Bug 344943

Application: systemsettings5 (5.2.1)

Qt Version: 5.4.0
Operating System: Linux 3.19.0-7-generic x86_64
Distribution: Ubuntu Vivid Vervet (development branch)

-- Information about the crash:
- What I was doing when the application crashed:
System Settings->Application Style->Window Decorations, select non default decoration, then click back on <Overview

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fd051511780 (LWP 5496))]

Thread 3 (Thread 0x7fd0421ea700 (LWP 5497)):
#0  0x00007fd04dc620cd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fd04c9b0b72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fd04c9b264f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fd0447350b9 in QXcbEventReader::run (this=0x1694170) at qxcbconnection.cpp:1105
#4  0x00007fd04e2e9a4e in QThreadPrivate::start (arg=0x1694170) at thread/qthread_unix.cpp:337
#5  0x00007fd04b8c80a5 in start_thread (arg=0x7fd0421ea700) at pthread_create.c:309
#6  0x00007fd04dc6c57d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7fd030edb700 (LWP 5502)):
#0  0x00007fd04b3ed7a4 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fd04b3a83f0 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd04b3a8de8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd04b3a8fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd04e580acc in QEventDispatcherGlib::processEvents (this=0x7fd02c071660, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007fd04e525392 in QEventLoop::exec (this=this@entry=0x7fd030edae20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fd04e2e4a94 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007fd03187a865 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fd04e2e9a4e in QThreadPrivate::start (arg=0x2226ca0) at thread/qthread_unix.cpp:337
#9  0x00007fd04b8c80a5 in start_thread (arg=0x7fd030edb700) at pthread_create.c:309
#10 0x00007fd04dc6c57d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7fd051511780 (LWP 5496)):
[KCrash Handler]
#6  0x00007fd031795057 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fd03173f011 in QV4::ExecutionEngine::~ExecutionEngine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fd03187d9d5 in QV8Engine::~QV8Engine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007fd03187dbb9 in QV8Engine::~QV8Engine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007fd0316dbf21 in QJSEngine::~QJSEngine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007fd0317dfbc5 in QQmlEngine::~QQmlEngine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#12 0x00007fd0317dfc99 in QQmlEngine::~QQmlEngine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#13 0x00007fd02846dc22 in cleanup (pointer=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qscopedpointer.h:54
#14 reset (other=0x0, this=0x7fd0286fb6c8 <Aurorae::Helper::instance()::s_helper+8>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qscopedpointer.h:149
#15 Aurorae::Helper::unref (this=0x7fd0286fb6c0 <Aurorae::Helper::instance()::s_helper>) at ../../../../clients/aurorae/src/aurorae.cpp:119
#16 0x00007fd028471948 in unref (this=<optimized out>) at ../../../../clients/aurorae/src/aurorae.cpp:273
#17 Aurorae::Decoration::~Decoration (this=0x21b8b20, __in_chrg=<optimized out>) at ../../../../clients/aurorae/src/aurorae.cpp:267
#18 0x00007fd028471969 in Aurorae::Decoration::~Decoration (this=0x21b8b20, __in_chrg=<optimized out>) at ../../../../clients/aurorae/src/aurorae.cpp:280
#19 0x00007fd04e559708 in QObject::event (this=0x21b8b20, e=<optimized out>) at kernel/qobject.cpp:1236
#20 0x00007fd04f3182ec in QApplicationPrivate::notify_helper (this=0x167c680, receiver=0x21b8b20, e=0x2963070) at kernel/qapplication.cpp:3722
#21 0x00007fd04f31d960 in QApplication::notify (this=0x7fff9fbd2280, receiver=0x21b8b20, e=0x2963070) at kernel/qapplication.cpp:3505
#22 0x00007fd04e527bdb in QCoreApplication::notifyInternal (this=0x7fff9fbd2280, receiver=0x21b8b20, event=event@entry=0x2963070) at kernel/qcoreapplication.cpp:932
#23 0x00007fd04e529c4b in sendEvent (event=0x2963070, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#24 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=52, data=0x167bdb0) at kernel/qcoreapplication.cpp:1536
