unity8 crashed with signal 7 in QMutex::lock()

[Dave Morley]

Finally a retrace

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: unity8 7.84+14.04.20140327.1-0ubuntu1
Uname: Linux 3.4.0-5-mako armv7l
ApportVersion: 2.13.3-0ubuntu1
Architecture: armhf
CurrentDesktop: Unity
Date: Fri Mar 28 17:07:52 2014
ExecutablePath: /usr/bin/unity8
ExecutableTimestamp: 1395925341
InstallationDate: Installed on 2014-03-28 (0 days ago)
InstallationMedia: Ubuntu Trusty Tahr (development branch) - armhf (20140328.1)
ProcCmdline: unity8
ProcCwd: /home/phablet
RetraceOutdatedPackages: outdated debug symbol package for liblttng-ust0: package version 2.4.0~rc4-1ubuntu2 dbgsym version 2.1.1-2
Signal: 7
SourcePackage: unity8
StacktraceSource:
 #0 0xb653faa2 in QMutex::lock() () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
 #1 0xb666a026 in QCoreApplication::postEvent(QObject*, QEvent*, int) () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
 #2 0xb689bfac in ?? () from /usr/lib/arm-linux-gnueabihf/libQt5Quick.so.5
StacktraceTop:
 QMutex::lock() () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
 QCoreApplication::postEvent(QObject*, QEvent*, int) () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
 ?? () from /usr/lib/arm-linux-gnueabihf/libQt5Quick.so.5
Title: unity8 crashed with signal 7 in QMutex::lock()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm autopilot cdrom dialout dip nopasswdlogin plugdev sudo tty video

[Apport retracing service (apport)]

StacktraceTop:
 QMutex::lock() () at ../../include/QtCore/../../src/corelib/arch/qatomic_armv6.h:171
 QCoreApplication::postEvent(QObject*, QEvent*, int) () at kernel/qcoreapplication.cpp:1238
 QQuickPixmapReader::processJob(QQuickPixmapReply*, QUrl const&, QSize const&) () at util/qquickpixmapcache.cpp:566
 QQuickPixmapReader::processJobs() () at util/qquickpixmapcache.cpp:529
 QQuickPixmapReaderThreadObject::event(QEvent*) () at util/qquickpixmapcache.cpp:482