bug#18403: 24.4.50; emacsclient sometimes hangs on exit with Lucid GUI client

[Christoph Scholtes <cschol2112@gmail.com>]

Emacs 24 (r117814) compiled with Lucid toolkit.

Steps to reproduce:

emacs --daemon -q
emacsclient -c
Exit GUI client with `C-x C-c' or evaluate `(kill-emacs)' in *scratch*.

Emacsclient will hang with `Waiting for Emacs...' at the shell prompt
and not exit. In case of `(kill-emacs)', it will kill the daemon
correctly, but emacsclient hangs.

I attached a debugger and Emacs seems to be stuck in the do..while loop around
line 1734 of `emacsclient.c'.

I tried same procedure with Emacs compiled with GTK3 and it works
correctly. emacsclient exits at the prompt upon executing either `C-x
C-c' or (kill-emacs).

emacsclient -t also works correctly and emacsclient exits after
executing `C-x C-c'.



In GNU Emacs 24.4.50.2 (x86_64-unknown-linux-gnu, X toolkit, Xaw scroll bars)
 of 2014-09-03 on marvin
Repository revision: 117814 eggert@cs.ucla.edu-20140904020246-9nko8pp4vqjsfdfy
Windowing system distributor `The X.Org Foundation', version 11.0.11103000
System Description:	Linux Mint 13 Maya

Configured using:
 `configure --with-x-toolkit=lucid'

Configured features:
XPM JPEG TIFF GIF PNG SOUND DBUS GCONF GSETTINGS NOTIFY LIBSELINUX
GNUTLS LIBXML2 FREETYPE XFT ZLIB

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

Major mode: Lisp Interaction

Minor modes in effect:
  eldoc-mode: t
  my-keys-minor-mode: t
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  show-smartparens-global-mode: t
  show-smartparens-mode: t
  smartparens-global-mode: t
  smartparens-strict-mode: t
  smartparens-mode: t
  shell-dirtrack-mode: t
  desktop-save-mode: t
  ido-everywhere: t
  global-auto-revert-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:
M-x r e p o r t - e m a c s - b u g <return>

Recent messages:
Desktop: 1 frame, 0 buffers restored.
Starting Emacs daemon.
Restarting server
Saving all Org-mode buffers...
(No files need saving)
Saving all Org-mode buffers... done
Saving all Org-mode buffers...
(No files need saving)
Saving all Org-mode buffers... done
When done with this frame, type C-x 5 0

[...]

Memory information:
((conses 16 287414 14434)
 (symbols 48 41994 0)
 (miscs 40 87 169)
 (strings 32 88161 8807)
 (string-bytes 1 2681717)
 (vectors 16 32629)
 (vector-slots 8 631672 6983)
 (floats 8 203 274)
 (intervals 56 319 0)
 (buffers 976 12)
 (heap 1024 29623 1082))