[kde] [Bug 368200] New: Crash somewhere in taskbar on desktop switching

Friedrich W. H. Kossebau via KDE Bugzilla bugzilla_noreply at kde.org
Sat Sep 3 17:08:47 BST 2016 

https://bugs.kde.org/show_bug.cgi?id=368200

            Bug ID: 368200
           Summary: Crash somewhere in taskbar on desktop switching
           Product: kde
           Version: unspecified
          Platform: unspecified
                OS: Linux
            Status: UNCONFIRMED
          Keywords: drkonqi
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: kossebau at kde.org

Application: plasmashell (5.7.4)

Qt Version: 5.6.1
Frameworks Version: 5.25.0
Operating System: Linux 4.7.2-2.g8a962cf-default x86_64
Distribution: "openSUSE Tumbleweed"

-- Information about the crash:
In all recent versions of Plasma this crash happens now and then when I switch
the desktops (which I do with Alt-Tab).

I have the widget "Fensterleiste" (taskpanel?) in my bottom panel, configured
to
* show only tasks from current desktop
* show only tasks from current acticity
* grouping by program name
* sorting alphabetically

Both virtual desktops have windows on them.

I could not see a pattern so far. It seems to happen if windows are
added/removed, but also when I could not remember to have added/removed windows
(or that being done automatically).

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f8d1d3018c0 (LWP 25511))]

Thread 10 (Thread 0x7f8c3f5ee700 (LWP 13381)):
#0  0x00007f8d1693ba1d in poll () at /lib64/libc.so.6
#1  0x00007f8d12fbd036 in  () at /usr/lib64/libglib-2.0.so.0
#2  0x00007f8d12fbd14c in g_main_context_iteration () at
/usr/lib64/libglib-2.0.so.0
#3  0x00007f8d17267aeb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib64/libQt5Core.so.5
#4  0x00007f8d1720f76a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib64/libQt5Core.so.5
#5  0x00007f8d170353b3 in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007f8d1a3e11e5 in  () at /usr/lib64/libQt5Qml.so.5
#7  0x00007f8d1703a2d8 in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007f8d1613e474 in start_thread () at /lib64/libpthread.so.0
#9  0x00007f8d169443ed in clone () at /lib64/libc.so.6

Thread 9 (Thread 0x7f8c4fb62700 (LWP 26364)):
#0  0x00007f8d1693ba1d in poll () at /lib64/libc.so.6
#1  0x00007f8d12fbd036 in  () at /usr/lib64/libglib-2.0.so.0
#2  0x00007f8d12fbd14c in g_main_context_iteration () at
/usr/lib64/libglib-2.0.so.0
#3  0x00007f8d17267aeb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib64/libQt5Core.so.5
#4  0x00007f8d1720f76a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib64/libQt5Core.so.5
#5  0x00007f8d170353b3 in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007f8c522a1e17 in KCupsConnection::run() () at
/usr/lib64/libkcupslib.so
#7  0x00007f8d1703a2d8 in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007f8d1613e474 in start_thread () at /lib64/libpthread.so.0
#9  0x00007f8d169443ed in clone () at /lib64/libc.so.6

Thread 8 (Thread 0x7f8c5e6f9700 (LWP 25885)):
#0  0x00007f8d1693ba1d in poll () at /lib64/libc.so.6
#1  0x00007f8d12fbd036 in  () at /usr/lib64/libglib-2.0.so.0
#2  0x00007f8d12fbd14c in g_main_context_iteration () at
/usr/lib64/libglib-2.0.so.0
#3  0x00007f8d17267aeb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib64/libQt5Core.so.5
#4  0x00007f8d1720f76a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib64/libQt5Core.so.5
#5  0x00007f8d170353b3 in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007f8d1af70606 in  () at /usr/lib64/libQt5Quick.so.5
#7  0x00007f8d1703a2d8 in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007f8d1613e474 in start_thread () at /lib64/libpthread.so.0
#9  0x00007f8d169443ed in clone () at /lib64/libc.so.6

Thread 7 (Thread 0x7f8cf1c7c700 (LWP 25615)):
#0  0x00007f8d1614409f in pthread_cond_wait@@GLIBC_2.3.2 () at
/lib64/libpthread.so.0
#1  0x00007f8d1c9e6fc4 in QTWTF::TCMalloc_PageHeap::scavengerThread()
(this=0x7f8d1ccd0ec0 <QTWTF::pageheap_memory>) at
../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007f8d1c9e7009 in QTWTF::TCMalloc_PageHeap::runScavengerThread(void*)
(context=<optimized out>) at
../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007f8d1613e474 in start_thread () at /lib64/libpthread.so.0
#4  0x00007f8d169443ed in clone () at /lib64/libc.so.6

