Bug 403202

Application: kwin_x11 (5.14.4)

Qt Version: 5.12.0
Frameworks Version: 5.53.0
Operating System: Linux 4.19.8-arch1-1-ARCH x86_64
Distribution: "Antergos Linux"

-- Information about the crash:
- What I was doing when the application crashed:
Added a new worspace via the "+" button in the workspace overview.

- Unusual behavior I noticed:
Kwin crashed, apparently with a segfault.

- Custom settings of the application:
I normally have 6 workspaces set up. Dual monitor setup.

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7ff7b84cd840 (LWP 1938))]

Thread 9 (Thread 0x7ff7ade0f700 (LWP 7830)):
#0  0x00007ff7ba210d16 in ppoll () at /usr/lib/libc.so.6
#1  0x00007ff7b8d9446b in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007ff7b8d9594b in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007ff7b8d4158c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ff7b8b855c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007ff7b70c4b89 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007ff7b8b869cc in  () at /usr/lib/libQt5Core.so.5
#7  0x00007ff7b790fa9d in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007ff7ba21bb23 in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7ff6fed97700 (LWP 3327)):
#0  0x00007ff7ba210d16 in ppoll () at /usr/lib/libc.so.6
#1  0x00007ff7b8d9446b in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007ff7b8d9594b in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007ff7b8d4158c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ff7b8b855c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007ff7b70c4b89 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007ff7b8b869cc in  () at /usr/lib/libQt5Core.so.5
#7  0x00007ff7b790fa9d in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007ff7ba21bb23 in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7ff79ffff700 (LWP 3326)):
#0  0x00007ff7ba210d16 in ppoll () at /usr/lib/libc.so.6
#1  0x00007ff7b8d9446b in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007ff7b8d9594b in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007ff7b8d4158c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ff7b8b855c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007ff7b70c4b89 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007ff7b8b869cc in  () at /usr/lib/libQt5Core.so.5
#7  0x00007ff7b790fa9d in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007ff7ba21bb23 in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7ff783fff700 (LWP 2049)):
#0  0x00007ff7b7915afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007ff7b866128c in  () at /usr/lib/libQt5Script.so.5
#2  0x00007ff7b86612a9 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007ff7b790fa9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007ff7ba21bb23 in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7ff79d84f700 (LWP 2041)):
#0  0x00007ff7b7915afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007ff79ed88004 in  () at /usr/lib/dri/r600_dri.so
#2  0x00007ff79ed87d28 in  () at /usr/lib/dri/r600_dri.so
#3  0x00007ff7b790fa9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007ff7ba21bb23 in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7ff79e197700 (LWP 2040)):
#0  0x00007ff7b7915afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007ff79ed88004 in  () at /usr/lib/dri/r600_dri.so
#2  0x00007ff79ed87d28 in  () at /usr/lib/dri/r600_dri.so
#3  0x00007ff7b790fa9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007ff7ba21bb23 in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7ff7ad5bf700 (LWP 2015)):
#0  0x00007ff7ba229183 in __libc_enable_asynccancel () at /usr/lib/libc.so.6
#1  0x00007ff7ba210cf4 in ppoll () at /usr/lib/libc.so.6
#2  0x00007ff7b8d9446b in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#3  0x00007ff7b8d9594b in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ff7b8d4158c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007ff7b8b855c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007ff7b70c4b89 in  () at /usr/lib/libQt5Qml.so.5
