GNU bug report logs - #17011
24.3.50; Random Emacs crash when opening image/pdf files from magit.

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

From: Yagnesh Raghava Yakkala <hi <at> yagnesh.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; Random Emacs crash when opening image/pdf files from magit.
Date: Fri, 14 Mar 2014 14:10:00 +0900

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

Emacs crashes randomly (and frequently) crashing when opening images files
from magit buffer. IIRC I had reported similar bug which was fixed long ago (a
year). I am attaching the backtrace here.

[gdb.bt (application/octet-stream, attachment)]

[Message part 3 (text/plain, inline)]

Thank you.



In GNU Emacs 24.3.50.14 (x86_64-unknown-linux-gnu, GTK+ Version 3.4.2)
 of 2014-03-13 on sealion
Windowing system distributor `The X.Org Foundation', version 11.0.11204000
System Description:	Debian GNU/Linux 7.4 (wheezy)

Configured using:
 `configure --prefix=/home/yagnesh/local/emacs-7001398 --enable-checking
 --without-compress-info 'CFLAGS=-g -O0''

Important settings:
  value of $LC_COLLATE: en_US.UTF-8
  value of $LC_CTYPE: en_US.UTF-8
  value of $LC_MESSAGES: en_US.UTF-8
  value of $LANG: C
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Summary

Minor modes in effect:
  display-time-mode: t
  erc-services-mode: t
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
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  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<return> <return> M-x r e p o <return>

Recent messages:
Checking new news...
Reading active file via nnml...
Reading incoming mail from file...
Reading incoming mail from pop...
nnml: Reading incoming mail (no new mail)...done
Reading active file via nnml...done
Reading active file from archive via nnfolder...done
Reading active file via nndraft...done
Checking new news...done
Warning: Opening nnimap server on localimap...failed: ; Unable to open server nnimap+localimap due to: make client process failed: connection refused, :name, *nnimap*, :buffer,  *nnimap localhost nil  *nntpd**, :host, localhost, :service, 993, :nowait, nil

