Bug 382411

Application: plasmashell (5.10.3)

Qt Version: 5.9.0
Frameworks Version: 5.35.0
Operating System: Linux 4.12.0-1-MANJARO x86_64
Distribution: "Manjaro Linux"

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

Usual desktop activities - browsing the web in Firefox, reading some PDFs in Okular, modelling in Blender (these applications are normally always open) - the activity in particuar doesn't seem to affect when it happens, seems to be at random

- Unusual behavior I noticed:

Plasmashell crashes at random, taking with it the taskbar, application titlebars, redshift screen state etc, but krunner still works, alt-tab still works. It used to be less of an annoyance as it would normally just automatically relaunch after less than a second, though lately after the last few releases it seems to be less able to do this. Now I am often left without it and sometimes I am able to recover it by runnning "kquitapp5 plasmashell" followed by "kstart plasmashell", but on other occasions the shell will start but the taskbar is full of unidentified X apps that I am unable to switch to and the only way to recover seems to be restarting SDDM to get a new X session.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Aborted
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fa86f7aed80 (LWP 8838))]

Thread 10 (Thread 0x7fa79db0f700 (LWP 8862)):
#0  0x00007fa8639d913e in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#1  0x00007fa8639d9b2b in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fa8639d9d0c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007fa869746e9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007fa8696ed21a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007fa86950f40a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007fa7a44cc427 in KCupsConnection::run() () at /usr/lib/libkcupslib.so
#7  0x00007fa869513cbd in  () at /usr/lib/libQt5Core.so.5
#8  0x00007fa8686dc297 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007fa868e281ef in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7fa7a7e04700 (LWP 8856)):
#0  0x00007fa868e19fbd in read () at /usr/lib/libc.so.6
#1  0x00007fa863a1d6f0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fa8639d96db in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007fa8639d9ba0 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007fa8639d9d0c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007fa869746e9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007fa8696ed21a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007fa86950f40a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007fa869513cbd in  () at /usr/lib/libQt5Core.so.5
#9  0x00007fa8686dc297 in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007fa868e281ef in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7fa7a8605700 (LWP 8855)):
#0  0x00007fa868e19fbd in read () at /usr/lib/libc.so.6
#1  0x00007fa863a1d6f0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fa8639d96db in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007fa8639d9ba0 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007fa8639d9d0c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007fa869746e9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007fa8696ed21a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007fa86950f40a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007fa7a8c213c5 in  () at /usr/lib/qt/qml/QtQuick/XmlListModel/libqmlxmllistmodelplugin.so
#9  0x00007fa869513cbd in  () at /usr/lib/libQt5Core.so.5
#10 0x00007fa8686dc297 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007fa868e281ef in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7fa7b56f7700 (LWP 8847)):
#0  0x00007fa868e19fbd in read () at /usr/lib/libc.so.6
#1  0x00007fa863a1d6f0 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fa8639d96db in g_main_context_check () at /usr/lib/libglib-2.0.so.0
#3  0x00007fa8639d9ba0 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007fa8639d9d0c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#5  0x00007fa869746e9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#6  0x00007fa8696ed21a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#7  0x00007fa86950f40a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#8  0x00007fa86d236836 in  () at /usr/lib/libQt5Quick.so.5
#9  0x00007fa869513cbd in  () at /usr/lib/libQt5Core.so.5
#10 0x00007fa8686dc297 in start_thread () at /usr/lib/libpthread.so.0
#11 0x00007fa868e281ef in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7fa84952f700 (LWP 8846)):
#0  0x00007fa8686e239d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fa86ef51ac4 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007fa86ef51b09 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007fa8686dc297 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007fa868e281ef in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7fa84b78f700 (LWP 8842)):
#0  0x00007fa863a1ea44 in g_mutex_unlock () at /usr/lib/libglib-2.0.so.0
#1  0x00007fa8639d9d16 in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#2  0x00007fa869746e9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007fa8696ed21a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007fa86950f40a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007fa86c67e645 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007fa869513cbd in  () at /usr/lib/libQt5Core.so.5
