this problem was already fixed in the development 
> > sources.
> > The next Emacs release will have the bug fixed.
> 
> I'm curious to know, where can I see this fix? is there a 
> commit/patch?

I think it's these two:

  commit 00360258caddc0d8cf29ba3d9971125a06f8959b
  Author:     Yuan Fu <casouri <at> gmail.com>
  AuthorDate: Sat Jun 1 10:33:18 2024 -0700
  Commit:     Yuan Fu <casouri <at> gmail.com>
  CommitDate: Sat Jun 1 10:33:18 2024 -0700

      Fix treesit-parse-string crash (bug#71012)

      Parsing a large file with treesit-parse-string and then printing the
      returned node crashes Emacs, because with-temp-buffer kills the temp
      buffer when treesit-parse-string returns, and print.c tries to access
      the node's position in the killed buffer.

      * lisp/treesit.el (treesit-parse-string): Don't use with-temp-buffer.

  commit 20af58d3a13ddb5c2ca376da8cdd3fde4833ca2d
  Author:     Yuan Fu <casouri <at> gmail.com>
  AuthorDate: Sat Jun 1 10:20:48 2024 -0700
  Commit:     Yuan Fu <casouri <at> gmail.com>
  CommitDate: Sat Jun 1 10:29:55 2024 -0700

      Check for buffer liveness when accessing tree-sitter node (bug#71012)

      * src/treesit.h (treesit_node_buffer_live_p): Declare function.
      * src/print.c (print_vectorlike): Print node without position if
      buffer is killed.
      * src/treesit.c (treesit_node_buffer_live_p): New function.
      (treesit_check_node): Add buffer liveness check.
      (syms_of_treesit): New error treesit-node-buffer-killed.

> Also, is there a schedule for the next release?

Answered that already in my other mail.

And with that, I'm closing this bug.

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