Bug 347722

Application: systemsettings5 (5.3.0)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-16-generic x86_64
Distribution: Ubuntu 15.04

-- Information about the crash:
- What I was doing when the application crashed:

Just clicked the back button to return to main systemsettings view. It happened to me twice, when I played with themes.
Plasma 5.3, installed from ppa:kubuntu-ppa/backports

The crash can be reproduced sometimes.

-- 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 0x7f5c7d3f8780 (LWP 19024))]

Thread 3 (Thread 0x7f5c5ca42700 (LWP 19029)):
#0  0x00007f5c79b728dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f5c76887ebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5c76887fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5c7a48ac6c in QEventDispatcherGlib::processEvents (this=0x7f5c580008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007f5c7a42f3e2 in QEventLoop::exec (this=this@entry=0x7f5c5ca41e20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f5c7a1eeb44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f5c791b9f65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f5c7a1f3b0e in QThreadPrivate::start (arg=0x1095e40) at thread/qthread_unix.cpp:337
#8  0x00007f5c76da66aa in start_thread (arg=0x7f5c5ca42700) at pthread_create.c:333
#9  0x00007f5c79b7deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f5c4fbc3700 (LWP 19055)):
#0  0x00007f5c7a1eb9ca in testAndSetRelaxed<QMutexData*> (currentValue=<synthetic pointer>, newValue=0x1, expectedValue=0x0, _q_value=@0x2ab6438: 0x1) at ../../include/QtCore/../../src/corelib/arch/qatomic_x86.h:259
#1  testAndSetAcquire<QMutexData*, QMutexData*> (currentValue=<synthetic pointer>, newValue=0x1, expectedValue=0x0, _q_value=@0x2ab6438: 0x1) at ../../include/QtCore/../../src/corelib/thread/qgenericatomic.h:166
#2  testAndSetAcquire (currentValue=<synthetic pointer>, newValue=0x1, expectedValue=0x0, this=0x2ab6438, this@entry=0x1) at ../../include/QtCore/../../src/corelib/thread/qbasicatomic.h:270
#3  fastTryLock (current=<synthetic pointer>, this=0x2ab6438, this@entry=0x1) at thread/qmutex.h:82
#4  QMutex::lock (this=this@entry=0x2ab6438) at thread/qmutex.cpp:212
#5  0x00007f5c7a48a1db in QMutexLocker (m=0x2ab6438, this=<synthetic pointer>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:128
#6  canWaitLocked (this=0x2ab6410) at ../../include/QtCore/5.4.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:243
#7  postEventSourcePrepare (s=0x7f5c480012d0, timeout=0x7f5c4fbc2c54) at kernel/qeventdispatcher_glib.cpp:254
#8  0x00007f5c768873fd in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007f5c76887de8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f5c76887fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f5c7a48ac6c in QEventDispatcherGlib::processEvents (this=0x7f5c480008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#12 0x00007f5c7a42f3e2 in QEventLoop::exec (this=this@entry=0x7f5c4fbc2e20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#13 0x00007f5c7a1eeb44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#14 0x00007f5c791b9f65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#15 0x00007f5c7a1f3b0e in QThreadPrivate::start (arg=0x2ab62d0) at thread/qthread_unix.cpp:337
#16 0x00007f5c76da66aa in start_thread (arg=0x7f5c4fbc3700) at pthread_create.c:333
#17 0x00007f5c79b7deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f5c7d3f8780 (LWP 19024)):
[KCrash Handler]
