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From: Stefan Monnier <monnier@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#72977: 28.2; DOS in Shell-script mode
In-Reply-To: <861q227yl3.fsf@HIDDEN> (Eli Zaretskii's message of "Mon, 02 Sep
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<861q227yl3.fsf@HIDDEN>
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>> echo in in in in in in in in in in in in in in in in in in in in in in i=
n in in in in in in in
>>=20
>> After about 20 'in's, things slow down noticeably, and I can't get to 30=
without it hanging.
>
> The profile is below. Maybe Stefan (CC'ed) has some comments or
> suggestions.
>
> 36361 58% - timer-event-handler
> 36361 58% - apply
> 36361 58% - show-paren-function
> 36361 58% - #<advice 1DA>
> 36361 58% - apply
> 36361 58% - smie--matching-block-data
> 36359 58% - smie--opener/closer-at-point
> 36068 57% - sh-smie-sh-forward-token
> 23841 38% - sh-smie--sh-keyword-p
> 23841 38% - sh-smie--sh-keyword-in/do-p
> 23841 38% - sh-smie-sh-backward-token
> 23837 38% - sh-smie--sh-keyword-p
> 23837 38% - sh-smie--sh-keyword-in/do-p
> 23837 38% - sh-smie-sh-backward-token
> 23805 38% - sh-smie--sh-keyword-p
> 23801 38% - sh-smie--sh-keyword-in/do-p
> 23793 38% - sh-smie-sh-backward-token
> 23685 38% - sh-smie--sh-keyword-p
[...]
Hmm... indeed, in order to decide whether a given `in` is a keyword
rather than just some command's argument, we need to look back, so we
probably have an O(N=B2) situation here, where we walk backward over all
the `in`s in order to decide whether the last one is a keyword. Then we
do the same starting from the "last but one" (because the check for
keyword-p was only made to decide how to skip that last token), etc...
In theory we could do it more efficiently by integrating better the
keyword-p check and the navigation to the beginning of a command, but it
requires a different structure than the one we're using.
Another solution is to use a cache (which could simply memoize the
output of `sh-smie--sh-keyword-p`) which we could flush from
`after-change-functions`.
Yet another (more ad-hoc) approach might be to try and keep track of the
nesting, and let `sh-smie--sh-keyword-p` return nil when we reach
a nesting of say 2 (at least for `in` I can't think of a piece of code
where the 3rd (or subsequent) `in` can be a keyword).
Stefan
bug-gnu-emacs@HIDDEN:bug#72977; Package emacs.
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To: Chris Moore <christopher.ian.moore@HIDDEN>,
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In-Reply-To: <CAMN9hAV3tzuvAh9ZvZWFB4jDZxjbRAyZ8no8u_0tVknSBWLKMA@HIDDEN>
(message from Chris Moore on Mon, 2 Sep 2024 12:35:18 -0300)
Subject: Re: bug#72977: 28.2; DOS in Shell-script mode
References: <CAMN9hAV3tzuvAh9ZvZWFB4jDZxjbRAyZ8no8u_0tVknSBWLKMA@HIDDEN>
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> From: Chris Moore <christopher.ian.moore@HIDDEN>
> Date: Mon, 2 Sep 2024 12:35:18 -0300
>
> I've been seeing Emacs hang up repeatedly for no apparent reason recently while editing shell scripts. I spent
> the time to isolate the issue. It turns out that I can reproduce the issue by opening a new shell script file and
> typing the word "in" 20 or 30 times on a single line:
>
> $ emacs -Q
> C-x C-f /tmp/x.sh
> echo in in in in in in in in in in in in in in in in in in in in in in in in in in in in in in
>
> After about 20 'in's, things slow down noticeably, and I can't get to 30 without it hanging.
The profile is below. Maybe Stefan (CC'ed) has some comments or
suggestions.
