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Subject: bug#71012: 30.0.50; tree-sitter crash
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From: Helmut Eller <eller.helmut@HIDDEN>
Date: Fri, 17 May 2024 15:39:27 +0200
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--=-=-=
Content-Type: text/plain
The code in the attached file tries to parse src/lisp.h but crashes
while printing the result: emacs --batch -l ts-bug.el
--=-=-=
Content-Type: application/emacs-lisp
Content-Disposition: attachment; filename=ts-bug.el
Content-Transfer-Encoding: quoted-printable
(require 'treesit)
(with-temp-buffer
(insert-file-contents "lisp.h")
(message "%s" (treesit-parse-string (buffer-string) 'c)))
--=-=-=
Content-Type: text/plain
Program received signal SIGSEGV, Segmentation fault.
0x000055555575c33a in buf_bytepos_to_charpos (b=0x555556074c60, bytepos=1)
at marker.c:343
343 eassert (bytepos >= BUF_Z_BYTE (b)
(gdb) ba 10
#0 0x000055555575c33a in buf_bytepos_to_charpos (b=0x555556074c60, bytepos=1)
at marker.c:343
#1 0x0000555555853509 in Ftreesit_node_start
(node=node@entry=XIL(0x55555605b225)) at treesit.c:1927
#2 0x00005555557f3f8a in print_vectorlike_unreadable
(obj=XIL(0x55555605b225), printcharfun=XIL(0), escapeflag=<optimized out>, buf=0x7fffffff7ef0 "dd\aVUU") at print.c:2051
#3 0x00005555557f1b85 in print_object
(obj=<optimized out>, printcharfun=<optimized out>, escapeflag=false)
at print.c:2642
#4 0x00005555557f2cf0 in Fprin1_to_string
(object=object@entry=XIL(0x55555605b225), noescape=XIL(0x30), overrides=overrides@entry=XIL(0)) at print.c:814
#5 0x00005555557b7c30 in styled_format
(nargs=2, args=args@entry=0x7fffffffda30, message=message@entry=true)
at editfns.c:3635
#6 0x00005555557b933f in Fformat_message
(args=0x7fffffffda30, nargs=<optimized out>) at editfns.c:3388
#7 Fmessage (args=0x7fffffffda30, nargs=<optimized out>) at editfns.c:3185
#8 Fmessage (nargs=<optimized out>, args=0x7fffffffda30) at editfns.c:3154
#9 0x00005555557c6b75 in eval_sub (form=<optimized out>)
at /scratch/emacs/emacs-git/src/lisp.h:2243
(More stack frames follow...)
In GNU Emacs 30.0.50 (build 6, x86_64-pc-linux-gnu, GTK+ Version
3.24.38, cairo version 1.16.0) of 2024-05-17 built on caladan
Repository revision: 6ca3a60db3427bc6aef08144c1524920ff3d9c4d
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101007
System Description: Debian GNU/Linux 12 (bookworm)
Configured using:
'configure --enable-checking --without-native-compiler
--with-xpm=ifavailable --with-gif=ifavailable
--with-native-compilation=no --with-tree-sitter'
Configured features:
CAIRO DBUS FREETYPE GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG LIBSELINUX
LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG SECCOMP SOUND
SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM
XINPUT2 GTK3 ZLIB
--=-=-=--
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Helmut Eller <eller.helmut@HIDDEN> Subject: bug#71012: Acknowledgement (30.0.50; tree-sitter crash) Message-ID: <handler.71012.B.171595318317067.ack <at> debbugs.gnu.org> References: <87ttiwpng0.fsf@HIDDEN> X-Gnu-PR-Message: ack 71012 X-Gnu-PR-Package: emacs Reply-To: 71012 <at> debbugs.gnu.org Date: Fri, 17 May 2024 13:40:01 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 71012 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 71012: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D71012 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
X-Loop: help-debbugs@HIDDEN
Subject: bug#71012: 30.0.50; tree-sitter crash
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <87ttiwpng0.fsf@HIDDEN> (message from Helmut Eller on Fri, 17
May 2024 15:39:27 +0200)
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> From: Helmut Eller <eller.helmut@HIDDEN>
> Date: Fri, 17 May 2024 15:39:27 +0200
>
> The code in the attached file tries to parse src/lisp.h but crashes
> while printing the result: emacs --batch -l ts-bug.el
Yuan, can you help, please?
Btw, why do you use treesit-parse-string? The Emacs integration with
tree-sitter can parse a buffer without making a string from its
contents.
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Subject: bug#71012: 30.0.50; tree-sitter crash
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From: Helmut Eller <eller.helmut@HIDDEN>
In-Reply-To: <86wmnsfodz.fsf@HIDDEN> (Eli Zaretskii's message of "Fri, 17 May
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> Btw, why do you use treesit-parse-string? The Emacs integration with
> tree-sitter can parse a buffer without making a string from its
> contents.
It's the first time that I use treesit. I just tried a few things.