Thread 6 (Thread 0x7f8cf314b700 (LWP 25572)):
#0  0x00007f8d1693ba1d in poll () at /lib64/libc.so.6
#1  0x00007f8d12fbd036 in  () at /usr/lib64/libglib-2.0.so.0
#2  0x00007f8d12fbd14c in g_main_context_iteration () at
/usr/lib64/libglib-2.0.so.0
#3  0x00007f8d17267aeb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib64/libQt5Core.so.5
#4  0x00007f8d1720f76a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib64/libQt5Core.so.5
#5  0x00007f8d170353b3 in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007f8d1703a2d8 in  () at /usr/lib64/libQt5Core.so.5
#7  0x00007f8d1613e474 in start_thread () at /lib64/libpthread.so.0
#8  0x00007f8d169443ed in clone () at /lib64/libc.so.6

Thread 5 (Thread 0x7f8cfd5c5700 (LWP 25549)):
#0  0x00007f8d13001034 in g_mutex_unlock () at /usr/lib64/libglib-2.0.so.0
#1  0x00007f8d12fbbfde in g_main_context_acquire () at
/usr/lib64/libglib-2.0.so.0
#2  0x00007f8d12fbcee5 in  () at /usr/lib64/libglib-2.0.so.0
#3  0x00007f8d12fbd14c in g_main_context_iteration () at
/usr/lib64/libglib-2.0.so.0
#4  0x00007f8d17267aeb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib64/libQt5Core.so.5
#5  0x00007f8d1720f76a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib64/libQt5Core.so.5
#6  0x00007f8d170353b3 in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#7  0x00007f8d1a3e11e5 in  () at /usr/lib64/libQt5Qml.so.5
#8  0x00007f8d1703a2d8 in  () at /usr/lib64/libQt5Core.so.5
#9  0x00007f8d1613e474 in start_thread () at /lib64/libpthread.so.0
#10 0x00007f8d169443ed in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f8cfefc4700 (LWP 25527)):
#0  0x00007f8d13001034 in g_mutex_unlock () at /usr/lib64/libglib-2.0.so.0
#1  0x00007f8d12fbc57c in g_main_context_prepare () at
/usr/lib64/libglib-2.0.so.0
#2  0x00007f8d12fbcf5b in  () at /usr/lib64/libglib-2.0.so.0
#3  0x00007f8d12fbd14c in g_main_context_iteration () at
/usr/lib64/libglib-2.0.so.0
#4  0x00007f8d17267aeb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib64/libQt5Core.so.5
#5  0x00007f8d1720f76a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib64/libQt5Core.so.5
#6  0x00007f8d170353b3 in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#7  0x00007f8d1a3e11e5 in  () at /usr/lib64/libQt5Qml.so.5
#8  0x00007f8d1703a2d8 in  () at /usr/lib64/libQt5Core.so.5
#9  0x00007f8d1613e474 in start_thread () at /lib64/libpthread.so.0
#10 0x00007f8d169443ed in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f8d04ada700 (LWP 25516)):
#0  0x00007f8d12fba0bd in  () at /usr/lib64/libglib-2.0.so.0
#1  0x00007f8d12fbc984 in g_main_context_check () at
/usr/lib64/libglib-2.0.so.0
#2  0x00007f8d12fbcfd4 in  () at /usr/lib64/libglib-2.0.so.0
#3  0x00007f8d12fbd14c in g_main_context_iteration () at
/usr/lib64/libglib-2.0.so.0
#4  0x00007f8d17267aeb in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib64/libQt5Core.so.5
#5  0x00007f8d1720f76a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib64/libQt5Core.so.5
#6  0x00007f8d170353b3 in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#7  0x00007f8d17e0b9b5 in  () at /usr/lib64/libQt5DBus.so.5
#8  0x00007f8d1703a2d8 in  () at /usr/lib64/libQt5Core.so.5
#9  0x00007f8d1613e474 in start_thread () at /lib64/libpthread.so.0
#10 0x00007f8d169443ed in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f8d06751700 (LWP 25515)):
#0  0x00007f8d1693ba1d in poll () at /lib64/libc.so.6
#1  0x00007f8d1b92e410 in  () at /usr/lib64/libxcb.so.1
#2  0x00007f8d1b9301a9 in xcb_wait_for_event () at /usr/lib64/libxcb.so.1
#3  0x00007f8d08ab87b9 in  () at /usr/lib64/libQt5XcbQpa.so.5
#4  0x00007f8d1703a2d8 in  () at /usr/lib64/libQt5Core.so.5
#5  0x00007f8d1613e474 in start_thread () at /lib64/libpthread.so.0
#6  0x00007f8d169443ed in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f8d1d3018c0 (LWP 25511)):
[KCrash Handler]
#6  0x00007f8d171d78b0 in  () at /usr/lib64/libQt5Core.so.5
#7  0x00007f8d171d7b41 in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007f8d171dff39 in  () at /usr/lib64/libQt5Core.so.5
#9  0x00007f8d1723f1a9 in QMetaObject::activate(QObject*, int, int, void**) ()
at /usr/lib64/libQt5Core.so.5