#25 0x00007fd031b4492e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#26 0x00007fd031b76213 in QQuickWindow::~QQuickWindow() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#27 0x00007fd031c25029 in QQuickView::~QQuickView() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#28 0x00007fd04f376fb5 in QWindowContainer::~QWindowContainer (this=0x36033b0, __in_chrg=<optimized out>) at kernel/qwindowcontainer.cpp:219
#29 0x00007fd04f376fd9 in QWindowContainer::~QWindowContainer (this=0x36033b0, __in_chrg=<optimized out>) at kernel/qwindowcontainer.cpp:220
#30 0x00007fd04e55711c in QObjectPrivate::deleteChildren (this=this@entry=0x20b96a0) at kernel/qobject.cpp:1950
#31 0x00007fd04f357c2a in QWidget::~QWidget (this=0x20e2fc0, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1642
#32 0x00007fd04f357e99 in QWidget::~QWidget (this=0x20e2fc0, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1662
#33 0x00007fd04e55711c in QObjectPrivate::deleteChildren (this=this@entry=0x39a52b0) at kernel/qobject.cpp:1950
#34 0x00007fd04f357c2a in QWidget::~QWidget (this=0x2006d80, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1642
#35 0x00007fd02bdf54fe in ~ConfigurationForm (this=0x2006d80, __in_chrg=<optimized out>) at ../../../kcmkwin/kwindecoration/kcm.h:41
#36 KDecoration2::Configuration::ConfigurationForm::~ConfigurationForm (this=0x2006d80, __in_chrg=<optimized out>) at ../../../kcmkwin/kwindecoration/kcm.h:41
#37 0x00007fd04e55711c in QObjectPrivate::deleteChildren (this=this@entry=0x2055c80) at kernel/qobject.cpp:1950
#38 0x00007fd04f357c2a in QWidget::~QWidget (this=0x2056800, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1642
#39 0x00007fd04fdfb1f7 in KCModule::~KCModule (this=0x2056800, __in_chrg=<optimized out>) at ../../src/kcmodule.cpp:164
#40 0x00007fd02bdf01a1 in ~ConfigurationModule (this=0x2056800, __in_chrg=<optimized out>) at ../../../kcmkwin/kwindecoration/kcm.h:47
#41 KDecoration2::Configuration::ConfigurationModule::~ConfigurationModule (this=0x2056800, __in_chrg=<optimized out>) at ../../../kcmkwin/kwindecoration/kcm.h:47
#42 0x00007fd0510843f4 in KCModuleProxy::deleteClient (this=this@entry=0x31a9550) at ../../src/kcmoduleproxy.cpp:217
#43 0x00007fd0510844f6 in KCModuleProxy::~KCModuleProxy (this=0x31a9550, __in_chrg=<optimized out>) at ../../src/kcmoduleproxy.cpp:208
#44 0x00007fd051084609 in KCModuleProxy::~KCModuleProxy (this=0x31a9550, __in_chrg=<optimized out>) at ../../src/kcmoduleproxy.cpp:212
#45 0x00007fd04e55711c in QObjectPrivate::deleteChildren (this=this@entry=0x20d5880) at kernel/qobject.cpp:1950
#46 0x00007fd04f357c2a in QWidget::~QWidget (this=0x2232510, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1642
#47 0x00007fd04f357e99 in QWidget::~QWidget (this=0x2232510, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1662
#48 0x00007fd04e55711c in QObjectPrivate::deleteChildren (this=this@entry=0x2041d20) at kernel/qobject.cpp:1950
#49 0x00007fd04f357c2a in QWidget::~QWidget (this=0x2115cc0, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1642
#50 0x00007fd04f4e60d9 in QScrollArea::~QScrollArea (this=0x2115cc0, __in_chrg=<optimized out>) at widgets/qscrollarea.cpp:168
#51 0x00007fd04f9403f3 in ~Private (this=0x31a9490, __in_chrg=<optimized out>) at ../../src/kpagewidgetmodel.cpp:40
#52 KPageWidgetItem::~KPageWidgetItem (this=0x31a9160, __in_chrg=<optimized out>) at ../../src/kpagewidgetmodel.cpp:86
#53 0x00007fd04f940de4 in ~KPageWidgetItem (this=0x31a9160, __in_chrg=<optimized out>) at ../../src/kpagewidgetmodel.cpp:87
#54 PageItem::~PageItem (this=0x18ca440, __in_chrg=<optimized out>) at ../../src/kpagewidgetmodel.cpp:176
#55 0x00007fd04f942018 in KPageWidgetModel::removePage (this=0x1880680, item=<optimized out>) at ../../src/kpagewidgetmodel.cpp:537
#56 0x00007fd04f93ff47 in KPageWidget::removePage (this=<optimized out>, item=<optimized out>) at ../../src/kpagewidget.cpp:120
#57 0x00007fd0512b7875 in ModuleView::closeModules (this=0x1fa20a0) at ../../core/ModuleView.cpp:275
#58 0x00007fd0335275ce in IconMode::backToOverview (this=0x18a7210) at ../../icons/IconMode.cpp:156