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Subject: bug#71012: 30.0.50; tree-sitter crash
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> From: Helmut Eller <eller.helmut@HIDDEN>
> Cc: Yuan Fu <casouri@HIDDEN>, 71012 <at> debbugs.gnu.org
> Date: Fri, 17 May 2024 17:34:04 +0200
>
> > Btw, why do you use treesit-parse-string? The Emacs integration with
> > tree-sitter can parse a buffer without making a string from its
> > contents.
>
> It's the first time that I use treesit. I just tried a few things.
There's a chapter about it in the ELisp manual (the node "Parsing
Program Source"), in case you haven't read it.
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> On May 17, 2024, at 8:29 AM, Eli Zaretskii <eliz@HIDDEN> wrote:
>=20
>> From: Helmut Eller <eller.helmut@HIDDEN>
>> Date: Fri, 17 May 2024 15:39:27 +0200
>>=20
>> The code in the attached file tries to parse src/lisp.h but crashes
>> while printing the result: emacs --batch -l ts-bug.el
>=20
> Yuan, can you help, please?
>=20
> Btw, why do you use treesit-parse-string? The Emacs integration with
> tree-sitter can parse a buffer without making a string from its
> contents.
Yep, I=E2=80=99ll look into it.
Yuan=
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> On May 17, 2024, at 11:07=E2=80=AFPM, Yuan Fu <casouri@HIDDEN> =
wrote:
>=20
>=20
>=20
>> On May 17, 2024, at 8:29 AM, Eli Zaretskii <eliz@HIDDEN> wrote:
>>=20
>>> From: Helmut Eller <eller.helmut@HIDDEN>
>>> Date: Fri, 17 May 2024 15:39:27 +0200
>>>=20
>>> The code in the attached file tries to parse src/lisp.h but crashes
>>> while printing the result: emacs --batch -l ts-bug.el
>>=20
>> Yuan, can you help, please?
>>=20
>> Btw, why do you use treesit-parse-string? The Emacs integration with
>> tree-sitter can parse a buffer without making a string from its
>> contents.
>=20
> Yep, I=E2=80=99ll look into it.
>=20
> Yuan
Just an update, I didn=E2=80=99t forget about this. If I didn=E2=80=99t =
reply back today, I will in a few days :-)
Yuan=
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From: Yuan Fu <casouri@HIDDEN>
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> On May 27, 2024, at 3:10=E2=80=AFPM, Yuan Fu <casouri@HIDDEN> =
wrote:
>=20
>=20
>=20
>> On May 17, 2024, at 11:07=E2=80=AFPM, Yuan Fu <casouri@HIDDEN> =
wrote:
>>=20
>>=20
>>=20
>>> On May 17, 2024, at 8:29 AM, Eli Zaretskii <eliz@HIDDEN> wrote:
>>>=20
>>>> From: Helmut Eller <eller.helmut@HIDDEN>
>>>> Date: Fri, 17 May 2024 15:39:27 +0200
>>>>=20
>>>> The code in the attached file tries to parse src/lisp.h but crashes
>>>> while printing the result: emacs --batch -l ts-bug.el
>>>=20
>>> Yuan, can you help, please?
>>>=20
>>> Btw, why do you use treesit-parse-string? The Emacs integration =
with
>>> tree-sitter can parse a buffer without making a string from its
>>> contents.
>>=20
>> Yep, I=E2=80=99ll look into it.
>>=20
>> Yuan
>=20
> Just an update, I didn=E2=80=99t forget about this. If I didn=E2=80=99t =
reply back today, I will in a few days :-)
>=20
> Yuan
=46rom what I can gather, the crash seems to be because the temp buffer =
is garbage collected=E2=80=94the inserted lisp.h is a large file, so the =
temp buffer is probably immediately collected, before Emacs tries to =
print the node in the next line. I replaced the insert-file-content with =
some smaller file and it didn=E2=80=99t crash.
But that theory has critical flaws: a) Emacs certainly doesn't collect =
the temp buffer before the with-temp-buffer form returns; b) I can=E2=80=99=
t crash Emacs in my non-debug build by inserting (garbage-collect) in =
front of the message line in the example; c) debug build Emacs still =
crashes even if I enlarge gc-cons-threshold.
Eli, is there anything different regarding temp buffers in debug builds?
Yuan
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Subject: bug#71012: 30.0.50; tree-sitter crash
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From: Eli Zaretskii <eliz@HIDDEN>
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> From: Yuan Fu <casouri@HIDDEN>
> Date: Tue, 28 May 2024 22:15:05 -0700
> Cc: Helmut Eller <eller.helmut@HIDDEN>,
> 71012 <at> debbugs.gnu.org
>
> From what I can gather, the crash seems to be because the temp buffer is garbage collected—the inserted lisp.h is a large file, so the temp buffer is probably immediately collected, before Emacs tries to print the node in the next line. I replaced the insert-file-content with some smaller file and it didn’t crash.
It is unthinkable that a buffer is GC'ed while it is being used.
> But that theory has critical flaws: a) Emacs certainly doesn't collect the temp buffer before the with-temp-buffer form returns; b) I can’t crash Emacs in my non-debug build by inserting (garbage-collect) in front of the message line in the example; c) debug build Emacs still crashes even if I enlarge gc-cons-threshold.
