GNU bug report logs - #14515
24.3; emacs hangs when running epg with glib 2.36 and the awesome wm

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

From: Vincent Legout <vincent <at> legout.info>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; emacs hangs when running epg with glib 2.36 and the awesome wm
Date: Thu, 30 May 2013 21:31:27 +0200

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

Hello,

I'm running Debian unstable and the awesome window manager. Since the
update of glib in Debian unstable (from 2.32 to 2.36), emacs hangs when
I run epg. I also had this bug with vc-git when opening a file in a git
directory.

To reproduce this bug, I just run emacs -Q, select a region and then run
M-x epa-verify-region. Emacs gets stuck, takes 100% of a cpu and I have
to run C-g and kill epg manually. When I launch M-x epa-verify-region,
the following appears:

(emacs:32655): GLib-WARNING **: GChildWatchSource: Exit status of a child process was requested but ECHILD was received by waitpid(). Most likely the process is ignoring SIGCHLD, or some other thread is invoking waitpid() with a nonpositive first argument; either behavior can break applications that use g_child_watch_add()/g_spawn_sync() either directly or indirectly.

This bug appears with emacs24 from Debian unstable but also with emacs
24.3 from gnu.org. Downgrading to glib 2.32 fixes the issue. And this
doesn't happen with another window manager (e.g. Xfce). I was able to
reproduce this bug on three different machines with Debian unstable,
emacs 24.3, glib 2.36 and awesome.

I think this is the same bug as in:
 https://bugs.launchpad.net/ubuntu/+source/emacs24/+bug/1175422

Attached is a backtrace with gdb. It seems to be stuck at xgselect.c:48.

Thanks,
Vincent

[backtrace (application/octet-stream, attachment)]

[Message part 3 (text/plain, inline)]

In GNU Emacs 24.3.1 (x86_64-unknown-linux-gnu, X toolkit, Xaw scroll bars)
 of 2013-05-30 on eithne
Windowing system distributor `The X.Org Foundation', version 11.0.11204000
System Description:	Debian GNU/Linux unstable (sid)

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 <tab> <return>

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

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Message #8 received at 14515 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Vincent Legout <vincent <at> legout.info>
Cc: 14515 <at> debbugs.gnu.org
Subject: Re:  24.3; emacs hangs when running epg with glib 2.36 and the awesome
 wm
Date: Sat, 15 Jun 2013 00:17:43 -0700

This appears to be the same bug as Bug#12980
and Bug#9488.  Fixing it has been nontrivial,
but we have installed fixes in the trunk.
Can you give the Emacs trunk a try?

Here's how to build from the trunk:

http://www.emacswiki.org/emacs/BzrForEmacsCasualDevs#toc2

Message #11 received at 14515 <at> debbugs.gnu.org (full text, mbox):

From: Vincent Legout <vincent <at> legout.info>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 14515 <at> debbugs.gnu.org
Subject: Re: 24.3;
 emacs hangs when running epg with glib 2.36 and the awesome wm
Date: Sat, 15 Jun 2013 10:56:44 +0200

Hi,

Paul Eggert <eggert <at> cs.ucla.edu> writes:

> This appears to be the same bug as Bug#12980
> and Bug#9488.  Fixing it has been nontrivial,
> but we have installed fixes in the trunk.
> Can you give the Emacs trunk a try?

I no longer have this bug with glib 2.36.3-1 from Debian and Emacs
24.3. The bug is still there with glib 2.36.1-2 though.

And I can't reproduce the bug with Emacs trunk with both glib 2.36.1-2
and glib 2.36.3-1.

Thanks,
Vincent

Message #16 received at 14515-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Vincent Legout <vincent <at> legout.info>
Cc: 14515-done <at> debbugs.gnu.org
Subject: Re: 24.3; emacs hangs when running epg with glib 2.36 and the awesome
 wm
Date: Sat, 15 Jun 2013 17:28:55 -0700

On 06/15/2013 01:56 AM, Vincent Legout wrote:

> I can't reproduce the bug with Emacs trunk with both glib 2.36.1-2
> and glib 2.36.3-1.

Thanks for checking; I'll mark it as done then.

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