Bug 350281

Summary: Plasma crash in QXcbScreen::mapToNative from PlasmaQuick::Dialog::setVisible
Product: [Plasma] plasmashell Reporter: Alex Fiestas <afiestas>
Component: generalAssignee: David Edmundson <kde>
Status: RESOLVED UPSTREAM    
Severity: crash CC: arichardson.kde, bhush94, christoph, jeanbaptiste.louvet, kde.track.pasilli, kdebug, le.trmr, linds.r, mmbossoni, plasma-bugs
Priority: NOR Keywords: drkonqi
Version: 5.3.90   
Target Milestone: 1.0   
Platform: Compiled Sources   
OS: Linux   
See Also: https://bugreports.qt.io/browse/QTBUG-42985
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: New crash information added by DrKonqi

Description Alex Fiestas 2015-07-16 09:16:34 UTC 
Application: plasmashell (5.3.90)
 (Compiled from sources)
Qt Version: 5.5.1
Operating System: Linux 4.0.6-1-ARCH x86_64
Distribution: "Arch Linux"

-- Information about the crash:
Some times when I open the lid after suspension plasma will crash with this bt.

Happened twice.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fde4c6c6840 (LWP 1478))]

Thread 8 (Thread 0x7fde49da5700 (LWP 1495)):
#0  0x00007fde59001e8d in poll () from /usr/lib/libc.so.6
#1  0x00007fde5e1919f2 in ?? () from /usr/lib/libxcb.so.1
#2  0x00007fde5e19356f in xcb_wait_for_event () from /usr/lib/libxcb.so.1
#3  0x00007fde4c48efe9 in QXcbEventReader::run (this=0x80e4d0) at /home/afiestas/kde5/qt5/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:1202
#4  0x00007fde59c0415f in QThreadPrivate::start (arg=0x80e4d0) at /home/afiestas/kde5/qt5/qtbase/src/corelib/thread/qthread_unix.cpp:331
#5  0x00007fde57c95354 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007fde5900abfd in clone () from /usr/lib/libc.so.6

Thread 7 (Thread 0x7fde435ef700 (LWP 1517)):
#0  0x00007fde59001e8d in poll () from /usr/lib/libc.so.6
#1  0x00007fde52284c7c in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fde52284d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007fde59e27b1b in QEventDispatcherGlib::processEvents (this=0x7fde3c0008c0, flags=...) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:420
#4  0x00007fde59dd1e3a in QEventLoop::exec (this=this@entry=0x7fde435eed70, flags=..., flags@entry=...) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qeventloop.cpp:204
#5  0x00007fde59bff35c in QThread::exec (this=this@entry=0x90f9f0) at /home/afiestas/kde5/qt5/qtbase/src/corelib/thread/qthread.cpp:503
#6  0x00007fde5cfdc585 in QQmlThreadPrivate::run (this=0x90f9f0) at /home/afiestas/kde5/qt5/qtdeclarative/src/qml/qml/ftw/qqmlthread.cpp:141
#7  0x00007fde59c0415f in QThreadPrivate::start (arg=0x90f9f0) at /home/afiestas/kde5/qt5/qtbase/src/corelib/thread/qthread_unix.cpp:331
#8  0x00007fde57c95354 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007fde5900abfd in clone () from /usr/lib/libc.so.6

Thread 6 (Thread 0x7fde38f62700 (LWP 1547)):
#0  0x00007fde59001e8d in poll () from /usr/lib/libc.so.6
#1  0x00007fde52284c7c in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fde52284d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007fde59e27b1b in QEventDispatcherGlib::processEvents (this=0x7fde340008c0, flags=...) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:420
#4  0x00007fde59dd1e3a in QEventLoop::exec (this=this@entry=0x7fde38f61d70, flags=..., flags@entry=...) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qeventloop.cpp:204
#5  0x00007fde59bff35c in QThread::exec (this=this@entry=0x1542660) at /home/afiestas/kde5/qt5/qtbase/src/corelib/thread/qthread.cpp:503
#6  0x00007fde5cfdc585 in QQmlThreadPrivate::run (this=0x1542660) at /home/afiestas/kde5/qt5/qtdeclarative/src/qml/qml/ftw/qqmlthread.cpp:141
#7  0x00007fde59c0415f in QThreadPrivate::start (arg=0x1542660) at /home/afiestas/kde5/qt5/qtbase/src/corelib/thread/qthread_unix.cpp:331
#8  0x00007fde57c95354 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007fde5900abfd in clone () from /usr/lib/libc.so.6