>
> Eli, is there anything different regarding temp buffers in debug builds?
No.
But note that there are _two_ temporary buffers involved here: one is
created in ts-bug.el, and it remains intact and valid; the other is
the temporary buffer created by treesit-parse-string. That one is
killed by the time treesit-parse-string returns, so treesit-node-start
attempts to access positions of a killed buffer!
So I think this is a bug in treesit-parse-string: it cannot use
with-temp-buffer; instead, it should make the buffer into which it
inserts the string part of the parser, so that the buffer is killed
and GC'ed only when the parser is no longer referenced. Otherwise the
syntax tree returned by treesit-parse-string is unsafe to use.
X-Loop: help-debbugs@HIDDEN
Subject: bug#71012: 30.0.50; tree-sitter crash
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> On May 29, 2024, at 5:28=E2=80=AFAM, Eli Zaretskii <eliz@HIDDEN> =
wrote:
>=20
>> From: Yuan Fu <casouri@HIDDEN>
>> Date: Tue, 28 May 2024 22:15:05 -0700
>> Cc: Helmut Eller <eller.helmut@HIDDEN>,
>> 71012 <at> debbugs.gnu.org
>>=20
>> =46rom what I can gather, the crash seems to be because the temp =
buffer is garbage collected=E2=80=94the inserted lisp.h is a large file, =
so the temp buffer is probably immediately collected, before Emacs tries =
to print the node in the next line. I replaced the insert-file-content =
with some smaller file and it didn=E2=80=99t crash.
>=20
> It is unthinkable that a buffer is GC'ed while it is being used.
>=20
>> But that theory has critical flaws: a) Emacs certainly doesn't =
collect the temp buffer before the with-temp-buffer form returns; b) I =
can=E2=80=99t crash Emacs in my non-debug build by inserting =
(garbage-collect) in front of the message line in the example; c) debug =
build Emacs still crashes even if I enlarge gc-cons-threshold.
>>=20
>> Eli, is there anything different regarding temp buffers in debug =
builds?
>=20
> No.
>=20
> But note that there are _two_ temporary buffers involved here: one is
> created in ts-bug.el, and it remains intact and valid; the other is
> the temporary buffer created by treesit-parse-string. That one is
> killed by the time treesit-parse-string returns, so treesit-node-start
> attempts to access positions of a killed buffer!
>=20
> So I think this is a bug in treesit-parse-string: it cannot use
> with-temp-buffer; instead, it should make the buffer into which it
> inserts the string part of the parser, so that the buffer is killed
> and GC'ed only when the parser is no longer referenced. Otherwise the
> syntax tree returned by treesit-parse-string is unsafe to use.
I see, you=E2=80=99re absolutely right, thanks for the analysis! On top =
of that I need to make sure all the treesit function checks for buffer =
liveness before accessing the buffer. I was under the impression that a =
killed buffer would keep its content around until it=E2=80=99s =
collected. Turns out that wasn=E2=80=99t the case.
Yuan=
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> On Jun 1, 2024, at 10:15=E2=80=AFAM, Yuan Fu <casouri@HIDDEN> =
wrote:
>=20
>=20
>=20
>> On May 29, 2024, at 5:28=E2=80=AFAM, Eli Zaretskii <eliz@HIDDEN> =
wrote:
>>=20
>>> From: Yuan Fu <casouri@HIDDEN>
>>> Date: Tue, 28 May 2024 22:15:05 -0700
>>> Cc: Helmut Eller <eller.helmut@HIDDEN>,
>>> 71012 <at> debbugs.gnu.org
>>>=20
>>> =46rom what I can gather, the crash seems to be because the temp =
buffer is garbage collected=E2=80=94the inserted lisp.h is a large file, =
so the temp buffer is probably immediately collected, before Emacs tries =
to print the node in the next line. I replaced the insert-file-content =
with some smaller file and it didn=E2=80=99t crash.
>>=20
>> It is unthinkable that a buffer is GC'ed while it is being used.
>>=20
>>> But that theory has critical flaws: a) Emacs certainly doesn't =
collect the temp buffer before the with-temp-buffer form returns; b) I =
can=E2=80=99t crash Emacs in my non-debug build by inserting =
(garbage-collect) in front of the message line in the example; c) debug =
build Emacs still crashes even if I enlarge gc-cons-threshold.
>>>=20
>>> Eli, is there anything different regarding temp buffers in debug =
builds?
>>=20
>> No.
>>=20
>> But note that there are _two_ temporary buffers involved here: one is
>> created in ts-bug.el, and it remains intact and valid; the other is
>> the temporary buffer created by treesit-parse-string. That one is
>> killed by the time treesit-parse-string returns, so =
treesit-node-start
>> attempts to access positions of a killed buffer!
>>=20
>> So I think this is a bug in treesit-parse-string: it cannot use
>> with-temp-buffer; instead, it should make the buffer into which it
>> inserts the string part of the parser, so that the buffer is killed
>> and GC'ed only when the parser is no longer referenced. Otherwise =
the
>> syntax tree returned by treesit-parse-string is unsafe to use.