#7  0x00007fa8686dc297 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007fa868e281ef in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7fa851c1d700 (LWP 8841)):
#0  0x00007ffe663fdbab in clock_gettime ()
#1  0x00007fa868e35746 in clock_gettime () at /usr/lib/libc.so.6
#2  0x00007fa869746041 in  () at /usr/lib/libQt5Core.so.5
#3  0x00007fa869744879 in QTimerInfoList::updateCurrentTime() () at /usr/lib/libQt5Core.so.5
#4  0x00007fa869744e55 in QTimerInfoList::timerWait(timespec&) () at /usr/lib/libQt5Core.so.5
#5  0x00007fa86974647e in  () at /usr/lib/libQt5Core.so.5
#6  0x00007fa8639d9138 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#7  0x00007fa8639d9b2b in  () at /usr/lib/libglib-2.0.so.0
#8  0x00007fa8639d9d0c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#9  0x00007fa869746e9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#10 0x00007fa8696ed21a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#11 0x00007fa86950f40a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#12 0x00007fa86c67e645 in  () at /usr/lib/libQt5Qml.so.5
#13 0x00007fa869513cbd in  () at /usr/lib/libQt5Core.so.5
#14 0x00007fa8686dc297 in start_thread () at /usr/lib/libpthread.so.0
#15 0x00007fa868e281ef in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7fa853667700 (LWP 8840)):
#0  0x00007fa868e1e24d in poll () at /usr/lib/libc.so.6
#1  0x00007fa8639d9bf9 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fa8639d9d0c in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007fa869746e9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007fa8696ed21a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007fa86950f40a in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007fa869b6dd45 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007fa869513cbd in  () at /usr/lib/libQt5Core.so.5
#8  0x00007fa8686dc297 in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007fa868e281ef in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7fa859709700 (LWP 8839)):
#0  0x00007fa868e1e24d in poll () at /usr/lib/libc.so.6
#1  0x00007fa86de5f8e0 in  () at /usr/lib/libxcb.so.1
#2  0x00007fa86de61679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1
#3  0x00007fa85bc83d49 in  () at /usr/lib/libQt5XcbQpa.so.5
#4  0x00007fa869513cbd in  () at /usr/lib/libQt5Core.so.5
#5  0x00007fa8686dc297 in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fa868e281ef in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7fa86f7aed80 (LWP 8838)):
[KCrash Handler]
#5  0x00007fa868d6e670 in raise () at /usr/lib/libc.so.6
#6  0x00007fa868d6fd00 in abort () at /usr/lib/libc.so.6
#7  0x00007fa868dad551 in __libc_message () at /usr/lib/libc.so.6
#8  0x00007fa868db3bfb in malloc_printerr () at /usr/lib/libc.so.6
#9  0x00007fa868db4fd1 in _int_free () at /usr/lib/libc.so.6
#10 0x00007fa8697375d2 in  () at /usr/lib/libQt5Core.so.5
#11 0x00007fa8697349c9 in QVariant::cmp(QVariant const&) const () at /usr/lib/libQt5Core.so.5
#12 0x00007fa86c5d1bf9 in QQmlOpenMetaObject::setValue(QByteArray const&, QVariant const&) () at /usr/lib/libQt5Qml.so.5
#13 0x00007fa86c6b0f8e in  () at /usr/lib/libQt5Qml.so.5
#14 0x00007fa86c6b3286 in  () at /usr/lib/libQt5Qml.so.5
#15 0x00007fa86c6b3352 in  () at /usr/lib/libQt5Qml.so.5
#16 0x00007fa86971a6bd in QObjectData::dynamicMetaObject() const () at /usr/lib/libQt5Core.so.5
#17 0x00007fa86c5d9c2e in QQmlData::disconnectNotifiers() () at /usr/lib/libQt5Qml.so.5
#18 0x00007fa86c5da03a in QQmlData::destroyed(QObject*) () at /usr/lib/libQt5Qml.so.5
#19 0x00007fa869724477 in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#20 0x00007fa869724db9 in QObject::~QObject() () at /usr/lib/libQt5Core.so.5
#21 0x00007fa86c6b3527 in  () at /usr/lib/libQt5Qml.so.5
#22 0x00007fa86c6b36a1 in  () at /usr/lib/libQt5Qml.so.5
#23 0x00007fa86c6b3a2e in QQmlListModel::clear() () at /usr/lib/libQt5Qml.so.5
#24 0x00007fa86c6b92dd in  () at /usr/lib/libQt5Qml.so.5
#25 0x00007fa86c6b98b5 in QQmlListModel::qt_metacall(QMetaObject::Call, int, void**) () at /usr/lib/libQt5Qml.so.5
#26 0x00007fa86c632a39 in  () at /usr/lib/libQt5Qml.so.5
#27 0x00007fa86c5b104b in  () at /usr/lib/libQt5Qml.so.5
#28 0x00007fa86c5b28b2 in  () at /usr/lib/libQt5Qml.so.5
#29 0x00007fa86c5b35d9 in QV4::QObjectMethod::callInternal(QV4::CallData*, QV4::Scope&) const () at /usr/lib/libQt5Qml.so.5
#30 0x00007fa86c5cbb0e in QV4::Runtime::method_callProperty(QV4::ExecutionEngine*, int, QV4::CallData*) () at /usr/lib/libQt5Qml.so.5
#31 0x00007fa7a8e30aa0 in  ()
#32 0x00007fa84a390470 in  ()
#33 0x8329571025d89c00 in  ()
#34 0x0000000004ec1320 in  ()
#35 0x00007fa84a390468 in  ()
#36 0x00007fa84a390438 in  ()
#37 0x00007fa84a390448 in  ()
#38 0x00007fa86c6fb9b0 in  () at /usr/lib/libQt5Qml.so.5
#39 0x00007ffe663ce0e0 in  ()
#40 0x0000000004ed56a0 in  ()
#41 0x00000000020a82b0 in  ()
#42 0x00000000020a82b0 in  ()
#43 0x00007fa86c53c077 in QV4::ExecutionContext::simpleCall(QV4::Scope&, QV4::CallData*, QV4::Function*) () at /usr/lib/libQt5Qml.so.5
#44 0x00007fa86c561655 in  () at /usr/lib/libQt5Qml.so.5
#45 0x00007fa86c5c810f in QV4::Runtime::method_callActivationProperty(QV4::ExecutionEngine*, int, QV4::CallData*) () at /usr/lib/libQt5Qml.so.5
#46 0x00007fa7a8e2ff78 in  ()
#47 0x0000000000000000 in  ()

Reported using DrKonqi