#6  0x00007f5c790daf97 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f5c79085151 in QV4::ExecutionEngine::~ExecutionEngine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f5c791bd0d5 in QV8Engine::~QV8Engine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f5c791bd2b9 in QV8Engine::~QV8Engine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f5c79022061 in QJSEngine::~QJSEngine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007f5c7911f3c5 in QQmlEngine::~QQmlEngine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#12 0x00007f5c7911f499 in QQmlEngine::~QQmlEngine() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#13 0x00007f5c4e162242 in cleanup (pointer=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qscopedpointer.h:54
#14 reset (other=0x0, this=0x7f5c4e3f1708 <Aurorae::Helper::instance()::s_helper+8>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qscopedpointer.h:149
#15 Aurorae::Helper::unref (this=0x7f5c4e3f1700 <Aurorae::Helper::instance()::s_helper>) at ../../../../clients/aurorae/src/aurorae.cpp:113
#16 0x00007f5c4e1663f8 in unref (this=<optimized out>) at ../../../../clients/aurorae/src/aurorae.cpp:271
#17 Aurorae::Decoration::~Decoration (this=0x15ee270, __in_chrg=<optimized out>) at ../../../../clients/aurorae/src/aurorae.cpp:266
#18 0x00007f5c4e166419 in Aurorae::Decoration::~Decoration (this=0x15ee270, __in_chrg=<optimized out>) at ../../../../clients/aurorae/src/aurorae.cpp:277
#19 0x00007f5c7a463778 in QObject::event (this=0x15ee270, e=<optimized out>) at kernel/qobject.cpp:1236
#20 0x00007f5c7b21db2c in QApplicationPrivate::notify_helper (this=0xc48b10, receiver=0x15ee270, e=0x1a0aea0) at kernel/qapplication.cpp:3720
#21 0x00007f5c7b223000 in QApplication::notify (this=0x7ffdf5d1e950, receiver=0x15ee270, e=0x1a0aea0) at kernel/qapplication.cpp:3503
#22 0x00007f5c7a431c2b in QCoreApplication::notifyInternal (this=0x7ffdf5d1e950, receiver=0x15ee270, event=event@entry=0x1a0aea0) at kernel/qcoreapplication.cpp:935
#23 0x00007f5c7a433c9b in sendEvent (event=0x1a0aea0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#24 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=52, data=0xc47d60) at kernel/qcoreapplication.cpp:1552
#25 0x00007f5c78c62b6e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#26 0x00007f5c78c94463 in QQuickWindow::~QQuickWindow() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#27 0x00007f5c78d43a49 in QQuickView::~QQuickView() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#28 0x00007f5c7b27cdd5 in QWindowContainer::~QWindowContainer (this=0x13c8550, __in_chrg=<optimized out>) at kernel/qwindowcontainer.cpp:219
#29 0x00007f5c7b27cdf9 in QWindowContainer::~QWindowContainer (this=0x13c8550, __in_chrg=<optimized out>) at kernel/qwindowcontainer.cpp:220
#30 0x00007f5c7a46118c in QObjectPrivate::deleteChildren (this=this@entry=0x2aaca30) at kernel/qobject.cpp:1950
#31 0x00007f5c7b25d57a in QWidget::~QWidget (this=0x2aac9f0, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1642
#32 0x00007f5c7b25d7e9 in QWidget::~QWidget (this=0x2aac9f0, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1662
#33 0x00007f5c7a46118c in QObjectPrivate::deleteChildren (this=this@entry=0x26a7d30) at kernel/qobject.cpp:1950
#34 0x00007f5c7b25d57a in QWidget::~QWidget (this=0x2a9a280, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1642
#35 0x00007f5c4fdf54fe in ~ConfigurationForm (this=0x2a9a280, __in_chrg=<optimized out>) at ../../../kcmkwin/kwindecoration/kcm.h:41