>=20
> I see, you=E2=80=99re absolutely right, thanks for the analysis! On =
top of that I need to make sure all the treesit function checks for =
buffer liveness before accessing the buffer. I was under the impression =
that a killed buffer would keep its content around until it=E2=80=99s =
collected. Turns out that wasn=E2=80=99t the case.
>=20
> Yuan
Pushed the fix to emacs-29.
Yuan
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Subject: bug#71012: closed (30.0.50; tree-sitter crash)
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Subject: 30.0.50; tree-sitter crash
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--=-=-=
Content-Type: text/plain
The code in the attached file tries to parse src/lisp.h but crashes
while printing the result: emacs --batch -l ts-bug.el
--=-=-=
Content-Type: application/emacs-lisp
Content-Disposition: attachment; filename=ts-bug.el
Content-Transfer-Encoding: quoted-printable
(require 'treesit)
(with-temp-buffer
(insert-file-contents "lisp.h")
(message "%s" (treesit-parse-string (buffer-string) 'c)))
--=-=-=
Content-Type: text/plain
Program received signal SIGSEGV, Segmentation fault.
0x000055555575c33a in buf_bytepos_to_charpos (b=0x555556074c60, bytepos=1)
at marker.c:343
343 eassert (bytepos >= BUF_Z_BYTE (b)
(gdb) ba 10
#0 0x000055555575c33a in buf_bytepos_to_charpos (b=0x555556074c60, bytepos=1)
at marker.c:343
#1 0x0000555555853509 in Ftreesit_node_start
(node=node@entry=XIL(0x55555605b225)) at treesit.c:1927
#2 0x00005555557f3f8a in print_vectorlike_unreadable
(obj=XIL(0x55555605b225), printcharfun=XIL(0), escapeflag=<optimized out>, buf=0x7fffffff7ef0 "dd\aVUU") at print.c:2051
#3 0x00005555557f1b85 in print_object
(obj=<optimized out>, printcharfun=<optimized out>, escapeflag=false)
at print.c:2642
#4 0x00005555557f2cf0 in Fprin1_to_string
(object=object@entry=XIL(0x55555605b225), noescape=XIL(0x30), overrides=overrides@entry=XIL(0)) at print.c:814
#5 0x00005555557b7c30 in styled_format
(nargs=2, args=args@entry=0x7fffffffda30, message=message@entry=true)
at editfns.c:3635
#6 0x00005555557b933f in Fformat_message
(args=0x7fffffffda30, nargs=<optimized out>) at editfns.c:3388
#7 Fmessage (args=0x7fffffffda30, nargs=<optimized out>) at editfns.c:3185
#8 Fmessage (nargs=<optimized out>, args=0x7fffffffda30) at editfns.c:3154
#9 0x00005555557c6b75 in eval_sub (form=<optimized out>)
at /scratch/emacs/emacs-git/src/lisp.h:2243
(More stack frames follow...)
In GNU Emacs 30.0.50 (build 6, x86_64-pc-linux-gnu, GTK+ Version
3.24.38, cairo version 1.16.0) of 2024-05-17 built on caladan
Repository revision: 6ca3a60db3427bc6aef08144c1524920ff3d9c4d
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101007
System Description: Debian GNU/Linux 12 (bookworm)
Configured using:
'configure --enable-checking --without-native-compiler
--with-xpm=ifavailable --with-gif=ifavailable
--with-native-compilation=no --with-tree-sitter'
Configured features:
CAIRO DBUS FREETYPE GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG LIBSELINUX
LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG SECCOMP SOUND
SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM
XINPUT2 GTK3 ZLIB
--=-=-=--
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Subject: Re: bug#71012: 30.0.50; tree-sitter crash
From: Yuan Fu <casouri@HIDDEN>
In-Reply-To: <DABEECD0-1B76-4450-B14F-4957FC4B017E@HIDDEN>
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To: Eli Zaretskii <eliz@HIDDEN>
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> On Jun 1, 2024, at 10:43=E2=80=AFAM, Yuan Fu <casouri@HIDDEN> =
wrote:
>=20
>=20
>=20
>> On Jun 1, 2024, at 10:15=E2=80=AFAM, Yuan Fu <casouri@HIDDEN> =
wrote:
>>=20
>>=20
>>=20
>>> On May 29, 2024, at 5:28=E2=80=AFAM, Eli Zaretskii <eliz@HIDDEN> =
wrote:
>>>=20
>>>> From: Yuan Fu <casouri@HIDDEN>
>>>> Date: Tue, 28 May 2024 22:15:05 -0700
>>>> Cc: Helmut Eller <eller.helmut@HIDDEN>,
>>>> 71012 <at> debbugs.gnu.org
>>>>=20
>>>> =46rom what I can gather, the crash seems to be because the temp =
buffer is garbage collected=E2=80=94the inserted lisp.h is a large file, =
so the temp buffer is probably immediately collected, before Emacs tries =
to print the node in the next line. I replaced the insert-file-content =
with some smaller file and it didn=E2=80=99t crash.
