GNU bug report logs - #20216
24.5; `disassemble' function enters long (non-terminating?) loop and consumes 100% CPU when passed nonexistent symbol name

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

From: Alexis <flexibeast <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.5; `disassemble' function enters long (non-terminating?) loop and
 consumes 100% CPU when passed nonexistent symbol name
Date: Sat, 28 Mar 2015 18:25:25 +1100

From the command line:

$ timeout 5m emacs -Q --batch --eval "(disassemble 'nonexistent)"

On my machine, 100% of CPU is consumed by the `emacs' process until
`timeout' terminates it.



In GNU Emacs 24.5.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.4.2)
of 2015-03-27 on adele
Windowing system distributor `The X.Org Foundation', version 11.0.11204000
System Description:	Debian GNU/Linux 7.8 (wheezy)

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

Major mode: Lisp Interaction

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 electric-pair-mode: t
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 global-pretty-mode: t
 engine-mode: t
 global-page-break-lines-mode: t
 page-break-lines-mode: t
 change-cursor-mode: t
 global-undo-tree-mode: t
 undo-tree-mode: t
 shell-dirtrack-mode: t
 guide-key-mode: t
 global-company-mode: t
 company-mode: t
 TeX-PDF-mode: t
 erc-log-mode: t
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 erc-autojoin-mode: t
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 auto-encryption-mode: t
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 column-number-mode: t
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derived epg erc-list erc-menu erc-join erc-ring erc-networks
erc-pcomplete erc-track erc-match erc-button wid-edit erc-fill erc-stamp
erc-netsplit erc-goodies erc erc-backend erc-compat thingatpt pp
emms-volume emms-volume-amixer emms-bookmarks emms-cue
emms-mode-line-icon emms-browser sort emms-playlist-sort
emms-last-played emms-player-xine emms-player-mpd tq emms-playing-time
emms-lyrics emms-url url url-proxy url-privacy url-expand url-methods
url-history url-cookie url-domsuf mailcap emms-streams emms-tag-editor
emms-mark emms-mode-line emms-cache emms-info-ogginfo emms-info-mp3info
emms-info later-do emms-playlist-mode emms-player-vlc
emms-player-mplayer emms-player-simple emms-source-playlist
emms-source-file locate dired emms-setup emms emms-compat disp-table
org-location-google-maps org-agenda google-maps google-maps-static
url-util url-parse auth-source eieio byte-opt bytecomp byte-compile
cl-extra cconv gnus-util mm-util mail-prsvr password-cache url-vars
google-maps-geocode google-maps-base json org org-macro org-footnote
org-pcomplete pcomplete org-list org-faces org-entities time-date
noutline outline easy-mmode org-version ob-emacs-lisp ob ob-tangle
ob-ref ob-lob ob-table ob-exp org-src ob-keys ob-comint comint
ansi-color ring ob-core ob-eval org-compat org-macs org-loaddefs
format-spec find-func cal-menu calendar cal-loaddefs charmap-autoloads
charmap color-theme-autoloads color-theme-buffer-local-autoloads
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dired-details-autoloads dired-dups-autoloads dired-single-autoloads
dropdown-list-autoloads elisp-cache-autoloads edmacro kmacro
erc-view-log-autoloads esqlite-helm-autoloads esqlite-autoloads
free-keys-autoloads furl-autoloads helm-package-autoloads
http-twiddle-autoloads htmlize-autoloads irfc-autoloads
maildir-autoloads kv-autoloads manage-minor-mode-autoloads
memory-usage-autoloads mode-compile-autoloads advice notify-autoloads
oauth-autoloads oauth2-autoloads finder-inf paredit-menu-autoloads
perlcritic-autoloads regex-tool-autoloads register-list-autoloads
request-deferred-autoloads request-autoloads slime-autoloads
soundcloud-autoloads info easymenu spaces-autoloads
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eieio-core xclip-autoloads package epg-config tooltip electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd
fontset image regexp-opt fringe tabulated-list newcomment lisp-mode
prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
dbusbind gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
((conses 16 1096119 388949)
(symbols 48 75515 9)
(miscs 40 1157 2366)
(strings 32 247867 44432)
(string-bytes 1 6968772)
(vectors 16 90279)
(vector-slots 8 2004444 120585)
(floats 8 824 2704)
(intervals 56 14227 8461)
(buffers 960 67)
(heap 1024 88796 12141))

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

From: Austin Diviness <austin.diviness <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: bug#20216
Date: Sun, 05 Jul 2015 14:22:59 -0700

[Message part 1 (text/plain, inline)]

I have attached a patch that fixes this bug for me, by checking that the
argument is indeed a function as an escape hatch for the while loop in
disassemble-internal. I branched from commit
5516728eac58aba87a39427b7a3d1bfb8e2a19d0 in order to make these changes.

Austin Diviness

[0001-Bug-20216-fixed-infinite-loop-when-trying-to-disasse.patch (text/plain, attachment)]

Message #13 received at 20216-done <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> users.sourceforge.net>
To: 20216-done <at> debbugs.gnu.org
Subject: Bug #20216: 24.5; `disassemble' function enters long
 (non-terminating?) loop and consumes 100% CPU when passed nonexistent symbol
 name
Date: Sun, 26 Jun 2016 14:55:53 -0400

Version: 25.0.95

In Emacs 25, (disassemble 'nonexistent) throws (error "Compilation failed")

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