#36 KDecoration2::Configuration::ConfigurationForm::~ConfigurationForm (this=0x2a9a280, __in_chrg=<optimized out>) at ../../../kcmkwin/kwindecoration/kcm.h:41
#37 0x00007f5c7a46118c in QObjectPrivate::deleteChildren (this=this@entry=0x2ae46d0) at kernel/qobject.cpp:1950
#38 0x00007f5c7b25d57a in QWidget::~QWidget (this=0x26441b0, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1642
#39 0x00007f5c7bd011c7 in KCModule::~KCModule (this=0x26441b0, __in_chrg=<optimized out>) at ../../src/kcmodule.cpp:177
#40 0x00007f5c4fdf01a1 in ~ConfigurationModule (this=0x26441b0, __in_chrg=<optimized out>) at ../../../kcmkwin/kwindecoration/kcm.h:47
#41 KDecoration2::Configuration::ConfigurationModule::~ConfigurationModule (this=0x26441b0, __in_chrg=<optimized out>) at ../../../kcmkwin/kwindecoration/kcm.h:47
#42 0x00007f5c7cf84e34 in KCModuleProxy::deleteClient (this=this@entry=0x2b0ccc0) at ../../src/kcmoduleproxy.cpp:217
#43 0x00007f5c7cf84f36 in KCModuleProxy::~KCModuleProxy (this=0x2b0ccc0, __in_chrg=<optimized out>) at ../../src/kcmoduleproxy.cpp:208
#44 0x00007f5c7cf85049 in KCModuleProxy::~KCModuleProxy (this=0x2b0ccc0, __in_chrg=<optimized out>) at ../../src/kcmoduleproxy.cpp:212
#45 0x00007f5c7a46118c in QObjectPrivate::deleteChildren (this=this@entry=0x2b0ac40) at kernel/qobject.cpp:1950
#46 0x00007f5c7b25d57a in QWidget::~QWidget (this=0x2ab7fb0, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1642
#47 0x00007f5c7b25d7e9 in QWidget::~QWidget (this=0x2ab7fb0, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1662
#48 0x00007f5c7a46118c in QObjectPrivate::deleteChildren (this=this@entry=0x2b0a9a0) at kernel/qobject.cpp:1950
#49 0x00007f5c7b25d57a in QWidget::~QWidget (this=0x2b698c0, __in_chrg=<optimized out>) at kernel/qwidget.cpp:1642
#50 0x00007f5c7b3ec059 in QScrollArea::~QScrollArea (this=0x2b698c0, __in_chrg=<optimized out>) at widgets/qscrollarea.cpp:168
#51 0x00007f5c7b847213 in ~Private (this=0x2b0cc60, __in_chrg=<optimized out>) at ../../src/kpagewidgetmodel.cpp:40
#52 KPageWidgetItem::~KPageWidgetItem (this=0x2b0cb10, __in_chrg=<optimized out>) at ../../src/kpagewidgetmodel.cpp:86
#53 0x00007f5c7b847bf4 in ~KPageWidgetItem (this=0x2b0cb10, __in_chrg=<optimized out>) at ../../src/kpagewidgetmodel.cpp:87
#54 PageItem::~PageItem (this=0x1473200, __in_chrg=<optimized out>) at ../../src/kpagewidgetmodel.cpp:176
#55 0x00007f5c7b848e08 in KPageWidgetModel::removePage (this=0xf7d100, item=<optimized out>) at ../../src/kpagewidgetmodel.cpp:537
#56 0x00007f5c7b846d67 in KPageWidget::removePage (this=<optimized out>, item=<optimized out>) at ../../src/kpagewidget.cpp:120
#57 0x00007f5c7d1b8875 in ModuleView::closeModules (this=0xf773b0) at ../../core/ModuleView.cpp:275
#58 0x00007f5c5e06f5ce in IconMode::backToOverview (this=0xf75530) at ../../icons/IconMode.cpp:156
#59 0x00007f5c7a4629c9 in QMetaObject::activate (sender=sender@entry=0xf75e10, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7ffdf5d1db80) at kernel/qobject.cpp:3716
#60 0x00007f5c7a463057 in QMetaObject::activate (sender=sender@entry=0xf75e10, m=m@entry=0x7f5c7b734b40 <QAction::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7ffdf5d1db80) at kernel/qobject.cpp:3582
#61 0x00007f5c7b213722 in QAction::triggered (this=this@entry=0xf75e10, _t1=false) at .moc/moc_qaction.cpp:360
#62 0x00007f5c7b215e28 in QAction::activate (this=0xf75e10, event=<optimized out>) at kernel/qaction.cpp:1167