>>>=20
>>> It is unthinkable that a buffer is GC'ed while it is being used.
>>>=20
>>>> But that theory has critical flaws: a) Emacs certainly doesn't =
collect the temp buffer before the with-temp-buffer form returns; b) I =
can=E2=80=99t crash Emacs in my non-debug build by inserting =
(garbage-collect) in front of the message line in the example; c) debug =
build Emacs still crashes even if I enlarge gc-cons-threshold.
>>>>=20
>>>> Eli, is there anything different regarding temp buffers in debug =
builds?
>>>=20
>>> No.
>>>=20
>>> But note that there are _two_ temporary buffers involved here: one =
is
>>> created in ts-bug.el, and it remains intact and valid; the other is
>>> the temporary buffer created by treesit-parse-string. That one is
>>> killed by the time treesit-parse-string returns, so =
treesit-node-start
>>> attempts to access positions of a killed buffer!
>>>=20
>>> So I think this is a bug in treesit-parse-string: it cannot use
>>> with-temp-buffer; instead, it should make the buffer into which it
>>> inserts the string part of the parser, so that the buffer is killed
>>> and GC'ed only when the parser is no longer referenced. Otherwise =
the
>>> syntax tree returned by treesit-parse-string is unsafe to use.
>>=20
>> I see, you=E2=80=99re absolutely right, thanks for the analysis! On =
top of that I need to make sure all the treesit function checks for =
buffer liveness before accessing the buffer. I was under the impression =
that a killed buffer would keep its content around until it=E2=80=99s =
collected. Turns out that wasn=E2=80=99t the case.
>>=20
>> Yuan
>=20
> Pushed the fix to emacs-29.
>=20
> Yuan
>=20
The fix works for me so I=E2=80=99m closing this report. Feel free to =
followup if new problems occur :-)
Yuan
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To: Helmut Eller <eller.helmut@HIDDEN>
Subject: bug#71012: closed (Re: bug#71012: 30.0.50; tree-sitter crash)
Message-ID: <handler.71012.D71012.171765195828627.notifdone <at> debbugs.gnu.org>
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Your bug report
#71012: 30.0.50; tree-sitter crash
which was filed against the emacs package, has been closed.
The explanation is attached below, along with your original report.
If you require more details, please reply to 71012 <at> debbugs.gnu.org.
--=20
71012: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D71012
GNU Bug Tracking System
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Subject: Re: bug#71012: 30.0.50; tree-sitter crash
From: Yuan Fu <casouri@HIDDEN>
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<CA0E3316-8A35-4F3B-8E12-77F70AB96039@HIDDEN>
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> On Jun 1, 2024, at 10:43=E2=80=AFAM, Yuan Fu <casouri@HIDDEN> =
wrote:
>=20
>=20
>=20
>> On Jun 1, 2024, at 10:15=E2=80=AFAM, Yuan Fu <casouri@HIDDEN> =
wrote:
>>=20
>>=20
>>=20
>>> On May 29, 2024, at 5:28=E2=80=AFAM, Eli Zaretskii <eliz@HIDDEN> =
wrote:
>>>=20
>>>> From: Yuan Fu <casouri@HIDDEN>
>>>> Date: Tue, 28 May 2024 22:15:05 -0700
>>>> Cc: Helmut Eller <eller.helmut@HIDDEN>,
>>>> 71012 <at> debbugs.gnu.org
>>>>=20
>>>> =46rom what I can gather, the crash seems to be because the temp =
buffer is garbage collected=E2=80=94the inserted lisp.h is a large file, =
so the temp buffer is probably immediately collected, before Emacs tries =
to print the node in the next line. I replaced the insert-file-content =
with some smaller file and it didn=E2=80=99t crash.
>>>=20
>>> It is unthinkable that a buffer is GC'ed while it is being used.
>>>=20
>>>> But that theory has critical flaws: a) Emacs certainly doesn't =
collect the temp buffer before the with-temp-buffer form returns; b) I =
can=E2=80=99t crash Emacs in my non-debug build by inserting =
(garbage-collect) in front of the message line in the example; c) debug =
build Emacs still crashes even if I enlarge gc-cons-threshold.
>>>>=20
>>>> Eli, is there anything different regarding temp buffers in debug =
builds?
>>>=20
>>> No.
>>>=20
>>> But note that there are _two_ temporary buffers involved here: one =
is
>>> created in ts-bug.el, and it remains intact and valid; the other is
>>> the temporary buffer created by treesit-parse-string. That one is
>>> killed by the time treesit-parse-string returns, so =
treesit-node-start
>>> attempts to access positions of a killed buffer!
>>>=20
>>> So I think this is a bug in treesit-parse-string: it cannot use
>>> with-temp-buffer; instead, it should make the buffer into which it
>>> inserts the string part of the parser, so that the buffer is killed
>>> and GC'ed only when the parser is no longer referenced. Otherwise =
the
>>> syntax tree returned by treesit-parse-string is unsafe to use.
