[Bug 1393105] [NEW] GNUbg crashes shortly after starting game

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[Preamble]
I am one of the primary upstream maintainers of the GNUbg project.

[Impact]
When a user starts a new match GNUbg will crash with this error (on the console):

    Attempt to unlock mutex that was not locked
    Aborted (core dumped)

This issue is a regression that appeared in Ubuntu 14.10 . It wasn't an
issue in Ubuntu 14.04. This bug should be a high priority for this
application because this bug renders the software completely unusable.

[Test Case]
To reproduce launch GNUbg and click the "New" icon to start a new match. Click "Ok" on the match parameters screen (no need to modify the settings). The match should start. You may need to hit Control-R to roll to roll the dice (alternatively click the middle of the board on the right side). Shortly after doing so the application will close down.

[Regression Potential]
The patch/bug fix attached to this report should be reasonably low risk and should not impact other software on the users system. Most regressions that may result from any new problems that could be introduced are that the analysis output may be slightly different.

Upstream official software releases (1.03.000 and 1.04.000) have been
using the fixes in this patch for a few months without any reported
issues and as a result are considered well tested by the upstream
maintainers.

[Bug cause]
New versions of Glib have extra assertions that may reveal hidden bugs. This happened with GNUbg. The problem highlighted issues in how we were using mutexes (creations/usage/cleanup). Older versions of Glib didn't have these newer assertions so the problem had gone undetected in previous releases.

[Bug history]
The set of changes in this patch were applied to the upstream version of GNUbg in July 2014 based upon a bug report of a user that was using a PPA version of Glib in Ubuntu 14.04. That bug and further information about the nature of this issue can be found here: https://bugs.launchpad.net/ubuntu/+source/gnubg/+bug/1346567

There was a report of this bug shortly after 14.10 was release but for
some inexplicable reason it was deleted from launchpad.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: gnubg 1.02.000-2
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Uname: Linux 3.16.0-24-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Nov 15 17:08:35 2014
InstallationDate: Installed on 2014-10-24 (22 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
ProcEnviron:
 LANGUAGE=en_CA:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: gnubg
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnubg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug patch utopic
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GNUbg crashes shortly after starting game
https://bugs.launchpad.net/bugs/1393105
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