qmlscene crashed with SIGABRT in deref()

[Daniel Holbach]

This fails: "xvfb-run qmlscene /usr/share/ubuntu-html5-container/examples/simple/simple.qml".

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: qmlscene 5.0.2-6ubuntu5
ProcVersionSignature: Ubuntu 3.13.0-7.25-generic 3.13.1
Uname: Linux 3.13.0-7-generic x86_64
ApportVersion: 2.13.2-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Feb 5 17:09:41 2014
ExecutablePath: /usr/lib/x86_64-linux-gnu/qt5/bin/qmlscene
InstallationDate: Installed on 2013-12-22 (45 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20131221)
ProcCmdline: /usr/lib/x86_64-linux-gnu/qt5/bin/qmlscene /usr/share/ubuntu-html5-container/examples/simple/simple.qml
Signal: 6
SourcePackage: qtdeclarative-opensource-src
StacktraceTop:
 QMessageLogger::fatal(char const*, ...) const () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
 ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
 ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
 QWindow::create() () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
 QWindow::setVisible(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
Title: qmlscene crashed with SIGABRT in QMessageLogger::fatal()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm autopilot cdrom dip lpadmin plugdev sambashare scanner sudo

[Apport retracing service (apport)]

StacktraceTop:
 deref (this=0x6) at ../../include/QtCore/../../src/corelib/tools/qrefcount.h:69
 ~QString (this=0x7fffd9452b10, __in_chrg=<optimized out>) at ../../include/QtCore/../../src/corelib/tools/qstring.h:909
 QLibraryInfo::location (loc=32767) at global/qlibraryinfo.cpp:441
 ?? ()
 ?? ()

[Timo Jyrinki (timo-jyrinki)]

Marking the bug as Incomplete to indicate it's probably not reproducible anymore. Qt Declarative script engine was rewritten in the Qt 5.2.1 and it's likely the crashes that happened with Qt 5.0.2 do not happen or are different with the new Qt.

[Timo Jyrinki (timo-jyrinki)]

Sorry, my mistake, there was a clear test case. Still crashes with Qt 5.3.2 in vivid when using xvfb-run. Works with normal qmlscene without xfvb-run.

It even crashes with QT_QPA_PLATFORM=minimal xvfb-run -a qmlscene /usr/share/ubuntu-html5-container/examples/simple/simple.qml - but it gives more debug output. It seems to be because of createPlatformOpenGLContext is tried to be called.

Qt 5's Qt Quick 2 / QML2 requires OpenGL (2.0+) support but probably this should fail more graciously. I don't think this is a high priority bug though. It might be good to think of a good test case / explanation and report to upstream https://bugreports.qt-project.org/.

xvfb-run is successfully used to run Qt unit tests.