Bug 353513

Summary:	Crash on drag'n'drop from taskbar
Product:	[Plasma] plasmashell	Reporter:	Alexander Potashev <aspotashev>
Component:	general	Assignee:	David Edmundson <kde>
Status:	RESOLVED FIXED
Severity:	crash	CC:	bshah, notmart, plasma-bugs-null
Priority:	NOR	Keywords:	drkonqi
Version First Reported In:	5.4.1
Target Milestone:	1.0
Platform:	Gentoo Packages
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Alexander Potashev 2015-10-04 00:59:47 UTC

Application: plasmashell (5.4.1)

Qt Version: 5.5.0
Operating System: Linux 3.10.17-gentoo x86_64
Distribution: "NAME=Gentoo"

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

When hard disk contention was high, I clicked no an item in taskbar and then moved the mouse pointer above the Plasma panel over a Konsole window. When programs are fighting for resources, everything is slow and thus clicking on taskbar and moving the mouse pointer probably works an a drag'n'drop.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Aborted
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f09097087c0 (LWP 9651))]

Thread 6 (Thread 0x7f08ee73c700 (LWP 9666)):
#0  0x00007f0903de07ed in poll () from /lib64/libc.so.6
#1  0x00007f08ffeb8b74 in g_main_context_iterate.isra () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f08ffeb8c8c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f090464353b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#4  0x00007f09045eea5b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#5  0x00007f090443d43c in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#6  0x00007f0906c5c5d8 in QQmlThreadPrivate::run() () from /usr/lib64/libQt5Qml.so.5
#7  0x00007f0904442876 in QThreadPrivate::start(void*) () from /usr/lib64/libQt5Core.so.5
#8  0x00007f09035ea204 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f0903de93dd in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7f08e6adb700 (LWP 9672)):
#0  0x00007f08ffefa894 in g_mutex_unlock () from /usr/lib64/libglib-2.0.so.0
#1  0x00007f08ffeb8b69 in g_main_context_iterate.isra () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f08ffeb8c8c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f090464353b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#4  0x00007f09045eea5b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#5  0x00007f090443d43c in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#6  0x00007f0906c5c5d8 in QQmlThreadPrivate::run() () from /usr/lib64/libQt5Qml.so.5
#7  0x00007f0904442876 in QThreadPrivate::start(void*) () from /usr/lib64/libQt5Core.so.5
#8  0x00007f09035ea204 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f0903de93dd in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7f08e5001700 (LWP 9677)):
#0  0x00007f08ffefa894 in g_mutex_unlock () from /usr/lib64/libglib-2.0.so.0
#1  0x00007f08ffeb8469 in g_main_context_query () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f08ffeb8adf in g_main_context_iterate.isra () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f08ffeb8c8c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#4  0x00007f090464353b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#5  0x00007f09045eea5b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#6  0x00007f090443d43c in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#7  0x00007f0906c5c5d8 in QQmlThreadPrivate::run() () from /usr/lib64/libQt5Qml.so.5
#8  0x00007f0904442876 in QThreadPrivate::start(void*) () from /usr/lib64/libQt5Core.so.5
#9  0x00007f09035ea204 in start_thread () from /lib64/libpthread.so.0
#10 0x00007f0903de93dd in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7f08dd307700 (LWP 9681)):
#0  0x00007f0903de07ed in poll () from /lib64/libc.so.6
#1  0x00007f08ffeb8b74 in g_main_context_iterate.isra () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f08ffeb8c8c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f090464353b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#4  0x00007f09045eea5b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#5  0x00007f090443d43c in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#6  0x00007f09076163f2 in QQuickPixmapReader::run() () from /usr/lib64/libQt5Quick.so.5
#7  0x00007f0904442876 in QThreadPrivate::start(void*) () from /usr/lib64/libQt5Core.so.5
#8  0x00007f09035ea204 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f0903de93dd in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f084a2e8700 (LWP 9686)):