#7  0x00007ff7b8b869cc in  () at /usr/lib/libQt5Core.so.5
#8  0x00007ff7b790fa9d in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007ff7ba21bb23 in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7ff7af087700 (LWP 1993)):
#0  0x00007ff7ba210d16 in ppoll () at /usr/lib/libc.so.6
#1  0x00007ff7b8d9446b in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007ff7b8d9594b in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007ff7b8d4158c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007ff7b8b855c9 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007ff7b6b1cba6 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007ff7b8b869cc in  () at /usr/lib/libQt5Core.so.5
#7  0x00007ff7b790fa9d in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007ff7ba21bb23 in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7ff7b84cd840 (LWP 1938)):
[KCrash Handler]
#6  0x00007ff7b880ebf8 in  () at /usr/lib/libkwin4_effect_builtins.so.1
#7  0x00007ff7b880ec7c in  () at /usr/lib/libkwin4_effect_builtins.so.1
#8  0x00007ff7b8808690 in  () at /usr/lib/libkwin4_effect_builtins.so.1
#9  0x00007ff7b8888ec1 in  () at /usr/lib/libkwin4_effect_builtins.so.1
#10 0x00007ff7b8d6d28c in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#11 0x00007ff7b88f4d28 in KWin::EffectsHandler::windowGeometryShapeChanged(KWin::EffectWindow*, QRect const&) () at /usr/lib/libkwineffects.so.11
#12 0x00007ff7b8d6d3e0 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#13 0x00007ff7ba04ee38 in KWin::Toplevel::geometryShapeChanged(KWin::Toplevel*, QRect const&) () at /usr/lib/libkwin.so.5
#14 0x00007ff7b9ecb830 in KWin::Client::updateShape() () at /usr/lib/libkwin.so.5
#15 0x00007ff7b9f5ad5a in KWin::Client::setGeometry(int, int, int, int, KWin::AbstractClient::ForceGeometry_t) () at /usr/lib/libkwin.so.5
#16 0x00007ff7b9f5c5a6 in KWin::AbstractClient::blockGeometryUpdates(bool) () at /usr/lib/libkwin.so.5
#17 0x00007ff7b9f5d1cb in KWin::Client::changeMaximize(bool, bool, bool) () at /usr/lib/libkwin.so.5
#18 0x00007ff7b9f60ce6 in KWin::AbstractClient::checkWorkspacePosition(QRect, int, QRect) () at /usr/lib/libkwin.so.5
#19 0x00007ff7b9f66325 in KWin::Workspace::updateClientArea(bool) () at /usr/lib/libkwin.so.5
#20 0x00007ff7b8d6d28c in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#21 0x00007ff7ba04f32d in KWin::VirtualDesktopManager::countChanged(unsigned int, unsigned int) () at /usr/lib/libkwin.so.5
#22 0x00007ff7b9fae688 in KWin::VirtualDesktopManager::setCount(unsigned int) () at /usr/lib/libkwin.so.5
#23 0x00007ff7b8888e76 in  () at /usr/lib/libkwin4_effect_builtins.so.1
#24 0x00007ff7b8d6d28c in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#25 0x00007ff7b8d6d28c in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#26 0x00007ff7b7012c63 in QQmlVMEMetaObject::metaCall(QObject*, QMetaObject::Call, int, void**) () at /usr/lib/libQt5Qml.so.5
#27 0x00007ff7b7012606 in QQmlVMEMetaObject::metaCall(QObject*, QMetaObject::Call, int, void**) () at /usr/lib/libQt5Qml.so.5
#28 0x00007ff7b7012606 in QQmlVMEMetaObject::metaCall(QObject*, QMetaObject::Call, int, void**) () at /usr/lib/libQt5Qml.so.5
#29 0x00007ff7b706b1ae in  () at /usr/lib/libQt5Qml.so.5
#30 0x00007ff7b6f6bd1c in  () at /usr/lib/libQt5Qml.so.5
#31 0x00007ff7b6f6d099 in  () at /usr/lib/libQt5Qml.so.5
#32 0x00007ff7b6f6dd4f in QV4::QObjectMethod::callInternal(QV4::Value const*, QV4::Value const*, int) const () at /usr/lib/libQt5Qml.so.5
#33 0x00007ff7b6ff4ef5 in QV4::Runtime::method_callProperty(QV4::ExecutionEngine*, QV4::Value*, int, QV4::Value*, int) () at /usr/lib/libQt5Qml.so.5
#34 0x00007ff7b6f87f65 in  () at /usr/lib/libQt5Qml.so.5
#35 0x00007ff7b6f8c01f in  () at /usr/lib/libQt5Qml.so.5
#36 0x00007ff7b6f1dfbc in QV4::Function::call(QV4::Value const*, QV4::Value const*, int, QV4::ExecutionContext const*) () at /usr/lib/libQt5Qml.so.5
#37 0x00007ff7b7092538 in QQmlJavaScriptExpression::evaluate(QV4::CallData*, bool*) () at /usr/lib/libQt5Qml.so.5
#38 0x00007ff7b7034ab8 in QQmlBoundSignalExpression::evaluate(void**) () at /usr/lib/libQt5Qml.so.5
