Bug 403112

Summary:	Crash on Alt+Tab window switching
Product:	[Plasma] plasmashell	Reporter:	Vishnu <vishnugb>
Component:	general	Assignee:	David Edmundson <kde>
Status:	RESOLVED UPSTREAM
Severity:	crash	CC:	plasma-bugs-null
Priority:	NOR	Keywords:	drkonqi
Version First Reported In:	5.14.5
Target Milestone:	1.0
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Vishnu 2019-01-11 18:22:33 UTC

Application: plasmashell (5.14.5)

Qt Version: 5.12.0
Frameworks Version: 5.53.0
Operating System: Linux 4.20.0-artix1-1-ARTIX x86_64
Distribution (Platform): Archlinux Packages

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

I had a video playing in fullscreen, on Firefox. I was then attempting to switch windows using Alt+Tab

- Unusual behavior I noticed:

The switch was unsuccessful.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f5cf0bc3880 (LWP 10591))]

Thread 17 (Thread 0x7f5c79ffc700 (LWP 16568)):
#0  0x00007f5cf5015ef6 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5cf6114a09 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007f5cf6114b47 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007f5cf6112b64 in  () at /usr/lib/libQt5Core.so.5
#4  0x00007f5cf610e97c in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 16 (Thread 0x7f5c7affe700 (LWP 16566)):
#0  0x00007f5cf5015ef6 in pthread_cond_timedwait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5cf6114a09 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007f5cf6114b47 in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007f5cf6112b64 in  () at /usr/lib/libQt5Core.so.5
#4  0x00007f5cf610e97c in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 15 (Thread 0x7f5c99cf3700 (LWP 13266)):
#0  0x00007f5cf5015afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5cf6114a8c in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007f5cf6114b7a in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007f5cf7ebf4cd in  () at /usr/lib/libQt5Quick.so.5
#4  0x00007f5cf7ebf73c in  () at /usr/lib/libQt5Quick.so.5
#5  0x00007f5cf610e97c in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 14 (Thread 0x7f5cc4ff9700 (LWP 13248)):
#0  0x00007f5cf5015afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5cf6114a8c in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007f5cf6114b7a in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007f5cf7ebf4cd in  () at /usr/lib/libQt5Quick.so.5
#4  0x00007f5cf7ebf73c in  () at /usr/lib/libQt5Quick.so.5
#5  0x00007f5cf610e97c in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 13 (Thread 0x7f5c7bfff700 (LWP 12914)):
#0  0x00007f5cf5015afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5cf6114a8c in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007f5cf6114b7a in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007f5cf7ebf4cd in  () at /usr/lib/libQt5Quick.so.5
#4  0x00007f5cf7ebf73c in  () at /usr/lib/libQt5Quick.so.5
#5  0x00007f5cf610e97c in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 12 (Thread 0x7f5c9bfff700 (LWP 12362)):
#0  0x00007f5cf5015afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5cf6114a8c in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007f5cf6114b7a in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007f5cf7ebf4cd in  () at /usr/lib/libQt5Quick.so.5
#4  0x00007f5cf7ebf73c in  () at /usr/lib/libQt5Quick.so.5
#5  0x00007f5cf610e97c in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 11 (Thread 0x7f5c98956700 (LWP 11304)):
#0  0x00007f5cf5015afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5cf6114a8c in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007f5cf6114b7a in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007f5cf7ebf4cd in  () at /usr/lib/libQt5Quick.so.5
#4  0x00007f5cf7ebf73c in  () at /usr/lib/libQt5Quick.so.5
#5  0x00007f5cf610e97c in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7f5cc57fa700 (LWP 11150)):
#0  0x00007f5cf5015afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5cf6114a8c in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007f5cf6114b7a in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007f5cf7ebf4cd in  () at /usr/lib/libQt5Quick.so.5
#4  0x00007f5cf7ebf73c in  () at /usr/lib/libQt5Quick.so.5
#5  0x00007f5cf610e97c in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7f5ccccdc700 (LWP 11102)):