#0  0x00007f08ffefa894 in g_mutex_unlock () from /usr/lib64/libglib-2.0.so.0
#1  0x00007f08ffeb7c30 in g_main_context_acquire () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f08ffeb8a35 in g_main_context_iterate.isra () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f08ffeb8c8c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#4  0x00007f090464353b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#5  0x00007f09045eea5b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#6  0x00007f090443d43c in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#7  0x00007f084b189587 in KCupsConnection::run() () from /usr/lib64/libkcupslib.so
#8  0x00007f0904442876 in QThreadPrivate::start(void*) () from /usr/lib64/libQt5Core.so.5
#9  0x00007f09035ea204 in start_thread () from /lib64/libpthread.so.0
#10 0x00007f0903de93dd in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f09097087c0 (LWP 9651)):
[KCrash Handler]
#6  0x00007f0903d36e67 in raise () from /lib64/libc.so.6
#7  0x00007f0903d381ca in abort () from /lib64/libc.so.6
#8  0x00007f09044318de in QMessageLogger::fatal(char const*, ...) const () from /usr/lib64/libQt5Core.so.5
#9  0x00007f090442b134 in qt_assert(char const*, char const*, int) () from /usr/lib64/libQt5Core.so.5
#10 0x00007f09076cc4b8 in QQuickWindowPrivate::deliverDragEvent(QQuickDragGrabber*, QEvent*) () from /usr/lib64/libQt5Quick.so.5
#11 0x00007f09076cc613 in QQuickWindow::event(QEvent*) () from /usr/lib64/libQt5Quick.so.5
#12 0x00000000004434cb in PanelView::event(QEvent*) ()
#13 0x00007f09050b08bc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#14 0x00007f09050b5730 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#15 0x00007f09045f06dd in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#16 0x00007f09045f366a in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib64/libQt5Core.so.5
#17 0x00007f0904643d63 in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () from /usr/lib64/libQt5Core.so.5
#18 0x00007f08ffeb8994 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#19 0x00007f08ffeb8be8 in g_main_context_iterate.isra () from /usr/lib64/libglib-2.0.so.0
#20 0x00007f08ffeb8c8c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#21 0x00007f090464351c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#22 0x00007f09045eea5b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#23 0x00007f090493a632 in QBasicDrag::drag(QDrag*) () from /usr/lib64/libQt5Gui.so.5
#24 0x00007f0904950589 in QDragManager::drag(QDrag*) () from /usr/lib64/libQt5Gui.so.5
#25 0x00007f090494fb6c in QDrag::exec(QFlags<Qt::DropAction>, Qt::DropAction) () from /usr/lib64/libQt5Gui.so.5
#26 0x00007f0852f2d33f in DragHelper::startDragInternal(QQuickItem*, QString const&, QVariant const&, QUrl const&, QIcon const&) const () from /usr/lib64/qt5/qml/org/kde/plasma/private/taskmanager/libtaskmanagerplugin.so
#27 0x00007f090461d86e in QObject::event(QEvent*) () from /usr/lib64/libQt5Core.so.5
#28 0x00007f09050b08bc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#29 0x00007f09050b5730 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#30 0x00007f09045f06dd in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#31 0x00007f09045f366a in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib64/libQt5Core.so.5
#32 0x00007f0904643d63 in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () from /usr/lib64/libQt5Core.so.5
#33 0x00007f08ffeb8994 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#34 0x00007f08ffeb8be8 in g_main_context_iterate.isra () from /usr/lib64/libglib-2.0.so.0
#35 0x00007f08ffeb8c8c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#36 0x00007f090464351c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#37 0x00007f09045eea5b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#38 0x00007f09045f6466 in QCoreApplication::exec() () from /usr/lib64/libQt5Core.so.5
#39 0x00000000004314ab in main ()

Reported using DrKonqi

Comment 1 Marco Martin 2015-10-14 15:15:15 UTC

since is an assert, can you provide the terminal output as well when it crashes if you can still reproduce?

Comment 2 David Edmundson 2015-12-21 16:23:29 UTC

This PanelView::event got changed significantly for 5.5.1. Given I don't have any duplicates since then can you repoen if you still see the crash.