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Features:
(shadow vc-git goto-addr autoinsert bbdb-message footnote emacsbug gnus-ml
disp-table gnus-topic pop3 nndraft nnmh nnml utf-7 nnfolder bbdb-gnus gnutls
network-stream gnus-agent gnus-srvr gnus-score score-mode nnvirtual gnus-cache
spam spam-stat gnus-uu yenc gnus-msg gnus-demon nntp gnus-cite nnir
gnus-gravatar mail-extr gnus-art mm-uu mml2015 mm-view mml-smime smime dig
gnus-sum gnus-group gnus-undo gravatar url-cache bbdb-mua bbdb-com bbdb
bbdb-site timezone bbdb-loaddefs starttls nnimap nnmail mail-source tls utf7
netrc nnoo gnus-start gnus-spec gnus-int gnus-range message rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils
mailheader gnus-win gnus gnus-ems nnheader notifications warnings
elisp-slime-nav etags eldoc paredit flycheck rx f dash emms-info-libtag
emms-playlist-limit emms-volume emms-volume-amixer emms-i18n emms-history
emms-score emms-stream-info emms-metaplaylist-mode emms-bookmarks
emms-lastfm-client parse-time 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 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 emms-setup emms
emms-compat time ps-print ps-def lpr jabber-autoloads twittering-mode url
url-proxy url-privacy url-expand url-methods url-history url-cookie url-domsuf
url-util url-parse url-vars mailcap battery erc-services erc-log erc-notify
erc-imenu erc-list erc-menu erc-join erc-ring erc-networks erc-pcomplete
erc-track erc-match erc-button erc-fill erc-stamp erc-netsplit erc-goodies erc
erc-backend erc-compat w3m-load webjump browse-url japanese-holidays diary-lib
diary-loaddefs org-indent ox-beamer ox-latex ox-icalendar ox-html ox-ascii
ox-publish ox org-element avl-tree org org-macro org-footnote org-pcomplete
org-list org-faces org-entities noutline outline org-version ob-emacs-lisp ob
ob-tangle org-src ob-ref ob-lob ob-table ob-keys ob-exp ob-comint ob-core
ob-eval org-compat org-macs org-loaddefs cal-menu calendar cal-loaddefs
org-install git-gutter-fringe git-gutter fringe-helper zotelo tex-buf tex dbus
xml crm preview-latex tex-site auto-loads ncl-mode-load inf-ncl ncl-mode
cus-edit cus-start cus-load ncl-doc easy-mmode ncl-mode-keywords s
namelist-mode-load compile pylookup generic geiser-load geiser find-func
highlight-parentheses hl-sexp dired-aux dired-x dired-details windmove winner
readline-complete tramp-cache tramp-sh tramp tramp-compat tramp-loaddefs
trampver shell pcomplete comint ansi-color ring format-spec recentf
tree-widget wid-edit imenu goto-last-change saveplace ace-jump-mode dictem
multiple-cursors mc-separate-operations rectangular-region-mode mc-mark-pop
mc-mark-more thingatpt mc-cycle-cursors mc-edit-lines multiple-cursors-core
rect yasnippet auto-complete-config auto-complete popup flyspell ispell smex
ido diminish backup-each-save elec-pair paren smtpmail auth-source gnus-util
password-cache sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr edmacro
kmacro door-gnus epa-mail mail-utils epa-file epa epg epg-config deferred
.loaddefs pydoc-info advice info-look info eieio byte-opt eieio-core el-get
el-get-autoloads el-get-list-packages el-get-notify help-mode easymenu
el-get-dependencies el-get-build el-get-status pp el-get-recipes derived
el-get-byte-compile el-get-methods el-get-fossil el-get-svn el-get-pacman
el-get-github-zip el-get-github-tar el-get-http-zip el-get-http-tar el-get-hg
el-get-go el-get-git-svn el-get-fink el-get-emacswiki el-get-http
el-get-emacsmirror el-get-github el-get-git el-get-elpa package el-get-darcs
el-get-cvs el-get-bzr el-get-brew el-get-builtin el-get-apt-get el-get-custom
el-get-core cl-macs gv autoload help-fns lisp-mnt bytecomp byte-compile cconv
cl cl-loaddefs cl-lib dired time-date 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)

-- 
ఎందరో మహానుభావులు అందరికి వందనములు.
YYR

Message #8 received at 17011 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Yagnesh Raghava Yakkala <hi <at> yagnesh.org>
Cc: 17011 <at> debbugs.gnu.org
Subject: Re: 24.3.50; Random Emacs crash when opening image/pdf files from
 magit.
Date: Tue, 25 Mar 2014 22:42:38 -0700

Thanks, with that backtrace I reproduced the core dump as follows:

Build emacs with -DENABLE_CHECKING in CFLAGS.
./emacs -Q
M-x find-file-literally RET somefile RET
M-x set-var RET case-fold-search RET t RET
M-: (char-equal 270 300) RET

I installed a patch as emacs-24 bzr 116863, which worked for me; please 
give it a try.

http://bzr.savannah.gnu.org/lh/emacs/emacs-24/revision/116863

Message #15 received at 17011 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: hi <at> yagnesh.org, 17011 <at> debbugs.gnu.org
Subject: Re: bug#17011: 24.3.50;
 Random Emacs crash when opening image/pdf files from magit.
Date: Wed, 26 Mar 2014 17:19:36 +0200

> Date: Tue, 25 Mar 2014 22:42:38 -0700
> From: Paul Eggert <eggert <at> cs.ucla.edu>
> Cc: 17011 <at> debbugs.gnu.org
> 
> Thanks, with that backtrace I reproduced the core dump as follows:
> 
> Build emacs with -DENABLE_CHECKING in CFLAGS.
> ./emacs -Q
> M-x find-file-literally RET somefile RET
> M-x set-var RET case-fold-search RET t RET
> M-: (char-equal 270 300) RET
> 
> I installed a patch as emacs-24 bzr 116863, which worked for me; please 
> give it a try.
> 
> http://bzr.savannah.gnu.org/lh/emacs/emacs-24/revision/116863

That's a backward-incompatible change: it changes behavior for those
eight-bit bytes that are now interpreted as Latin letters.  I don't
think we should make incompatible changes on the release branch (or at
all) in this case.