#0  0x00007f5cf5015afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5cf6114a8c in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007f5cf6114b7a in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007f5cf7ebf4cd in  () at /usr/lib/libQt5Quick.so.5
#4  0x00007f5cf7ebf73c in  () at /usr/lib/libQt5Quick.so.5
#5  0x00007f5cf610e97c in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7f5cc77fe700 (LWP 11092)):
#0  0x00007f5cf5015afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5cf6114a8c in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007f5cf6114b7a in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007f5cf7ebf4cd in  () at /usr/lib/libQt5Quick.so.5
#4  0x00007f5cf7ebf73c in  () at /usr/lib/libQt5Quick.so.5
#5  0x00007f5cf610e97c in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f5ca7fff700 (LWP 11066)):
#0  0x00007f5cf63209b9 in  () at /usr/lib/libQt5Core.so.5
#1  0x00007f5cf41d4fb2 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#2  0x00007f5cf41d64e6 in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f5cf41d662e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f5cf6320574 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f5cf62c953c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f5cf610d579 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f5ca451c35a in KCupsConnection::run() () at /usr/lib/libkcupslib.so
#8  0x00007f5cf610e97c in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f5cc5ffb700 (LWP 10928)):
#0  0x00007f5cf5015afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5cf6114a8c in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /usr/lib/libQt5Core.so.5
#2  0x00007f5cf6114b7a in QWaitCondition::wait(QMutex*, unsigned long) () at /usr/lib/libQt5Core.so.5
#3  0x00007f5cf7ebf4cd in  () at /usr/lib/libQt5Quick.so.5
#4  0x00007f5cf7ebf73c in  () at /usr/lib/libQt5Quick.so.5
#5  0x00007f5cf610e97c in  () at /usr/lib/libQt5Core.so.5
#6  0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f5ccf316700 (LWP 10772)):
#0  0x00007f5cf41d4d50 in  () at /usr/lib/libglib-2.0.so.0
#1  0x00007f5cf41d4ed2 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#2  0x00007f5cf41d64e6 in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f5cf41d662e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f5cf6320574 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f5cf62c953c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f5cf610d579 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f5cf610e97c in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f5ce7fff700 (LWP 10696)):
#0  0x00007f5cf5015afc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5cec73dc24 in  () at /usr/lib/dri/i965_dri.so
#2  0x00007f5cec73d948 in  () at /usr/lib/dri/i965_dri.so
#3  0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f5cee6dc700 (LWP 10673)):
#0  0x00007f5cf5de97a4 in read () at /usr/lib/libc.so.6
#1  0x00007f5cf4184971 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f5cf41d50b0 in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007f5cf41d64e6 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f5cf41d662e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007f5cf6320574 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f5cf62c953c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007f5cf610d579 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007f5cf7b71b89 in  () at /usr/lib/libQt5Qml.so.5
#9  0x00007f5cf610e97c in  () at /usr/lib/libQt5Core.so.5
#10 0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f5cef8fe700 (LWP 10641)):
#0  0x00007f5cf41843b9 in g_mutex_lock () at /usr/lib/libglib-2.0.so.0
#1  0x00007f5cf41ccf72 in g_main_context_query () at /usr/lib/libglib-2.0.so.0
#2  0x00007f5cf41d64bc in  () at /usr/lib/libglib-2.0.so.0
#3  0x00007f5cf41d662e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#4  0x00007f5cf6320574 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f5cf62c953c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007f5cf610d579 in QThread::exec() () at /usr/lib/libQt5Core.so.5
#7  0x00007f5cf6c0fba6 in  () at /usr/lib/libQt5DBus.so.5
#8  0x00007f5cf610e97c in  () at /usr/lib/libQt5Core.so.5