#59 0x00007fd04e558959 in QMetaObject::activate (sender=sender@entry=0x189e830, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7fff9fbd14b0) at kernel/qobject.cpp:3716
#60 0x00007fd04e558fe7 in QMetaObject::activate (sender=sender@entry=0x189e830, m=m@entry=0x7fd04f82df40 <QAction::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7fff9fbd14b0) at kernel/qobject.cpp:3582
#61 0x00007fd04f30ded2 in QAction::triggered (this=this@entry=0x189e830, _t1=false) at .moc/moc_qaction.cpp:360
#62 0x00007fd04f3105d8 in QAction::activate (this=0x189e830, event=<optimized out>) at kernel/qaction.cpp:1167
#63 0x00007fd04f41443d in QAbstractButtonPrivate::click (this=0x1ffe400) at widgets/qabstractbutton.cpp:516
#64 0x00007fd04f414654 in QAbstractButton::mouseReleaseEvent (this=0x1ffe1e0, e=0x7fff9fbd19b0) at widgets/qabstractbutton.cpp:1132
#65 0x00007fd04f4e02ba in QToolButton::mouseReleaseEvent (this=<optimized out>, e=<optimized out>) at widgets/qtoolbutton.cpp:609
#66 0x00007fd04f35b898 in QWidget::event (this=0x1ffe1e0, event=0x7fff9fbd19b0) at kernel/qwidget.cpp:9022
#67 0x00007fd04f415973 in QAbstractButton::event (this=this@entry=0x1ffe1e0, e=e@entry=0x7fff9fbd19b0) at widgets/qabstractbutton.cpp:1089
#68 0x00007fd04f4e0399 in QToolButton::event (this=0x1ffe1e0, event=0x7fff9fbd19b0) at widgets/qtoolbutton.cpp:965
#69 0x00007fd04f3182ec in QApplicationPrivate::notify_helper (this=0x167c680, receiver=0x1ffe1e0, e=0x7fff9fbd19b0) at kernel/qapplication.cpp:3722
#70 0x00007fd04f31df9e in QApplication::notify (this=0x7fff9fbd16f0, receiver=0x7fff9fbd1710, e=0x7fff9fbd19b0) at kernel/qapplication.cpp:3280
#71 0x00007fd04e527bdb in QCoreApplication::notifyInternal (this=0x7fff9fbd2280, receiver=receiver@entry=0x1ffe1e0, event=event@entry=0x7fff9fbd19b0) at kernel/qcoreapplication.cpp:932
#72 0x00007fd04f31cb6a in sendSpontaneousEvent (event=0x7fff9fbd19b0, receiver=0x1ffe1e0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#73 QApplicationPrivate::sendMouseEvent (receiver=0x1ffe1e0, event=0x7fff9fbd19b0, alienWidget=0x1ffe1e0, nativeWidget=0x1753880, buttonDown=<optimized out>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:2751
#74 0x00007fd04f373ea0 in QWidgetWindow::handleMouseEvent (this=0x182cd20, event=0x7fff9fbd1dc0) at kernel/qwidgetwindow.cpp:506
#75 0x00007fd04f376013 in QWidgetWindow::event (this=0x182cd20, event=0x7fff9fbd1dc0) at kernel/qwidgetwindow.cpp:173
#76 0x00007fd04f3182ec in QApplicationPrivate::notify_helper (this=0x167c680, receiver=0x182cd20, e=0x7fff9fbd1dc0) at kernel/qapplication.cpp:3722
#77 0x00007fd04f31d960 in QApplication::notify (this=0x7fff9fbd2280, receiver=0x182cd20, e=0x7fff9fbd1dc0) at kernel/qapplication.cpp:3505
#78 0x00007fd04e527bdb in QCoreApplication::notifyInternal (this=0x7fff9fbd2280, receiver=0x182cd20, event=0x7fff9fbd1dc0) at kernel/qcoreapplication.cpp:932
#79 0x00007fd04ed5cdc2 in sendSpontaneousEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#80 QGuiApplicationPrivate::processMouseEvent (e=0x2084b50) at kernel/qguiapplication.cpp:1799
#81 0x00007fd04ed5e8d5 in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x2084b50) at kernel/qguiapplication.cpp:1601
#82 0x00007fd04ed431af in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:572
#83 0x00007fd04475e560 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#84 0x00007fd04b3a8c3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#85 0x00007fd04b3a8f20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#86 0x00007fd04b3a8fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#87 0x00007fd04e580ab7 in QEventDispatcherGlib::processEvents (this=0x16bedb0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#88 0x00007fd04e525392 in QEventLoop::exec (this=this@entry=0x7fff9fbd2160, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#89 0x00007fd04e52cfdc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1185
#90 0x00007fd04ed5419c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1535
#91 0x00007fd04f313f55 in QApplication::exec () at kernel/qapplication.cpp:2956
#92 0x000000000040eebc in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:54

Reported using DrKonqi