Subject: 24.3; Emacs crashes in c-mode if I yank certain text then undo with M-/.

From: Jesse <[email-masked]>
Date: Mon, 20 May 2013 16:58:18 -0600

Starting from emacs -Q:

M-x c-mode <RET>
C-x h <BACKSPACE>
Type the text "#include <stdio.h>"
C-Space
C-a
C-w
C-y
C-y
M-/

This causes a segmentation fault, I can't even imagine why. I've found
that any last line of text beginning with the '#' character, cannot be
yanked, and then have that yank undone, without emacs crashing. It's
very specific, but also very detrimental.

$ gdb 'emacs'
GNU gdb (GDB) 7.6
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-pc-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/emacs-24.3...(no debugging symbols 
found)...done.
(gdb) run -Q
Starting program: /usr/bin/emacs-24.3 -Q
warning: Could not load shared library symbols for linux-gate.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".

** (emacs-24-3:11678): WARNING **: Couldn't register with accessibility 
bus: Did not receive a reply. Possible causes include: the remote 
application did not send a reply, the message bus security policy 
blocked the reply, the reply timeout expired, or the network connection 
was broken.

(emacs-24-3:11678): GConf-WARNING **: Client failed to connect to the 
D-BUS daemon:
Failed to connect to socket /tmp/dbus-Atw3nvy7Lw: Connection refused

(emacs-24-3:11678): GConf-WARNING **: Client failed to connect to the 
D-BUS daemon:
Failed to connect to socket /tmp/dbus-Atw3nvy7Lw: Connection refused

(emacs-24-3:11678): GConf-WARNING **: Client failed to connect to the 
D-BUS daemon:
Failed to connect to socket /tmp/dbus-Atw3nvy7Lw: Connection refused

(emacs-24-3:11678): GConf-WARNING **: Client failed to connect to the 
D-BUS daemon:
Failed to connect to socket /tmp/dbus-Atw3nvy7Lw: Connection refused

(emacs-24-3:11678): GConf-WARNING **: Client failed to connect to the 
D-BUS daemon:
Failed to connect to socket /tmp/dbus-Atw3nvy7Lw: Connection refused

(emacs-24-3:11678): GConf-WARNING **: Client failed to connect to the 
D-BUS daemon:
Failed to connect to socket /tmp/dbus-Atw3nvy7Lw: Connection refused
[New Thread 0xb42dfb40 (LWP 11682)]

Program received signal SIGSEGV, Segmentation fault.
0x081d2433 in ?? ()
(gdb) bt full
#0 0x081d2433 in ?? ()
No symbol table info available.
#1 0x081d3bfd in ?? ()
No symbol table info available.
#2 0x081d3ec8 in ?? ()
No symbol table info available.
#3 0x0816b09d in ?? ()
No symbol table info available.
#4 0x081870c3 in ?? ()
No symbol table info available.
#5 0x081ba72b in ?? ()
No symbol table info available.
#6 0x08186c4d in ?? ()
No symbol table info available.
#7 0x08186f0a in ?? ()
No symbol table info available.
#8 0x081ba72b in ?? ()
No symbol table info available.
#9 0x08186c4d in ?? ()
No symbol table info available.
#10 0x08186f0a in ?? ()
No symbol table info available.
#11 0x08183901 in ?? ()
No symbol table info available.
#12 0x081870af in ?? ()
No symbol table info available.
#13 0x08188a17 in ?? ()
No symbol table info available.
#14 0x08125c41 in ?? ()
No symbol table info available.
#15 0x081857ae in ?? ()
No symbol table info available.
#16 0x08117ff5 in ?? ()
No symbol table info available.
#17 0x081856c3 in ?? ()
No symbol table info available.
#18 0x0811c492 in ?? ()
No symbol table info available.
#19 0x0811c76d in ?? ()
No symbol table info available.
#20 0x08058b98 in ?? ()
No symbol table info available.
#21 0xb67ae7c3 in __libc_start_main () from /usr/lib/libc.so.6
No symbol table info available.
#22 0x08059845 in ?? ()
No symbol table info available.
(gdb) xbacktrace
Undefined command: "xbacktrace". Try "help".
(gdb) quit
A debugging session is active.

Inferior 1 [process 11678] will be killed.

Quit anyway? (y or n) y

In GNU Emacs 24.3.1 (i686-pc-linux-gnu, GTK+ Version 3.8.1)
of 2013-04-29 on eric
Windowing system distributor `The X.Org Foundation', version 11.0.11401000
System Description: Arch Linux

Configured using:
`configure '--prefix=/usr' '--sysconfdir=/etc' '--libexecdir=/usr/lib'
'--localstatedir=/var' '--with-x-toolkit=gtk3' '--with-xft'
'CFLAGS=-march=i686 -mtune=generic -O2 -pipe -fstack-protector
--param=ssp-buffer-size=4'
'LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro'
'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
default enable-multibyte-characters: t

Major mode: Lisp Interaction

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

Recent input:
M-x r e p o r t SPC b u g <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

Features:
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mm-util mail-prsvr mail-utils time-date tooltip ediff-hook vc-hooks
lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt
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