#9  0x00007f5cf500fa9d in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007f5cf5df8b23 in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f5cf0bc3880 (LWP 10591)):
[KCrash Handler]
#6  0x00007f5cce4a90de in QtWaylandClient::QWaylandXdgSurfaceV6::setPopup(QtWaylandClient::QWaylandWindow*, QtWaylandClient::QWaylandInputDevice*, int, bool) () at /usr/lib/qt/plugins/wayland-shell-integration/libxdg-shell-v6.so
#7  0x00007f5cce4a962d in QtWaylandClient::QWaylandXdgShellV6::getXdgSurface(QtWaylandClient::QWaylandWindow*) () at /usr/lib/qt/plugins/wayland-shell-integration/libxdg-shell-v6.so
#8  0x00007f5cf080feed in QtWaylandClient::QWaylandWindow::initWindow() () at /usr/lib/libQt5WaylandClient.so.5
#9  0x00007f5cf081044c in QtWaylandClient::QWaylandWindow::setVisible(bool) () at /usr/lib/libQt5WaylandClient.so.5
#10 0x00007f5ced270ad5 in  () at /usr/lib/qt/plugins/wayland-graphics-integration-client/libqt-plugin-wayland-egl.so
#11 0x00007f5cf671229c in QWindowPrivate::setVisible(bool) () at /usr/lib/libQt5Gui.so.5
#12 0x00007f5cf6ea4ce9 in QWidgetPrivate::show_sys() () at /usr/lib/libQt5Widgets.so.5
#13 0x00007f5cf6eae271 in QWidgetPrivate::show_helper() () at /usr/lib/libQt5Widgets.so.5
#14 0x00007f5cf6eb1555 in QWidget::setVisible(bool) () at /usr/lib/libQt5Widgets.so.5
#15 0x00007f5cf6fea722 in QMenu::popup(QPoint const&, QAction*) () at /usr/lib/libQt5Widgets.so.5
#16 0x00007f5ced4575e4 in  () at /usr/lib/qt/plugins/plasma/scriptengines/plasma_appletscript_declarative.so
#17 0x00007f5cf7f024f8 in QQuickItem::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#18 0x00007f5ced44d8f7 in  () at /usr/lib/qt/plugins/plasma/scriptengines/plasma_appletscript_declarative.so
#19 0x00007f5cf6e70e34 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#20 0x00007f5cf6e78671 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#21 0x00007f5cf62ca8a9 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#22 0x00007f5cf7f1be78 in QQuickWindowPrivate::deliverMatchingPointsToItem(QQuickItem*, QQuickPointerEvent*, bool) () at /usr/lib/libQt5Quick.so.5
#23 0x00007f5cf7f1cd43 in QQuickWindowPrivate::deliverPressOrReleaseEvent(QQuickPointerEvent*, bool) () at /usr/lib/libQt5Quick.so.5
#24 0x00007f5cf7f1d0ce in QQuickWindowPrivate::deliverMouseEvent(QQuickPointerMouseEvent*) () at /usr/lib/libQt5Quick.so.5
#25 0x00007f5cf7f1e20c in QQuickWindowPrivate::deliverPointerEvent(QQuickPointerEvent*) () at /usr/lib/libQt5Quick.so.5
#26 0x00007f5cf7f1ef79 in QQuickWindowPrivate::handleMouseEvent(QMouseEvent*) () at /usr/lib/libQt5Quick.so.5
#27 0x00007f5cf67126c5 in QWindow::event(QEvent*) () at /usr/lib/libQt5Gui.so.5
#28 0x00007f5cf7f2030c in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#29 0x000055b55d98547c in  ()
#30 0x00007f5cf6e70e34 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#31 0x00007f5cf6e78671 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#32 0x00007f5cf62ca8a9 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#33 0x00007f5cf67069be in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at /usr/lib/libQt5Gui.so.5
#34 0x00007f5cf6707e26 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib/libQt5Gui.so.5
#35 0x00007f5cf66e175c in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Gui.so.5
#36 0x00007f5cf083ee71 in  () at /usr/lib/libQt5WaylandClient.so.5
#37 0x00007f5cf41d4a2f in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#38 0x00007f5cf41d65e9 in  () at /usr/lib/libglib-2.0.so.0
#39 0x00007f5cf41d662e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#40 0x00007f5cf6320559 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#41 0x00007f5cf62c953c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#42 0x00007f5cf62d1846 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#43 0x000055b55d974d2e in  ()
#44 0x00007f5cf5d21223 in __libc_start_main () at /usr/lib/libc.so.6
#45 0x000055b55d9751de in _start ()
[Inferior 1 (process 10591) detached]

Reported using DrKonqi

Comment 1 Vishnu 2019-01-12 18:46:07 UTC

The 'Task Switcher' I had selected was 'Breeze'. I changed that and it solved the problem. I can now switch even when there is a fullscreen application.

Comment 2 David Edmundson 2021-03-01 22:32:14 UTC

Crash is in Qt for a now old Qt.

Please reopen if it happens in Qt 5.15 or newer