>>=20
>> I see, you=E2=80=99re absolutely right, thanks for the analysis! On =
top of that I need to make sure all the treesit function checks for =
buffer liveness before accessing the buffer. I was under the impression =
that a killed buffer would keep its content around until it=E2=80=99s =
collected. Turns out that wasn=E2=80=99t the case.
>>=20
>> Yuan
>=20
> Pushed the fix to emacs-29.
>=20
> Yuan
>=20
The fix works for me so I=E2=80=99m closing this report. Feel free to =
followup if new problems occur :-)
Yuan
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From: Helmut Eller <eller.helmut@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 30.0.50; tree-sitter crash
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--=-=-=
Content-Type: text/plain
The code in the attached file tries to parse src/lisp.h but crashes
while printing the result: emacs --batch -l ts-bug.el
--=-=-=
Content-Type: application/emacs-lisp
Content-Disposition: attachment; filename=ts-bug.el
Content-Transfer-Encoding: quoted-printable
(require 'treesit)
(with-temp-buffer
(insert-file-contents "lisp.h")
(message "%s" (treesit-parse-string (buffer-string) 'c)))
--=-=-=
Content-Type: text/plain
Program received signal SIGSEGV, Segmentation fault.
0x000055555575c33a in buf_bytepos_to_charpos (b=0x555556074c60, bytepos=1)
at marker.c:343
343 eassert (bytepos >= BUF_Z_BYTE (b)
(gdb) ba 10
#0 0x000055555575c33a in buf_bytepos_to_charpos (b=0x555556074c60, bytepos=1)
at marker.c:343
#1 0x0000555555853509 in Ftreesit_node_start
(node=node@entry=XIL(0x55555605b225)) at treesit.c:1927
#2 0x00005555557f3f8a in print_vectorlike_unreadable
(obj=XIL(0x55555605b225), printcharfun=XIL(0), escapeflag=<optimized out>, buf=0x7fffffff7ef0 "dd\aVUU") at print.c:2051
#3 0x00005555557f1b85 in print_object
(obj=<optimized out>, printcharfun=<optimized out>, escapeflag=false)
at print.c:2642
#4 0x00005555557f2cf0 in Fprin1_to_string
(object=object@entry=XIL(0x55555605b225), noescape=XIL(0x30), overrides=overrides@entry=XIL(0)) at print.c:814
#5 0x00005555557b7c30 in styled_format
(nargs=2, args=args@entry=0x7fffffffda30, message=message@entry=true)
at editfns.c:3635
#6 0x00005555557b933f in Fformat_message
(args=0x7fffffffda30, nargs=<optimized out>) at editfns.c:3388
#7 Fmessage (args=0x7fffffffda30, nargs=<optimized out>) at editfns.c:3185
#8 Fmessage (nargs=<optimized out>, args=0x7fffffffda30) at editfns.c:3154
#9 0x00005555557c6b75 in eval_sub (form=<optimized out>)
at /scratch/emacs/emacs-git/src/lisp.h:2243
(More stack frames follow...)
In GNU Emacs 30.0.50 (build 6, x86_64-pc-linux-gnu, GTK+ Version
3.24.38, cairo version 1.16.0) of 2024-05-17 built on caladan
Repository revision: 6ca3a60db3427bc6aef08144c1524920ff3d9c4d
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101007
System Description: Debian GNU/Linux 12 (bookworm)
Configured using:
'configure --enable-checking --without-native-compiler
--with-xpm=ifavailable --with-gif=ifavailable
--with-native-compilation=no --with-tree-sitter'
Configured features:
CAIRO DBUS FREETYPE GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG LIBSELINUX
LIBSYSTEMD LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG SECCOMP SOUND
SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM
XINPUT2 GTK3 ZLIB
--=-=-=--
------------=_1717651982-28674-1--
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From: "Basil L. Contovounesios" <basil@HIDDEN>
In-Reply-To: <792DB4FC-EB1E-4094-A4CF-14500DDA82C1@HIDDEN> (Yuan Fu's
message of "Wed, 5 Jun 2024 22:31:04 -0700")
References: <87ttiwpng0.fsf@HIDDEN> <86wmnsfodz.fsf@HIDDEN>
<CA0E3316-8A35-4F3B-8E12-77F70AB96039@HIDDEN>
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Date: Fri, 07 Jun 2024 10:39:27 +0200
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Just curious: since generate-new-buffer creates a new buffer each time
it is called, is it guaranteed that this buffer will eventually be GCed,
once the caller of treesit-parse-string is done with it?