#63 0x00007f5c7b31a23d in QAbstractButtonPrivate::click (this=0xfec8c0) at widgets/qabstractbutton.cpp:516
#64 0x00007f5c7b31a454 in QAbstractButton::mouseReleaseEvent (this=0xfec4e0, e=0x7ffdf5d1e080) at widgets/qabstractbutton.cpp:1132
#65 0x00007f5c7b3e623a in QToolButton::mouseReleaseEvent (this=<optimized out>, e=<optimized out>) at widgets/qtoolbutton.cpp:609
#66 0x00007f5c7b2611e8 in QWidget::event (this=0xfec4e0, event=0x7ffdf5d1e080) at kernel/qwidget.cpp:9022
#67 0x00007f5c7b31b773 in QAbstractButton::event (this=this@entry=0xfec4e0, e=e@entry=0x7ffdf5d1e080) at widgets/qabstractbutton.cpp:1089
#68 0x00007f5c7b3e6319 in QToolButton::event (this=0xfec4e0, event=0x7ffdf5d1e080) at widgets/qtoolbutton.cpp:965
#69 0x00007f5c7b21db2c in QApplicationPrivate::notify_helper (this=0xc48b10, receiver=0xfec4e0, e=0x7ffdf5d1e080) at kernel/qapplication.cpp:3720
#70 0x00007f5c7b2238eb in QApplication::notify (this=0x7ffdf5d1ddc0, receiver=0x7ffdf5d1dde0, e=0x7ffdf5d1e080) at kernel/qapplication.cpp:3280
#71 0x00007f5c7a431c2b in QCoreApplication::notifyInternal (this=0x7ffdf5d1e950, receiver=receiver@entry=0xfec4e0, event=event@entry=0x7ffdf5d1e080) at kernel/qcoreapplication.cpp:935
#72 0x00007f5c7b2223da in sendSpontaneousEvent (event=0x7ffdf5d1e080, receiver=0xfec4e0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#73 QApplicationPrivate::sendMouseEvent (receiver=0xfec4e0, event=0x7ffdf5d1e080, alienWidget=0xfec4e0, nativeWidget=0xd5e630, buttonDown=<optimized out>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:2751
#74 0x00007f5c7b279cc0 in QWidgetWindow::handleMouseEvent (this=0xde5dc0, event=0x7ffdf5d1e490) at kernel/qwidgetwindow.cpp:543
#75 0x00007f5c7b27be33 in QWidgetWindow::event (this=0xde5dc0, event=0x7ffdf5d1e490) at kernel/qwidgetwindow.cpp:210
#76 0x00007f5c7b21db2c in QApplicationPrivate::notify_helper (this=0xc48b10, receiver=0xde5dc0, e=0x7ffdf5d1e490) at kernel/qapplication.cpp:3720
#77 0x00007f5c7b223000 in QApplication::notify (this=0x7ffdf5d1e950, receiver=0xde5dc0, e=0x7ffdf5d1e490) at kernel/qapplication.cpp:3503
#78 0x00007f5c7a431c2b in QCoreApplication::notifyInternal (this=0x7ffdf5d1e950, receiver=0xde5dc0, event=0x7ffdf5d1e490) at kernel/qcoreapplication.cpp:935
#79 0x00007f5c7ac60f82 in sendSpontaneousEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#80 QGuiApplicationPrivate::processMouseEvent (e=0x25f8d20) at kernel/qguiapplication.cpp:1774
#81 0x00007f5c7ac62b45 in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x25f8d20) at kernel/qguiapplication.cpp:1576
#82 0x00007f5c7ac4734f in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:572
#83 0x00007f5c6efcb590 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#84 0x00007f5c76887c3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#85 0x00007f5c76887f20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#86 0x00007f5c76887fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#87 0x00007f5c7a48ac57 in QEventDispatcherGlib::processEvents (this=0xcaa280, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#88 0x00007f5c7a42f3e2 in QEventLoop::exec (this=this@entry=0x7ffdf5d1e830, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#89 0x00007f5c7a43702c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#90 0x00007f5c7ac5831c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#91 0x00007f5c7b2197a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#92 0x000000000040ef5b in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:55

Reported using DrKonqi