GNU bug report logs - #70948
29.3; cperl mode hangs on comments like "#___"

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Package: emacs; Reported by: Patrick Goldmann <patrick.goldmann@HIDDEN>; Owned by: Harald Jörg <haj@HIDDEN>; Keywords: confirmed; dated Tue, 14 May 2024 16:58:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Owner recorded as Harald Jörg <haj@HIDDEN>. Request was from Harald Jörg <haj@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Added tag(s) confirmed. Request was from Harald Jörg <haj@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: =?utf-8?Q?Harald_J=C3=B6rg?= <haj@HIDDEN>
To: Patrick Goldmann <patrick.goldmann@HIDDEN>
Subject: Re: bug#70948: 29.3; cperl mode hangs on comments like "#___"
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 (Patrick Goldmann's message of "Tue, 14 May 2024 21:38:22 +0200")
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tags 70948 confirmed
owner 70948 !
thanks

Patrick Goldmann <patrick.goldmann@HIDDEN> writes:

> This was bugging me, so I played around with it a bit more.
>
> It seems this has nothing to do at all with version control etc, but
> with the number of underscores.
>
> I could reproduce it on my private machine with a clean emacs 29.3 install by:
> - C-x C-f foo.pl
> - M-x cperl-mode
> - just keeping underscore pressed

Ok, I can reproduce it:  I see a delay starting after ~20 underscores
and getting quickly worse as more underscores are added.  My first bet
would be some exponential regexp backtracking.

The slowdown does not happen with Emacs built from the repository under
Linux, nor with Emacs 28.2 under Windows.  I need to run more variations
to narrow it down.
--
Cheers,
haj




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#70948; Package emacs. Full text available.

Message received at 70948 <at> debbugs.gnu.org:


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From: Patrick Goldmann <patrick.goldmann@HIDDEN>
Date: Tue, 14 May 2024 21:38:22 +0200
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Subject: Re: bug#70948: 29.3; cperl mode hangs on comments like "#___"
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This was bugging me, so I played around with it a bit more.

It seems this has nothing to do at all with version control etc, but with
the number of underscores.

I could reproduce it on my private machine with a clean emacs 29.3 install
by:
- C-x C-f foo.pl
- M-x cperl-mode
- just keeping underscore pressed

Emacs will slow down eventually and then hang. Haven't waited long enough
to see if it recovers.

Hope this helps.

On Tue, May 14, 2024 at 8:46=E2=80=AFPM Patrick Goldmann <patrick.goldmann@=
gmail.com>
wrote:

> Just got home and tried to reproduce this on my private machine, it worke=
d
> just fine.
>
> So I guess this is something on my work machine, maybe version control
> related or something.
> Still strange this happened while running emacs -Q.
>
> I can try your file tomorrow, but my guess is if I drop this into one of
> my project directories it won't work.
> I'll try it outside of version controlled directories, too, and provide a=
n
> example file.
>
> But if it turns out this is somehow related to version control or
> something else in my project tree, this will be hard to debug and might n=
ot
> even be directly related to cperl-mode at all :(
>
> On Tue, May 14, 2024 at 8:20=E2=80=AFPM Harald J=C3=B6rg <haj@HIDDEN> =
wrote:
>
>> Patrick Goldmann <patrick.goldmann@HIDDEN> writes:
>>
>> > While trying to open files (with cperl-mode, perl-mode works)
>> > containing comments of this sort, emacs hangs.
>>
>> Unfortunately I can not reproduce this.  I tried on Windows with exactly
>> the same Emacs version with the attached file, and it works as expected.
>>
>> Can you pleas try this file, and provide a file where Emacs hanvs?
>> --
>> Cheers,
>> haj
>>
>>