36361 58% - timer-event-handler
36361 58% - apply
36361 58% - show-paren-function
36361 58% - #<advice 1DA>
36361 58% - apply
36361 58% - smie--matching-block-data
36359 58% - smie--opener/closer-at-point
36068 57% - sh-smie-sh-forward-token
23841 38% - sh-smie--sh-keyword-p
23841 38% - sh-smie--sh-keyword-in/do-p
23841 38% - sh-smie-sh-backward-token
23837 38% - sh-smie--sh-keyword-p
23837 38% - sh-smie--sh-keyword-in/do-p
23837 38% - sh-smie-sh-backward-token
23805 38% - sh-smie--sh-keyword-p
23801 38% - sh-smie--sh-keyword-in/do-p
23793 38% - sh-smie-sh-backward-token
23685 38% - sh-smie--sh-keyword-p
23681 38% - sh-smie--sh-keyword-in/do-p
23665 37% - sh-smie-sh-backward-token
23425 37% - sh-smie--sh-keyword-p
23409 37% - sh-smie--sh-keyword-in/do-p
23349 37% - sh-smie-sh-backward-token
13623 21% looking-back
6152 9% sh-smie--default-backward-token
3368 5% - sh-smie--sh-keyword-p
1655 2% sh-smie--sh-keyword-in/do-p
28 0% assoc
136 0% looking-back
44 0% sh-smie--default-backward-token
8 0% assoc
64 0% looking-back
20 0% sh-smie--default-backward-token
4 0% assoc
16 0% sh-smie--default-backward-token
8 0% looking-back
4 0% sh-smie--default-backward-token
12227 19% - sh-smie--newline-semi-p
12227 19% - sh-smie-sh-backward-token
12227 19% - sh-smie--sh-keyword-p
12227 19% - sh-smie--sh-keyword-in/do-p
12227 19% - sh-smie-sh-backward-token
12227 19% - sh-smie--sh-keyword-p
12227 19% - sh-smie--sh-keyword-in/do-p
12227 19% - sh-smie-sh-backward-token
12223 19% - sh-smie--sh-keyword-p
12223 19% - sh-smie--sh-keyword-in/do-p
12223 19% - sh-smie-sh-backward-token
12203 19% - sh-smie--sh-keyword-p
12203 19% - sh-smie--sh-keyword-in/do-p
12199 19% - sh-smie-sh-backward-token
12143 19% - sh-smie--sh-keyword-p
12143 19% - sh-smie--sh-keyword-in/do-p
10012 16% sh-smie-sh-backward-token
2119 3% assoc
36 0% looking-back
[...]
25633 41% Automatic GC
bug-gnu-emacs@HIDDEN:bug#72977; Package emacs.
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I spent the time to isolate the issue. It turns out that I can reproduce the issue by opening a new shell script file and typing the word "in" 20 or 30 times on a single line: $ emacs -Q C-x C-f /tmp/x.sh echo in in in in in in in in in in in in in in in in in in in in in in in in in in in in in in After about 20 'in's, things slow down noticeably, and I can't get to 30 without it hanging. I fixed the issue by replacing "in" with "'in'" in my script. In GNU Emacs 28.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.38, cairo version 1.16.0) of 2024-06-25, modified by Debian built on x86-conova-01 System Description: Debian GNU/Linux 12 (bookworm) Configured using: 'configure --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/libexec --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --with-libsystemd --with-pop=yes --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/28.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/28.2/site-lisp:/usr/share/emacs/site-lisp --with-sound=alsa --without-gconf --with-mailutils --with-native-compilation --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/libexec --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --with-libsystemd --with-pop=yes --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/28.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/28.2/site-lisp:/usr/share/emacs/site-lisp --with-sound=alsa --without-gconf --with-mailutils --with-native-compilation --with-cairo --with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars 'CFLAGS=-g -O2 -ffile-prefix-map=/build/reproducible-path/emacs-28.2+1=. -fstack-protector-strong -Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro' 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 THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK3 ZLIB Important settings: value of $LANG: en_CA.UTF-8 locale-coding-system: utf-8-unix Major mode: Shell-script Minor modes in effect: sh-electric-here-document-mode: t display-time-mode: t global-so-long-mode: t shell-dirtrack-mode: t tooltip-mode: t global-eldoc-mode: t show-paren-mode: t mouse-wheel-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t