#10 0x00007f8d172b8f84 in QAbstractItemModel::rowsRemoved(QModelIndex const&,
int, int, QAbstractItemModel::QPrivateSignal) () at /usr/lib64/libQt5Core.so.5
#11 0x00007f8d171b851b in QAbstractItemModel::endRemoveRows() () at
/usr/lib64/libQt5Core.so.5
#12 0x00007f8c5c526498 in  () at /usr/lib64/libtaskmanager.so.6
#13 0x00007f8c5c529469 in  () at /usr/lib64/libtaskmanager.so.6
#14 0x00007f8d1723f1a9 in QMetaObject::activate(QObject*, int, int, void**) ()
at /usr/lib64/libQt5Core.so.5
#15 0x00007f8d172b8f14 in QAbstractItemModel::rowsAboutToBeRemoved(QModelIndex
const&, int, int, QAbstractItemModel::QPrivateSignal) () at
/usr/lib64/libQt5Core.so.5
#16 0x00007f8d171b7dc3 in QAbstractItemModel::beginRemoveRows(QModelIndex
const&, int, int) () at /usr/lib64/libQt5Core.so.5
#17 0x00007f8d171dd695 in  () at /usr/lib64/libQt5Core.so.5
#18 0x00007f8d171deb24 in  () at /usr/lib64/libQt5Core.so.5
#19 0x00007f8d171df4b1 in QSortFilterProxyModel::invalidateFilter() () at
/usr/lib64/libQt5Core.so.5
#20 0x00007f8c5c522265 in
TaskManager::TaskFilterProxyModel::setVirtualDesktop(unsigned int) () at
/usr/lib64/libtaskmanager.so.6
#21 0x00007f8c5c548e39 in  () at /usr/lib64/libtaskmanager.so.6
#22 0x00007f8c5c549cab in
TaskManager::TasksModel::qt_metacall(QMetaObject::Call, int, void**) () at
/usr/lib64/libtaskmanager.so.6
#23 0x00007f8d1a349440 in QQmlVMEMetaObject::metaCall(QObject*,
QMetaObject::Call, int, void**) () at /usr/lib64/libQt5Qml.so.5
#24 0x00007f8d1a3cc255 in QQmlBinding::write(QQmlPropertyData const&,
QV4::Value const&, bool, QFlags<QQmlPropertyPrivate::WriteFlag>) () at
/usr/lib64/libQt5Qml.so.5
#25 0x00007f8d1a3cd3e7 in
QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) () at
/usr/lib64/libQt5Qml.so.5
#26 0x00007f8d1a3cd8be in QQmlBinding::refresh() () at
/usr/lib64/libQt5Qml.so.5
#27 0x00007f8d1a3a3454 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*,
void**) () at /usr/lib64/libQt5Qml.so.5
#28 0x00007f8d1a34dde4 in QQmlData::signalEmitted(QAbstractDeclarativeData*,
QObject*, int, void**) () at /usr/lib64/libQt5Qml.so.5
#29 0x00007f8d1723e910 in QMetaObject::activate(QObject*, int, int, void**) ()
at /usr/lib64/libQt5Core.so.5
#30 0x00007f8d1723f24c in QMetaObject::activate(QObject*, int, int, void**) ()
at /usr/lib64/libQt5Core.so.5
#31 0x00007f8d19efd58e in KWindowSystem::currentDesktopChanged(int) () at
/usr/lib64/libKF5WindowSystem.so.5
#32 0x00007f8cff3e3ef7 in  () at
/usr/lib64/qt5/plugins/kf5/org.kde.kwindowsystem.platforms/KF5WindowSystemX11Plugin.so
#33 0x00007f8d1720e8af in
QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) ()
at /usr/lib64/libQt5Core.so.5
#34 0x00007f8d08aba195 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*)
() at /usr/lib64/libQt5XcbQpa.so.5
#35 0x00007f8d08abb12b in QXcbConnection::processXcbEvents() () at
/usr/lib64/libQt5XcbQpa.so.5
#36 0x00007f8d1723fcf9 in QObject::event(QEvent*) () at
/usr/lib64/libQt5Core.so.5
#37 0x00007f8d181e3aec in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() at /usr/lib64/libQt5Widgets.so.5
#38 0x00007f8d181e8f8f in QApplication::notify(QObject*, QEvent*) () at
/usr/lib64/libQt5Widgets.so.5
#39 0x00007f8d17211a20 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() at /usr/lib64/libQt5Core.so.5
#40 0x00007f8d1721399c in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*) () at /usr/lib64/libQt5Core.so.5
#41 0x00007f8d172676c3 in  () at /usr/lib64/libQt5Core.so.5
#42 0x00007f8d12fbce37 in g_main_context_dispatch () at
/usr/lib64/libglib-2.0.so.0
#43 0x00007f8d12fbd0a0 in  () at /usr/lib64/libglib-2.0.so.0
#44 0x00007f8d12fbd14c in g_main_context_iteration () at
/usr/lib64/libglib-2.0.so.0
#45 0x00007f8d17267acf in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib64/libQt5Core.so.5
#46 0x00007f8d1720f76a in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib64/libQt5Core.so.5
#47 0x00007f8d17217f6c in QCoreApplication::exec() () at
/usr/lib64/libQt5Core.so.5
#48 0x000000000041cd8f in  ()
#49 0x00007f8d1687c741 in __libc_start_main () at /lib64/libc.so.6
#50 0x000000000041d109 in _start ()

Reported using DrKonqi

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