--000000000000acedbf06186f2561
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<div dir=3D"ltr"><div>This was bugging me, so I played around with it a bit=
 more.</div><div><br></div><div>It seems this has nothing to do at all with=
 version control etc, but with the number of underscores.</div><div><br></d=
iv><div>I could reproduce it on my private machine with a clean emacs 29.3 =
install by:</div><div>- C-x C-f <a href=3D"http://foo.pl">foo.pl</a></div><=
div>- M-x cperl-mode</div><div>- just keeping underscore pressed</div><div>=
<br></div><div>Emacs will slow down eventually and then hang. Haven&#39;t w=
aited long enough to see if it recovers.</div><div><br></div><div>Hope this=
 helps.<br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" clas=
s=3D"gmail_attr">On Tue, May 14, 2024 at 8:46=E2=80=AFPM Patrick Goldmann &=
lt;<a href=3D"mailto:patrick.goldmann@HIDDEN">patrick.goldmann@HIDDEN=
</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:=
0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">=
<div dir=3D"ltr"><div>Just got home and tried to reproduce this on my priva=
te machine, it worked just fine.</div><div><br></div><div>So I guess this i=
s something on my work machine, maybe version control related or something.=
</div><div>Still strange this happened while running emacs -Q.<br></div><di=
v><br></div><div>I can try your file tomorrow, but my guess is if I drop th=
is into one of my project directories it won&#39;t work.<br></div><div>I&#3=
9;ll try it outside of version controlled directories, too, and provide an =
example file.</div><div><br></div><div>But if it turns out this is somehow =
related to version control or something else in my project tree, this will =
be hard to debug and might not even be directly related to cperl-mode at al=
l :(<br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Tue, May 14, 2024 at 8:20=E2=80=AFPM Harald J=C3=B6rg &l=
t;<a href=3D"mailto:haj@HIDDEN" target=3D"_blank">haj@HIDDEN</a>&gt; =
wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0=
px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Patrick G=
oldmann &lt;<a href=3D"mailto:patrick.goldmann@HIDDEN" target=3D"_blank"=
>patrick.goldmann@HIDDEN</a>&gt; writes:<br>
<br>
&gt; While trying to open files (with cperl-mode, perl-mode works)<br>
&gt; containing comments of this sort, emacs hangs.<br>
<br>
Unfortunately I can not reproduce this.=C2=A0 I tried on Windows with exact=
ly<br>
the same Emacs version with the attached file, and it works as expected.<br=
>
<br>
Can you pleas try this file, and provide a file where Emacs hanvs?<br>
--<br>
Cheers,<br>
haj<br>
<br>
</blockquote></div>
</blockquote></div>

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Information forwarded to bug-gnu-emacs@HIDDEN:
bug#70948; Package emacs. Full text available.

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From: Patrick Goldmann <patrick.goldmann@HIDDEN>
Date: Tue, 14 May 2024 20:46:53 +0200
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Subject: Re: bug#70948: 29.3; cperl mode hangs on comments like "#___"
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--0000000000008ad44706186e6d57
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

Just got home and tried to reproduce this on my private machine, it worked
just fine.

So I guess this is something on my work machine, maybe version control
related or something.
Still strange this happened while running emacs -Q.

I can try your file tomorrow, but my guess is if I drop this into one of my
project directories it won't work.
I'll try it outside of version controlled directories, too, and provide an
example file.

But if it turns out this is somehow related to version control or something
else in my project tree, this will be hard to debug and might not even be
directly related to cperl-mode at all :(

On Tue, May 14, 2024 at 8:20=E2=80=AFPM Harald J=C3=B6rg <haj@HIDDEN> wr=
ote:

> Patrick Goldmann <patrick.goldmann@HIDDEN> writes:
>
> > While trying to open files (with cperl-mode, perl-mode works)
> > containing comments of this sort, emacs hangs.
>
> Unfortunately I can not reproduce this.  I tried on Windows with exactly
> the same Emacs version with the attached file, and it works as expected.
>
> Can you pleas try this file, and provide a file where Emacs hanvs?
> --
> Cheers,
> haj
>
>

--0000000000008ad44706186e6d57
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Just got home and tried to reproduce this on my priva=
te machine, it worked just fine.</div><div><br></div><div>So I guess this i=
s something on my work machine, maybe version control related or something.=
</div><div>Still strange this happened while running emacs -Q.<br></div><di=
v><br></div><div>I can try your file tomorrow, but my guess is if I drop th=
is into one of my project directories it won&#39;t work.<br></div><div>I&#3=
9;ll try it outside of version controlled directories, too, and provide an =
example file.</div><div><br></div><div>But if it turns out this is somehow =
related to version control or something else in my project tree, this will =
be hard to debug and might not even be directly related to cperl-mode at al=
l :(<br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Tue, May 14, 2024 at 8:20=E2=80=AFPM Harald J=C3=B6rg &l=
t;<a href=3D"mailto:haj@HIDDEN">haj@HIDDEN</a>&gt; wrote:<br></div><b=
lockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-le=
ft:1px solid rgb(204,204,204);padding-left:1ex">Patrick Goldmann &lt;<a hre=
f=3D"mailto:patrick.goldmann@HIDDEN" target=3D"_blank">patrick.goldmann@=
gmail.com</a>&gt; writes:<br>
<br>
&gt; While trying to open files (with cperl-mode, perl-mode works)<br>
&gt; containing comments of this sort, emacs hangs.<br>
<br>
Unfortunately I can not reproduce this.=C2=A0 I tried on Windows with exact=
ly<br>
the same Emacs version with the attached file, and it works as expected.<br=
>
<br>
Can you pleas try this file, and provide a file where Emacs hanvs?<br>
--<br>
Cheers,<br>
haj<br>
<br>
</blockquote></div>

--0000000000008ad44706186e6d57--




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#70948; Package emacs. Full text available.

