Emacs24 hangs when starting shell

[Robert Zeh]

I'm running emacs24 on an Ubuntu box and displaying back to a Windows box running Xming.

When I start up emacs24 (with "emacs -q" on the command line) with a remote display and type "M-x shell" emacs24 will hang, and display the following in stdout:
(emacs24:1493): 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.

If I startup emacs24 without a remote display ("emacs -q -nw") emacs 24 does not hang for "M-x shell".

If I attempt to visit a directory (with dired) emacs24 will hang, and display the following on stdout:
(emacs:2331): 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.

If I startup emacs24 without a remote display ("emacs -q -nw") emacs 24 does not hang for dired.

If I startup emacs24 with my remote display and type "M-x compile" it hangs. Without the remote display it does not hang.

In the shell case, the process tree looks like this:
 1273 14063 14063 14063 ? -1 Ss 0 0:00 \_ sshd: rzeh [priv]
14063 14078 14063 14063 ? -1 S 10021 0:06 | \_ sshd: rzeh@pts/3
14078 14079 14079 14079 pts/3 4413 Ss 10021 0:00 | \_ -bash
14079 3880 3880 14079 pts/3 4413 Sl 10021 0:00 | \_ emacs24 -q
 3880 4411 4411 4411 ? -1 Zs 10021 0:00 | | \_ [bash] <defunct>
14079 4413 4413 14079 pts/3 4413 R+ 10021 0:00 | \_ ps axjf -Urzeh

The defunct bash shell is an emacs24 child.

My environment has NO_AT_BRIDGE set to 1, to avoid the accessibility bus warnings. Unsetting the environment variable doesn't eliminate the hangs.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: emacs24 24.2+1-2ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-19.30-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.5
Architecture: amd64
Date: Thu Dec 12 09:05:38 2013
InstallationDate: Installed on 2013-10-04 (68 days ago)
InstallationMedia: Ubuntu-Server 13.04 "Raring Ringtail" - Release amd64 (20130423.1)
MarkForUpload: True
ProcEnviron:
 LD_LIBRARY_PATH=<set>
 TERM=xterm
 PATH=(custom, no user)
 SHELL=/bin/bash
SourcePackage: emacs24
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.