I suggest the following compatible change (the diffs are relative to
the emacs-24 sources before r116833):

--- src/editfns.c~0	2014-01-26 07:13:31 +0200
+++ src/editfns.c	2014-03-26 10:14:31 +0200
@@ -4378,16 +4378,19 @@ Case is ignored if `case-fold-search' is
     return Qnil;
 
   i1 = XFASTINT (c1);
-  if (NILP (BVAR (current_buffer, enable_multibyte_characters))
-      && ! ASCII_CHAR_P (i1))
-    {
-      MAKE_CHAR_MULTIBYTE (i1);
-    }
   i2 = XFASTINT (c2);
-  if (NILP (BVAR (current_buffer, enable_multibyte_characters))
-      && ! ASCII_CHAR_P (i2))
+  if (NILP (BVAR (current_buffer, enable_multibyte_characters)))
     {
-      MAKE_CHAR_MULTIBYTE (i2);
+      /* It should still be possible to compare multibyte characters
+	 even though the current buffer is unibyte (see bug#17011).
+	 This causes dilemma wrt characters between 128 and 255 --
+	 they could be either eight-bit raw bytes or Latin-1
+	 characters.  We resolve this dilemma here in favor of
+	 eight-bit bytes, since we are in a unibyte buffer.  */
+      if (! ASCII_CHAR_P (i1) && i1 < 0x0100)
+	MAKE_CHAR_MULTIBYTE (i1);
+      if (! ASCII_CHAR_P (i2) && i2 < 0x0100)
+	MAKE_CHAR_MULTIBYTE (i2);
     }
   return (downcase (i1) == downcase (i2) ? Qt :  Qnil);
 }

Message #18 received at 17011 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: hi <at> yagnesh.org, 17011 <at> debbugs.gnu.org
Subject: Re: bug#17011: 24.3.50;	Random Emacs crash when opening image/pdf
 files from magit.
Date: Wed, 26 Mar 2014 11:01:39 -0700

Eli Zaretskii wrote:
> That's a backward-incompatible change

I suppose you're right that backwards compatibility trumps other 
concerns at this stage in the release process.  I installed a patch to 
do that as emacs-24 bzr 116866.  I left in a FIXME comment, though, as 
the old behavior is obviously problematic.

This later patch shouldn't affect whether the bug is fixed.

Message #21 received at 17011 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: hi <at> yagnesh.org, 17011 <at> debbugs.gnu.org
Subject: Re: bug#17011: 24.3.50;
 Random Emacs crash when opening image/pdf files from magit.
Date: Wed, 26 Mar 2014 20:53:51 +0200

> Date: Wed, 26 Mar 2014 11:01:39 -0700
> From: Paul Eggert <eggert <at> cs.ucla.edu>
> CC: hi <at> yagnesh.org, 17011 <at> debbugs.gnu.org
> 
> Eli Zaretskii wrote:
> > That's a backward-incompatible change
> 
> I suppose you're right that backwards compatibility trumps other 
> concerns at this stage in the release process.  I installed a patch to 
> do that as emacs-24 bzr 116866.

Thanks.

> I left in a FIXME comment, though, as the old behavior is obviously
> problematic.

Let's discuss this on emacs-devel.

Message #26 received at 17011-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: 17011-done <at> debbugs.gnu.org
Subject: Re: 24.3.50; Random Emacs crash when opening image/pdf files from
 magit.
Date: Sat, 29 Mar 2014 22:53:56 -0700

Closing this bug as I'm pretty sure it's fixed now.  We can reopen it if 
I'm wrong.

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