Message received at 70948 <at> debbugs.gnu.org:


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From: =?utf-8?Q?Harald_J=C3=B6rg?= <haj@HIDDEN>
To: Patrick Goldmann <patrick.goldmann@HIDDEN>
Subject: Re: bug#70948: 29.3; cperl mode hangs on comments like "#___"
In-Reply-To: <CAMQVTgXZQay+Tmbt+jTwichXVQ6s5mkJGjnSOeDi+a3nDFMrwg@HIDDEN>
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--=-=-=
Content-Type: text/plain

Patrick Goldmann <patrick.goldmann@HIDDEN> writes:

> While trying to open files (with cperl-mode, perl-mode works)
> containing comments of this sort, emacs hangs.

Unfortunately I can not reproduce this.  I tried on Windows with exactly
the same Emacs version with the attached file, and it works as expected.

Can you pleas try this file, and provide a file where Emacs hanvs?
--
Cheers,
haj


--=-=-=
Content-Type: text/plain
Content-Disposition: attachment; filename=comment.pl
Content-Description: Test with #___ comments

#___ A comment with underscores

package Strange;

#___ Another comment with underscores

--=-=-=--




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#70948; Package emacs. Full text available.

Message received at 70948 <at> debbugs.gnu.org:


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 (message from Patrick Goldmann on Tue, 14 May 2024 18:35:48 +0200)
Subject: Re: bug#70948: 29.3; cperl mode hangs on comments like "#___"
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> From: Patrick Goldmann <patrick.goldmann@HIDDEN>
> Date: Tue, 14 May 2024 18:35:48 +0200
> 
> While trying to open files (with cperl-mode, perl-mode works) containing comments of this sort, emacs hangs.
> 
> This also occurs when editing a new file in cperl-mode and trying to input a comment like that.
> 
> Verified it's not my ~/.emacs.d/ by running emacs -Q
> 
> I guess cperl-mode is mistaking this for something like __PACKAGE__ etc

Can you please show an example of such a file?  I tried to reproduce,
perhaps too naïvely, and failed to see Emacs hang.

Thanks.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#70948; Package emacs. Full text available.

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--000000000000aceff906186c987e
Content-Type: text/plain; charset="UTF-8"

While trying to open files (with cperl-mode, perl-mode works) containing
comments of this sort, emacs hangs.

This also occurs when editing a new file in cperl-mode and trying to input
a comment like that.

Verified it's not my ~/.emacs.d/ by running emacs -Q

I guess cperl-mode is mistaking this for something like __PACKAGE__ etc


In GNU Emacs 29.3 (build 2, x86_64-w64-mingw32) of 2024-03-24 built on
 AVALON
Windowing system distributor 'Microsoft Corp.', version 10.0.22631
System Description: Microsoft Windows 10 Pro (v10.0.2009.22631.3447)

Configured using:
 'configure --with-modules --without-dbus --with-native-compilation=aot
 --without-compress-install --with-sqlite3 --with-tree-sitter
 CFLAGS=-O2'

Configured features:
ACL GIF GMP GNUTLS HARFBUZZ JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY W32NOTIFY PDUMPER PNG RSVG SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XPM ZLIB

(NATIVE_COMP present but libgccjit not available)

Important settings:
  value of $LANG: DEU
  locale-coding-system: cp1252

Major mode: Lisp Interaction

Minor modes in effect:
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  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
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
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dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
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cyrillic chinese composite emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button
loaddefs theme-loaddefs faces cus-face macroexp files window
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget keymap hashtable-print-readable backquote threads
w32notify w32 lcms2 multi-tty make-network-process native-compile emacs)

Memory information:
((conses 16 50309 9400)
 (symbols 48 5188 0)
 (strings 32 15119 1435)
 (string-bytes 1 415182)
 (vectors 16 11033)
 (vector-slots 8 262420 20014)
 (floats 8 24 38)
 (intervals 56 237 0)
 (buffers 984 10))

