bug#18112: 24.4.50; emacs --daemon infinite loop in find_interval

[Mark Oteiza <mvoteiza@udel.edu>]

Reproducible on my system with tmux 1.9a:

1. emacs --daemon -Q
2. Start tmux in a term emulator and invoke `emacsclient -t` in
   the tmux window
3. Do `C-x 3` in the client
4. Split horizontally the tmux window into two panes: <prefix> "
5. Open a new emacsclient in the new pane, exit the client (^X^C),
   and close the new tmux pane (^D)
6. Interact with the first client.

Attaching with gdb the first time:

find_interval (tree=0xed9198, position=732) at intervals.c:681
681     in intervals.c
(gdb) s
683     in intervals.c
(gdb) s
701     in intervals.c
(gdb) s
681     in intervals.c
(gdb) s
683     in intervals.c
(gdb) s
701     in intervals.c

Otherwise, setting a breakpoint at find_interval and continuing,
`position` changes value but I always end up back at find_interval.



In GNU Emacs 24.4.50.1 (x86_64-unknown-linux-gnu, X toolkit, Xaw scroll bars)
 of 2014-07-24 on holos
Configured using:
 `configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=lucid 'CFLAGS=-march=x86-64
 -mtune=generic -O0 -pipe -fstack-protector-strong
 --param=ssp-buffer-size=4 -g -fvar-tracking-assignments'
 LDFLAGS=-Wl,-O0,--sort-common,--as-needed,-z,relro'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB

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

Major mode: Lisp Interaction

Minor modes in effect:
  flycheck-mode: t
  company-mode: t
  winner-mode: t
  show-paren-mode: t
  tooltip-mode: t
  electric-indent-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
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t

Recent input:
ESC [ > 0 ; 9 5 ; 0 c ESC x r e p o - e m - b TAB 
RET

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

Load-path shadows:
/usr/share/emacs/24.4.50/lisp/loaddefs hides /home/mvo/.emacs.d/site-lisp/loaddefs

Features:
(shadow sort gnus-util mail-extr emacsbug message idna dired format-spec
rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util help-fns mail-prsvr mail-utils xterm flycheck find-func
help-mode easymenu rx f dash s company-files company-oddmuse
company-keywords company-etags etags company-gtags company-dabbrev-code
company-dabbrev company-capf company-cmake company-ropemacs
company-xcode company-clang company-semantic company-eclim
company-template company-css company-nxml company-bbdb company pcase
easy-mmode cl-macs gv package windmove edmacro kmacro cl-loaddefs cl-lib
saveplace winner ring time-date paren zenburn-theme 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 x-toolkit x multi-tty emacs)

Memory information:
((conses 16 130940 8879)
 (symbols 48 21621 0)
 (miscs 40 46 141)
 (strings 32 22838 6984)
 (string-bytes 1 615107)
 (vectors 16 17827)
 (vector-slots 8 1133415 211358)
 (floats 8 92 595)
 (intervals 56 205 0)
 (buffers 960 11)
 (heap 1024 46183 1194))