Thanks,
--
Basil
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Subject: bug#71012: 30.0.50; tree-sitter crash
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From: "Basil L. Contovounesios" <basil@HIDDEN>
In-Reply-To: <87h6e52lkw.fsf@HIDDEN> (Basil L. Contovounesios's message of
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References: <87ttiwpng0.fsf@HIDDEN> <86wmnsfodz.fsf@HIDDEN>
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Date: Mon, 10 Jun 2024 10:12:51 +0200
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BTW, not sure if this is the right bug report, but currently on master I
see the following test failure:
make TEST_LOAD_EL=no test/treesit-tests
make -C test treesit-tests
make[1]: Entering directory '/home/blc/.local/src/emacs/test'
make[2]: Entering directory '/home/blc/.local/src/emacs/test'
GEN src/treesit-tests.log
Running 28 tests (2024-06-10 10:11:18+0200, selector `(not (or (tag :unstable) (tag :nativecomp)))')
passed 1/28 treesit-basic-parsing (0.000398 sec)
passed 2/28 treesit-cross-boundary (0.000307 sec)
passed 3/28 treesit-cursor-helper-with-missing-node (0.000217 sec)
Can't guess python-indent-offset, using defaults: 4
passed 4/28 treesit-defun-navigation-nested-1 (0.038371 sec)
passed 5/28 treesit-defun-navigation-nested-2 (0.058591 sec)
passed 6/28 treesit-defun-navigation-nested-3 (0.002775 sec)
passed 7/28 treesit-defun-navigation-nested-4 (0.003478 sec)
Can't guess python-indent-offset, using defaults: 4
passed 8/28 treesit-defun-navigation-top-level (0.003415 sec)
passed 9/28 treesit-indirect-buffer (0.000249 sec)
passed 10/28 treesit-multi-lang (0.000739 sec)
passed 11/28 treesit-narrow (0.000216 sec)
Test treesit-node-api backtrace:
make[2]: *** [Makefile:185: src/treesit-tests.log] Aborted (core dumped)
make[2]: Leaving directory '/home/blc/.local/src/emacs/test'
make[1]: *** [Makefile:251: src/treesit-tests] Error 2
make[1]: Leaving directory '/home/blc/.local/src/emacs/test'
make: *** [Makefile:1133: test/treesit-tests] Error 2
And no treesit-tests.log file is generated.
--
Basil
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Subject: bug#71012: 30.0.50; tree-sitter crash
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> Cc: 71012 <at> debbugs.gnu.org, eller.helmut@HIDDEN
> From: "Basil L. Contovounesios" <basil@HIDDEN>
> Date: Mon, 10 Jun 2024 10:12:51 +0200
>
> BTW, not sure if this is the right bug report, but currently on master I
> see the following test failure:
>
> make TEST_LOAD_EL=no test/treesit-tests
> make -C test treesit-tests
> make[1]: Entering directory '/home/blc/.local/src/emacs/test'
> make[2]: Entering directory '/home/blc/.local/src/emacs/test'
> GEN src/treesit-tests.log
> Running 28 tests (2024-06-10 10:11:18+0200, selector `(not (or (tag :unstable) (tag :nativecomp)))')
> passed 1/28 treesit-basic-parsing (0.000398 sec)
> passed 2/28 treesit-cross-boundary (0.000307 sec)
> passed 3/28 treesit-cursor-helper-with-missing-node (0.000217 sec)
> Can't guess python-indent-offset, using defaults: 4
> passed 4/28 treesit-defun-navigation-nested-1 (0.038371 sec)
> passed 5/28 treesit-defun-navigation-nested-2 (0.058591 sec)
> passed 6/28 treesit-defun-navigation-nested-3 (0.002775 sec)
> passed 7/28 treesit-defun-navigation-nested-4 (0.003478 sec)
> Can't guess python-indent-offset, using defaults: 4
> passed 8/28 treesit-defun-navigation-top-level (0.003415 sec)
> passed 9/28 treesit-indirect-buffer (0.000249 sec)
> passed 10/28 treesit-multi-lang (0.000739 sec)
> passed 11/28 treesit-narrow (0.000216 sec)
> Test treesit-node-api backtrace:
> make[2]: *** [Makefile:185: src/treesit-tests.log] Aborted (core dumped)
> make[2]: Leaving directory '/home/blc/.local/src/emacs/test'
> make[1]: *** [Makefile:251: src/treesit-tests] Error 2
> make[1]: Leaving directory '/home/blc/.local/src/emacs/test'
> make: *** [Makefile:1133: test/treesit-tests] Error 2
>
> And no treesit-tests.log file is generated.
Mattias fixed the crash, and I then fixed the test not to fail.
So I'm now closing this bug.
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> On Jun 7, 2024, at 1:39=E2=80=AFAM, Basil L. Contovounesios =
<basil@HIDDEN> wrote:
>=20
> Just curious: since generate-new-buffer creates a new buffer each time
> it is called, is it guaranteed that this buffer will eventually be =
GCed,
> once the caller of treesit-parse-string is done with it?
Yeah, from my testing that seems to be the case.