#39 0x00007ff7b7035c6c in  () at /usr/lib/libQt5Qml.so.5
#40 0x00007ff7b7075b53 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () at /usr/lib/libQt5Qml.so.5
#41 0x00007ff7b7016ea4 in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) () at /usr/lib/libQt5Qml.so.5
#42 0x00007ff7b8d6cbaf in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#43 0x00007ff6feea8270 in  () at /usr/lib/qt/qml/QtQuick/Controls/libqtquickcontrolsplugin.so
#44 0x00007ff6feea877d in  () at /usr/lib/qt/qml/QtQuick/Controls/libqtquickcontrolsplugin.so
#45 0x00007ff6feea8db3 in  () at /usr/lib/qt/qml/QtQuick/Controls/libqtquickcontrolsplugin.so
#46 0x00007ff7b706b1ae in  () at /usr/lib/libQt5Qml.so.5
#47 0x00007ff7b6f6ba42 in  () at /usr/lib/libQt5Qml.so.5
#48 0x00007ff7b6f6d0c5 in  () at /usr/lib/libQt5Qml.so.5
#49 0x00007ff7b6f6e13a in QV4::QObjectMethod::callInternal(QV4::Value const*, QV4::Value const*, int) const () at /usr/lib/libQt5Qml.so.5
#50 0x00007ff7b6ff4ef5 in QV4::Runtime::method_callProperty(QV4::ExecutionEngine*, QV4::Value*, int, QV4::Value*, int) () at /usr/lib/libQt5Qml.so.5
#51 0x00007ff7b6f87f65 in  () at /usr/lib/libQt5Qml.so.5
#52 0x00007ff7b6f8c01f in  () at /usr/lib/libQt5Qml.so.5
#53 0x00007ff7b6f1dfbc in QV4::Function::call(QV4::Value const*, QV4::Value const*, int, QV4::ExecutionContext const*) () at /usr/lib/libQt5Qml.so.5
#54 0x00007ff7b7092538 in QQmlJavaScriptExpression::evaluate(QV4::CallData*, bool*) () at /usr/lib/libQt5Qml.so.5
#55 0x00007ff7b7034ab8 in QQmlBoundSignalExpression::evaluate(void**) () at /usr/lib/libQt5Qml.so.5
#56 0x00007ff7b7035c6c in  () at /usr/lib/libQt5Qml.so.5
#57 0x00007ff7b7075b53 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () at /usr/lib/libQt5Qml.so.5
#58 0x00007ff7b7016ea4 in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) () at /usr/lib/libQt5Qml.so.5
#59 0x00007ff7b8d6cbaf in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#60 0x00007ff7b75287b3 in QQuickMouseArea::released(QQuickMouseEvent*) () at /usr/lib/libQt5Quick.so.5
#61 0x00007ff7b752a03d in QQuickMouseArea::setPressed(Qt::MouseButton, bool, Qt::MouseEventSource) () at /usr/lib/libQt5Quick.so.5
#62 0x00007ff7b752b2c2 in QQuickMouseArea::mouseReleaseEvent(QMouseEvent*) () at /usr/lib/libQt5Quick.so.5
#63 0x00007ff7b74904f8 in QQuickItem::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#64 0x00007ff7b970fe34 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#65 0x00007ff7b9717671 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#66 0x00007ff7b8d428f9 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#67 0x00007ff7b74aaf61 in QQuickWindowPrivate::deliverMouseEvent(QQuickPointerMouseEvent*) () at /usr/lib/libQt5Quick.so.5
#68 0x00007ff7b74ac20c in QQuickWindowPrivate::deliverPointerEvent(QQuickPointerEvent*) () at /usr/lib/libQt5Quick.so.5
#69 0x00007ff7b74acf79 in QQuickWindowPrivate::handleMouseEvent(QMouseEvent*) () at /usr/lib/libQt5Quick.so.5
#70 0x00007ff7b880cb49 in  () at /usr/lib/libkwin4_effect_builtins.so.1
#71 0x00007ff7b9f9becf in KWin::EffectsHandlerImpl::checkInputWindowEvent(QMouseEvent*) () at /usr/lib/libkwin.so.5
#72 0x00007ff7af0b2da1 in  () at /usr/lib/qt/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#73 0x00007ff7b9f2ba39 in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /usr/lib/libkwin.so.5
#74 0x00007ff7b8d403bf in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/libQt5Core.so.5
#75 0x00007ff7b09b8cc2 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/libQt5XcbQpa.so.5
#76 0x00007ff7b09b9a54 in QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5XcbQpa.so.5
#77 0x00007ff7b09e4d5e in  () at /usr/lib/libQt5XcbQpa.so.5
#78 0x00007ff7b8d4158c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#79 0x00007ff7b8d49896 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#80 0x00007ff7ba2f1b26 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#81 0x00007ff7ba144223 in __libc_start_main () at /usr/lib/libc.so.6
#82 0x000055baeacce05e in _start ()
[Inferior 1 (process 1938) detached]

Reported using DrKonqi