GNU bug report logs - #21626
24.5; Segfault on C-z on Mac OS X 10.11

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

From: David Caldwell <david <at> porkrind.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.5; Segfault on C-z on Mac OS X 10.11
Date: Mon, 5 Oct 2015 14:51:51 -0700

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

1. emacs -Q
2. C-z

The window mimizes and then Emacs crashes.

This only happens on Mac OS X 10.11 (100% of the time). I just tested on
10.10 and I couldn't get it to crash. It only happens in ns mode ("emacs
-nw" works fine).

I don't have a gdb backtrace, but I have attached an OS backtrace
(backtrace-1.txt). I also received a backtrace from someone else having the
same problem. Their backtrace (backtrace-2.txt) is similar but shows what
looks like a NULL pointer function call.

-David

In GNU Emacs 24.5.1 (x86_64-apple-darwin13.4.0, NS apple-appkit-1265.21)
of 2015-04-10 on builder10-9.porkrind.org
Windowing system distributor `Apple', version 10.3.1404
Configured using:
`configure --with-ns '--enable-locallisppath=/Library/Application
Support/Emacs/${version}/site-lisp:/Library/Application
Support/Emacs/site-lisp''

Important settings:
locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
auto-insert-mode: t
show-paren-mode: t
global-auto-revert-mode: t
delete-selection-mode: t
tooltip-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
buffer-read-only: t
size-indication-mode: t
column-number-mode: t
line-number-mode: t
transient-mark-mode: t

Recent messages:
Loading delsel...done
Loading autorevert...done
Loading gnus...done
Loading paren...done
Failed to enable theme: calmer-forest
My .emacs loaded in 0.000000s
My .emacs loaded in 0.418803s
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug calmer-forest-theme
ack-and-a-half-autoloads flymake-css-autoloads flymake-cursor-autoloads
flymake-haml-autoloads flymake-jslint-autoloads
flymake-perlcritic-autoloads flymake-php-autoloads
flymake-ruby-autoloads flymake-shell-autoloads go-mode-autoloads
magithub-autoloads mode-compile-autoloads nav-autoloads
rainbow-mode-autoloads info slime-autoloads svg-clock-autoloads package
epg-config commit-patch-buffer pcase log-edit easy-mmode message
sendmail format-spec rfc822 mml easymenu mml-sec mm-decode mm-bodies
mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mailabbrev
gmm-utils mailheader ring pcvs-util add-log vc vc-dispatcher
david-custom-emacs-setup advice david-headers autoinsert ginel-string
david-keys david-movement edmacro kmacro david-coding-style saveplace
paren gnus gnus-ems nnheader gnus-util mail-utils mm-util help-fns
mail-prsvr wid-edit cl-loaddefs cl-lib autorevert filenotify delsel
cus-start cus-load benchmark time-date tooltip electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel ns-win 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
cocoa ns multi-tty emacs)

Memory information:
((conses 16 161195 16306)
(symbols 48 25173 0)
(miscs 40 89 203)
(strings 32 36358 13087)
(string-bytes 1 954275)
(vectors 16 22379)
(vector-slots 8 1210585 203755)
(floats 8 97 52)
(intervals 56 241 8)
(buffers 960 12))

[backtrace-1.txt (text/plain, attachment)]

[backtrace-2.txt (text/plain, attachment)]

Message #8 received at 21626 <at> debbugs.gnu.org (full text, mbox):

From: David Caldwell <david <at> porkrind.org>
To: 21626 <at> debbugs.gnu.org
Subject: Re: bug#21626: 24.5; Segfault on C-z on Mac OS X 10.11
Date: Tue, 6 Oct 2015 10:12:12 -0700

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

I had just enough time this morning to build Emacs from git (master) and
catch the crash in lldb. I've attached my lldb session in case it
helps. I'll continue looking into it when I get some time.

-David

[lldb.txt (text/plain, attachment)]

Message #11 received at 21626 <at> debbugs.gnu.org (full text, mbox):

From: Alan Third <alan <at> idiocy.org>
To: David Caldwell <david <at> porkrind.org>
Cc: 21626 <at> debbugs.gnu.org
Subject: Re: bug#21626: 24.5; Segfault on C-z on Mac OS X 10.11
Date: Wed, 25 May 2016 22:40:16 +0100

David Caldwell <david <at> porkrind.org> writes:

> 1. emacs -Q
> 2. C-z
>
> The window mimizes and then Emacs crashes.
>
> This only happens on Mac OS X 10.11 (100% of the time). I just tested on
> 10.10 and I couldn't get it to crash. It only happens in ns mode ("emacs
> -nw" works fine).
>
> I don't have a gdb backtrace, but I have attached an OS backtrace
> (backtrace-1.txt). I also received a backtrace from someone else having the
> same problem. Their backtrace (backtrace-2.txt) is similar but shows what
> looks like a NULL pointer function call.

Hi, a fix for this problem has been committed to Emacs 25. If you try
Emacs 25 and find you still get the crash, please raise a new bug
report.

More info here:

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=23462

-- 
Alan Third

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