Yuan=
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> On Jun 10, 2024, at 11:25=E2=80=AFAM, Eli Zaretskii <eliz@HIDDEN> =
wrote:
>=20
>> Cc: 71012 <at> debbugs.gnu.org, eller.helmut@HIDDEN
>> From: "Basil L. Contovounesios" <basil@HIDDEN>
>> Date: Mon, 10 Jun 2024 10:12:51 +0200
>>=20
>> BTW, not sure if this is the right bug report, but currently on =
master I
>> see the following test failure:
>>=20
>> make TEST_LOAD_EL=3Dno test/treesit-tests
>> make -C test treesit-tests
>> make[1]: Entering directory '/home/blc/.local/src/emacs/test'
>> make[2]: Entering directory '/home/blc/.local/src/emacs/test'
>> GEN src/treesit-tests.log
>> Running 28 tests (2024-06-10 10:11:18+0200, selector `(not (or (tag =
:unstable) (tag :nativecomp)))')
>> passed 1/28 treesit-basic-parsing (0.000398 sec)
>> passed 2/28 treesit-cross-boundary (0.000307 sec)
>> passed 3/28 treesit-cursor-helper-with-missing-node (0.000217 =
sec)
>> Can't guess python-indent-offset, using defaults: 4
>> passed 4/28 treesit-defun-navigation-nested-1 (0.038371 sec)
>> passed 5/28 treesit-defun-navigation-nested-2 (0.058591 sec)
>> passed 6/28 treesit-defun-navigation-nested-3 (0.002775 sec)
>> passed 7/28 treesit-defun-navigation-nested-4 (0.003478 sec)
>> Can't guess python-indent-offset, using defaults: 4
>> passed 8/28 treesit-defun-navigation-top-level (0.003415 sec)
>> passed 9/28 treesit-indirect-buffer (0.000249 sec)
>> passed 10/28 treesit-multi-lang (0.000739 sec)
>> passed 11/28 treesit-narrow (0.000216 sec)
>> Test treesit-node-api backtrace:
>> make[2]: *** [Makefile:185: src/treesit-tests.log] Aborted (core =
dumped)
>> make[2]: Leaving directory '/home/blc/.local/src/emacs/test'
>> make[1]: *** [Makefile:251: src/treesit-tests] Error 2
>> make[1]: Leaving directory '/home/blc/.local/src/emacs/test'
>> make: *** [Makefile:1133: test/treesit-tests] Error 2
>>=20
>> And no treesit-tests.log file is generated.
>=20
> Mattias fixed the crash, and I then fixed the test not to fail.
>=20
> So I'm now closing this bug.
Thank you!
Yuan
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Subject: bug#71012: 30.0.50; tree-sitter crash
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Date: Thu, 13 Jun 2024 13:43:23 +0200
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Yuan Fu [2024-06-11 22:38 -0700] wrote:
>> On Jun 7, 2024, at 1:39=E2=80=AFAM, Basil L. Contovounesios <basil@conto=
vou.net> wrote:
>>=20
>> Just curious: since generate-new-buffer creates a new buffer each time
>> it is called, is it guaranteed that this buffer will eventually be GCed,
>> once the caller of treesit-parse-string is done with it?
>
> Yeah, from my testing that seems to be the case.
What did you try?
I'm putting the following in an emacs -Q *scratch* buffer:
(require 'treesit)
(message "# of buffers before : %d" (length (buffer-list)))
(dotimes-with-progress-reporter (i 10000) "Parsing"
(treesit-parse-string "int c =3D 0;" 'c))
(garbage-collect)
(message "# of buffers after : %d" (length (buffer-list)))
Each time I M-x eval-buffer:
- the list of buffers grows
- the memory usage grows
- loop iterations slow down noticeably
Am I missing something?
--=20
Basil
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By the way, this shouldn't make a big difference by default, but did you
consider calling generate-new-buffer with a non-nil optional argument (=C3=
=A0
la with-temp-buffer) in treesit-parse-string?
--=20
Basil
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From: "Basil L. Contovounesios" <basil@HIDDEN>
In-Reply-To: <87r0d12hlw.fsf@HIDDEN> (Basil L. Contovounesios's message of
"Thu, 13 Jun 2024 13:43:23 +0200")
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Date: Wed, 24 Jul 2024 16:57:53 +0200
Message-ID: <87y15qrg5q.fsf@HIDDEN>
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Ping: thoughts on whether this is an issue?
Basil L. Contovounesios [2024-06-13 13:43 +0200] wrote:
> Yuan Fu [2024-06-11 22:38 -0700] wrote:
>>> On Jun 7, 2024, at 1:39=E2=80=AFAM, Basil L. Contovounesios <basil@cont=
ovou.net> wrote:
>>>=20
>>> Just curious: since generate-new-buffer creates a new buffer each time
>>> it is called, is it guaranteed that this buffer will eventually be GCed,
>>> once the caller of treesit-parse-string is done with it?
>>
>> Yeah, from my testing that seems to be the case.
>
> What did you try?
> I'm putting the following in an emacs -Q *scratch* buffer:
>
> (require 'treesit)
> (message "# of buffers before : %d" (length (buffer-list)))
> (dotimes-with-progress-reporter (i 10000) "Parsing"
> (treesit-parse-string "int c =3D 0;" 'c))
> (garbage-collect)
> (message "# of buffers after : %d" (length (buffer-list)))
>
> Each time I M-x eval-buffer:
> - the list of buffers grows
> - the memory usage grows
> - loop iterations slow down noticeably
>
> Am I missing something?
Thanks,
--=20
Basil
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