--000000000000aceff906186c987e
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">While trying to open files (with cperl-mode, perl-mode wor=
ks) containing comments of this sort, emacs hangs.<div><br></div><div>This =
also occurs when editing a new file in cperl-mode and trying to input a com=
ment like that.</div><div><br></div><div>Verified it&#39;s not my ~/.emacs.=
d/ by running emacs -Q<br></div><div><br></div><div>I guess cperl-mode is m=
istaking this for something like __PACKAGE__ etc<br></div><div><br></div><d=
iv><br></div><div>In GNU Emacs 29.3 (build 2, x86_64-w64-mingw32) of 2024-0=
3-24 built on</div>=C2=A0AVALON<br>Windowing system distributor &#39;Micros=
oft Corp.&#39;, version 10.0.22631<br>System Description: Microsoft Windows=
 10 Pro (v10.0.2009.22631.3447)<br><br>Configured using:<br>=C2=A0&#39;conf=
igure --with-modules --without-dbus --with-native-compilation=3Daot<br>=C2=
=A0--without-compress-install --with-sqlite3 --with-tree-sitter<br>=C2=A0CF=
LAGS=3D-O2&#39;<br><br>Configured features:<br>ACL GIF GMP GNUTLS HARFBUZZ =
JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP<br>NOTIFY W32NOTIFY PDUMPER PNG=
 RSVG SOUND SQLITE3 THREADS TIFF<br>TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XP=
M ZLIB<br><br>(NATIVE_COMP present but libgccjit not available)<br><br>Impo=
rtant settings:<br>=C2=A0 value of $LANG: DEU<br>=C2=A0 locale-coding-syste=
m: cp1252<br><br>Major mode: Lisp Interaction<br><br>Minor modes in effect:=
<br>=C2=A0 tooltip-mode: t<br>=C2=A0 global-eldoc-mode: t<br>=C2=A0 eldoc-m=
ode: t<br>=C2=A0 show-paren-mode: t<br>=C2=A0 electric-indent-mode: t<br>=
=C2=A0 mouse-wheel-mode: t<br>=C2=A0 tool-bar-mode: t<br>=C2=A0 menu-bar-mo=
de: t<br>=C2=A0 file-name-shadow-mode: t<br>=C2=A0 global-font-lock-mode: t=
<br>=C2=A0 font-lock-mode: t<br>=C2=A0 blink-cursor-mode: t<br>=C2=A0 line-=
number-mode: t<br>=C2=A0 indent-tabs-mode: t<br>=C2=A0 transient-mark-mode:=
 t<br>=C2=A0 auto-composition-mode: t<br>=C2=A0 auto-encryption-mode: t<br>=
=C2=A0 auto-compression-mode: t<br><br>Load-path shadows:<br>None found.<br=
><br>Features:<br>(shadow sort mail-extr emacsbug message mailcap yank-medi=
a puny dired<br>dired-loaddefs rfc822 mml mml-sec password-cache epa derive=
d epg rfc6068<br>epg-config gnus-util text-property-search time-date subr-x=
 mm-decode<br>mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils m=
ailheader<br>cl-loaddefs cl-lib sendmail rfc2047 rfc2045 ietf-drums mm-util=
<br>mail-prsvr mail-utils rmc iso-transl tooltip cconv eldoc paren electric=
<br>uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel dos-w32<=
br>ls-lisp disp-table term/w32-win w32-win w32-vars term/common-win<br>tool=
-bar dnd fontset image regexp-opt fringe tabulated-list replace<br>newcomme=
nt text-mode lisp-mode prog-mode register page tab-bar menu-bar<br>rfn-esha=
dow isearch easymenu timer select scroll-bar mouse jit-lock<br>font-lock sy=
ntax font-core term/tty-colors frame minibuffer nadvice seq<br>simple cl-ge=
neric indonesian philippine cham georgian utf-8-lang<br>misc-lang vietnames=
e tibetan thai tai-viet lao korean japanese eucjp-ms<br>cp51932 hebrew gree=
k romanian slovak czech european ethiopic indian<br>cyrillic chinese compos=
ite emoji-zwj charscript charprop case-table<br>epa-hook jka-cmpr-hook help=
 abbrev obarray oclosure cl-preloaded button<br>loaddefs theme-loaddefs fac=
es cus-face macroexp files window<br>text-properties overlay sha1 md5 base6=
4 format env code-pages mule<br>custom widget keymap hashtable-print-readab=
le backquote threads<br>w32notify w32 lcms2 multi-tty make-network-process =
native-compile emacs)<br><br>Memory information:<br>((conses 16 50309 9400)=
<br>=C2=A0(symbols 48 5188 0)<br>=C2=A0(strings 32 15119 1435)<br>=C2=A0(st=
ring-bytes 1 415182)<br>=C2=A0(vectors 16 11033)<br>=C2=A0(vector-slots 8 2=
62420 20014)<br>=C2=A0(floats 8 24 38)<br>=C2=A0(intervals 56 237 0)<br>=C2=
=A0(buffers 984 10))<br></div>

--000000000000aceff906186c987e--




Acknowledgement sent to Patrick Goldmann <patrick.goldmann@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#70948; Package emacs. Full text available.
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Last modified: Tue, 14 May 2024 22:45:01 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.