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bug#17237: 24.3.50; Hang with X11 + emacsclient

From: Aaron Ecay
Subject: bug#17237: 24.3.50; Hang with X11 + emacsclient
Date: Thu, 10 Apr 2014 20:48:35 -0400
User-agent: Notmuch/0.17+171~gbc10f63 (http://notmuchmail.org) Emacs/ (x86_64-unknown-linux-gnu)

I observe strange hangs when using org-protocol via emacsclient, under
X11.  Recipe to reproduce:

1. emacs -Q (recent trunk version; I’ve been seeing the bug for several
   weeks if not longer)
2. M-x server-start
3. touch ~/test

If I invoke the following command from a shell on the same X11 virtual
desktop as emacs, it works fine:

emacsclient ~/test

However, if I invoke the same command from a terminal on another
desktop, the CPU usage spikes of both emacs (to ~50%) and the X server
process (to ~85%), as visible in top.  emacsclient prints "Waiting for
Emacs..." to the terminal, and does not exit.

The processes will stay in this busy hang until I switch to the virtual
desktop with the emacs frame on it, at which point the file will open in
emacs.  (I suspect that the file does not open earlier, as sometimes I
can see a brief glimpse of the previous buffer when switching to emacs’s
desktop, before the buffer called for by emacsclient replaces it.)

I can then edit normally and exit the server buffer normally with C-x #
causing the emacsclient to exit in the terminal window.

Possibly relevant software versions:
- Arch Linux
- X.org server version 1.15.0-5
- Window manager = a devel version of xmonad (most recent commit is:
  Sat Jul 20 15:21:24 EDT 2013  Adam Vogt <address@hidden>)


In GNU Emacs (x86_64-unknown-linux-gnu, GTK+ Version 3.10.7)
 of 2014-04-06 on haize
Windowing system distributor `The X.Org Foundation', version 11.0.11500000
Configured using:
 `configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --mandir=/usr/share/man
 --enable-link-time-optimization --with-sound=alsa --without-gconf
 --with-x-toolkit=gtk3 --with-xft 'CFLAGS=-march=x86-64 -mtune=generic
 -O2 -pipe -fstack-protector --param=ssp-buffer-size=4'

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

Major mode: Org

Minor modes in effect:
  TeX-source-correlate-mode: t
  rcirc-track-minor-mode: t
  auto-insert-mode: t
  flyspell-mode: t
  erefactor-check-eval-mode: t
  magit-auto-revert-mode: t
  diff-auto-refine-mode: t
  auto-revert-mode: t
  desktop-save-mode: t
  electric-pair-mode: t
  typopunct-mode: t
  which-function-mode: t
  global-goto-address-mode: t
  goto-address-mode: t
  shell-dirtrack-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  show-paren-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  sml-modeline-mode: t
  ido-everywhere: t
  minibuffer-depth-indicate-mode: t
  icomplete-mode: t
  command-frequency-autosave-mode: t
  command-frequency-mode: t
  savehist-mode: t
  recentf-mode: t
  global-auto-complete-mode: t
  auto-complete-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
  column-number-mode: t
  line-number-mode: t
  auto-fill-function: org-auto-fill-function
  transient-mark-mode: t
  abbrev-mode: t

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

Aaron Ecay

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