column-number-mode: t line-number-mode: t transient-mark-mode: t Load-path shadows: None found. Features: (shadow sort mail-extr emacsbug message rmc puny rfc822 mml mml-sec epa derived epg rfc6068 epg-config gnus-util rmail rmail-loaddefs time-date mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail comp comp-cstr warnings cl-extra help-mode rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils sh-script smie executable dired-aux term/screen term/xterm xterm cus-edit pp cus-start wid-edit ido time cus-load wdired dired dired-loaddefs so-long shell pcomplete rust-utils thingatpt rust-mode rx rust-rustfmt rust-playpen rust-compile compile text-property-search comint ansi-color ring rust-cargo finder-inf package browse-url url url-proxy url-privacy url-expand url-methods url-history url-cookie url-domsuf url-util mailcap url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs password-cache json subr-x map url-vars seq byte-opt gv bytecomp byte-compile cconv cl-loaddefs cl-lib iso-transl tooltip eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list replace newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock font-lock syntax font-core term/tty-colors frame minibuffer cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese composite emoji-zwj charscript charprop case-table epa-hook jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice button loaddefs faces cus-face macroexp files window text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote threads dbusbind inotify lcms2 dynamic-setting system-font-setting font-render-setting cairo move-toolbar gtk x-toolkit x multi-tty make-network-process native-compile emacs) Memory information: ((conses 16 199366 8596) (symbols 48 13308 1) (strings 32 65460 2058) (string-bytes 1 1538163) (vectors 16 22561) (vector-slots 8 424286 17680) (floats 8 62 347) (intervals 56 1790 178) (buffers 992 17)) --0000000000004fc489062124b2d7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div>I've been seeing Emacs hang up repeatedly for no = apparent reason recently while editing shell scripts. I spent the time to i= solate the issue. It turns out that I can reproduce the issue by opening a = new shell script file and typing the word "in" 20 or 30 times on = a single line:</div><div><br></div><div style=3D"margin-left:40px"><span st= yle=3D"font-family:monospace">$ emacs -Q<br>C-x C-f /tmp/x.sh<br>echo in in= in in in in in in in in in in in in in in in in in in in in in in in in in= in in in</span></div><div><br></div><div>After about 20 'in's, thi= ngs slow down noticeably, and I can't get to 30 without it hanging.</di= v><div><br></div><div>I fixed the issue by replacing "in" with &q= uot;'in'" in my script.</div><div><br></div><div><br></div><di= v>In GNU Emacs 28.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.38, ca= iro version 1.16.0)</div>=C2=A0of 2024-06-25, modified by Debian built on x= 86-conova-01<br>System Description: Debian GNU/Linux 12 (bookworm)<br><br>C= onfigured using:<br>=C2=A0'configure --build x86_64-linux-gnu --prefix= =3D/usr<br>=C2=A0--sharedstatedir=3D/var/lib --libexecdir=3D/usr/libexec<br= >=C2=A0--localstatedir=3D/var/lib --infodir=3D/usr/share/info<br>=C2=A0--ma= ndir=3D/usr/share/man --with-libsystemd --with-pop=3Dyes<br>=C2=A0--enable-= locallisppath=3D/etc/emacs:/usr/local/share/emacs/28.2/site-lisp:/usr/local= /share/emacs/site-lisp:/usr/share/emacs/28.2/site-lisp:/usr/share/emacs/sit= e-lisp<br>=C2=A0--with-sound=3Dalsa --without-gconf --with-mailutils<br>=C2= =A0--with-native-compilation --build x86_64-linux-gnu --prefix=3D/usr<br>= =C2=A0--sharedstatedir=3D/var/lib --libexecdir=3D/usr/libexec<br>=C2=A0--lo= calstatedir=3D/var/lib --infodir=3D/usr/share/info<br>=C2=A0--mandir=3D/usr= /share/man --with-libsystemd --with-pop=3Dyes<br>=C2=A0--enable-locallisppa= th=3D/etc/emacs:/usr/local/share/emacs/28.2/site-lisp:/usr/local/share/emac= s/site-lisp:/usr/share/emacs/28.2/site-lisp:/usr/share/emacs/site-lisp<br>= =C2=A0--with-sound=3Dalsa --without-gconf --with-mailutils<br>=C2=A0--with-= native-compilation --with-cairo --with-x=3Dyes<br>=C2=A0--with-x-toolkit=3D= gtk3 --with-toolkit-scroll-bars 'CFLAGS=3D-g -O2<br>=C2=A0-ffile-prefix= -map=3D/build/reproducible-path/emacs-28.2+1=3D. -fstack-protector-strong<b= r>=C2=A0-Wformat -Werror=3Dformat-security -Wall' 'CPPFLAGS=3D-Wdat= e-time<br>=C2=A0-D_FORTIFY_SOURCE=3D2' LDFLAGS=3D-Wl,-z,relro'<br><= br>Configured features:<br>ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM = GSETTINGS HARFBUZZ JPEG<br>JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 = M17N_FLT MODULES<br>NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOU= ND THREADS TIFF<br>TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK3 ZLIB<br><br>Im= portant settings:<br>=C2=A0 value of $LANG: en_CA.UTF-8<br>=C2=A0 locale-co= ding-system: utf-8-unix<br><br>Major mode: Shell-script<br><br>Minor modes = in effect:<br>=C2=A0 sh-electric-here-document-mode: t<br>=C2=A0 display-ti= me-mode: t<br>=C2=A0 global-so-long-mode: t<br>=C2=A0 shell-dirtrack-mode: = t<br>=C2=A0 tooltip-mode: t<br>=C2=A0 global-eldoc-mode: t<br>=C2=A0 show-p= aren-mode: t<br>=C2=A0 mouse-wheel-mode: 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= auto-composition-mode: t<br>=C2=A0 auto-encryption-mode: t<br>=C2=A0 auto-= compression-mode: t<br>=C2=A0 column-number-mode: t<br>=C2=A0 line-number-m= ode: t<br>=C2=A0 transient-mark-mode: t<br><br>Load-path shadows:<br>None f= ound.<br><br>Features:<br>(shadow sort mail-extr emacsbug message rmc puny = rfc822 mml mml-sec epa<br>derived epg rfc6068 epg-config gnus-util rmail rm= ail-loaddefs time-date<br>mm-decode mm-bodies mm-encode mail-parse rfc2231 = mailabbrev gmm-utils<br>mailheader sendmail comp comp-cstr warnings cl-extr= a help-mode rfc2047<br>rfc2045 ietf-drums mm-util mail-prsvr mail-utils sh-= script smie<br>executable dired-aux term/screen term/xterm xterm cus-edit p= p cus-start<br>wid-edit ido time cus-load wdired dired dired-loaddefs so-lo= ng shell<br>pcomplete rust-utils thingatpt rust-mode rx rust-rustfmt rust-p= laypen<br>rust-compile compile text-property-search comint ansi-color ring<= br>rust-cargo finder-inf package browse-url url url-proxy url-privacy<br>ur= l-expand url-methods url-history url-cookie url-domsuf url-util<br>mailcap = url-handlers url-parse auth-source cl-seq eieio eieio-core<br>cl-macs eieio= -loaddefs password-cache json subr-x map url-vars seq<br>byte-opt gv byteco= mp byte-compile cconv cl-loaddefs cl-lib iso-transl<br>tooltip eldoc paren = electric uniquify ediff-hook vc-hooks<br>lisp-float-type elisp-mode mwheel = term/x-win x-win term/common-win x-dnd<br>tool-bar dnd fontset image regexp= -opt fringe tabulated-list replace<br>newcomment text-mode lisp-mode prog-m= ode register page tab-bar menu-bar<br>rfn-eshadow isearch easymenu timer se= lect scroll-bar mouse jit-lock<br>font-lock syntax font-core term/tty-color= s frame minibuffer cl-generic<br>cham georgian utf-8-lang misc-lang vietnam= ese tibetan thai tai-viet lao<br>korean japanese eucjp-ms cp51932 hebrew gr= eek romanian slovak czech<br>european ethiopic indian cyrillic chinese comp= osite emoji-zwj charscript<br>charprop case-table epa-hook jka-cmpr-hook he= lp simple abbrev obarray<br>cl-preloaded nadvice button loaddefs faces cus-= face macroexp files<br>window text-properties overlay sha1 md5 base64 forma= t env code-pages<br>mule custom widget hashtable-print-readable backquote t= hreads dbusbind<br>inotify lcms2 dynamic-setting system-font-setting font-r= ender-setting<br>cairo move-toolbar gtk x-toolkit x multi-tty make-network-= process<br>native-compile emacs)<br><br>Memory information:<br>((conses 16 = 199366 8596)<br>=C2=A0(symbols 48 13308 1)<br>=C2=A0(strings 32 65460 2058)= <br>=C2=A0(string-bytes 1 1538163)<br>=C2=A0(vectors 16 22561)<br>=C2=A0(ve= ctor-slots 8 424286 17680)<br>=C2=A0(floats 8 62 347)<br>=C2=A0(intervals 5= 6 1790 178)<br>=C2=A0(buffers 992 17))<br></div> --0000000000004fc489062124b2d7--
Chris Moore <christopher.ian.moore@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#72977; Package emacs.
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