Thread 5 (Thread 0x7fde331fd700 (LWP 1588)):
#0  0x00007fde59001e8d in poll () from /usr/lib/libc.so.6
#1  0x00007fde52284c7c in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fde52284d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007fde59e27b1b in QEventDispatcherGlib::processEvents (this=0x7fde2c0008c0, flags=...) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:420
#4  0x00007fde59dd1e3a in QEventLoop::exec (this=this@entry=0x7fde331fcd70, flags=..., flags@entry=...) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qeventloop.cpp:204
#5  0x00007fde59bff35c in QThread::exec (this=this@entry=0x1548a10) at /home/afiestas/kde5/qt5/qtbase/src/corelib/thread/qthread.cpp:503
#6  0x00007fde5cfdc585 in QQmlThreadPrivate::run (this=0x1548a10) at /home/afiestas/kde5/qt5/qtdeclarative/src/qml/qml/ftw/qqmlthread.cpp:141
#7  0x00007fde59c0415f in QThreadPrivate::start (arg=0x1548a10) at /home/afiestas/kde5/qt5/qtbase/src/corelib/thread/qthread_unix.cpp:331
#8  0x00007fde57c95354 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007fde5900abfd in clone () from /usr/lib/libc.so.6

Thread 4 (Thread 0x7fde31919700 (LWP 1590)):
#0  0x00007fde57c9a96f in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007fde5fa9ca04 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7fde5fb851c0 <QTWTF::pageheap_memory>) at /home/afiestas/kde5/qt5/qtscript/src/3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007fde5fa9ca49 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at /home/afiestas/kde5/qt5/qtscript/src/3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007fde57c95354 in start_thread () from /usr/lib/libpthread.so.0
#4  0x00007fde5900abfd in clone () from /usr/lib/libc.so.6

Thread 3 (Thread 0x7fddaad96700 (LWP 1591)):
#0  0x00007fde59001e8d in poll () from /usr/lib/libc.so.6
#1  0x00007fde52284c7c in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fde52284d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007fde59e27b1b in QEventDispatcherGlib::processEvents (this=0x7fdda40008c0, flags=...) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:420
#4  0x00007fde59dd1e3a in QEventLoop::exec (this=this@entry=0x7fddaad95d30, flags=..., flags@entry=...) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qeventloop.cpp:204
#5  0x00007fde59bff35c in QThread::exec (this=this@entry=0x162d920) at /home/afiestas/kde5/qt5/qtbase/src/corelib/thread/qthread.cpp:503
#6  0x00007fde5d9a2682 in QQuickPixmapReader::run (this=0x162d920) at /home/afiestas/kde5/qt5/qtdeclarative/src/quick/util/qquickpixmapcache.cpp:754
#7  0x00007fde59c0415f in QThreadPrivate::start (arg=0x162d920) at /home/afiestas/kde5/qt5/qtbase/src/corelib/thread/qthread_unix.cpp:331
#8  0x00007fde57c95354 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007fde5900abfd in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7fdd9db25700 (LWP 1602)):
#0  0x00007ffcef26fba4 in clock_gettime ()
#1  0x00007fde5901777d in clock_gettime () from /usr/lib/libc.so.6
#2  0x00007fde59caf536 in qt_clock_gettime (ts=0x7fdd9db24b30, clock=<optimized out>) at /home/afiestas/kde5/qt5/qtbase/src/corelib/tools/qelapsedtimer_unix.cpp:105
#3  do_gettime (frac=<synthetic pointer>, sec=<synthetic pointer>) at /home/afiestas/kde5/qt5/qtbase/src/corelib/tools/qelapsedtimer_unix.cpp:156
#4  qt_gettime () at /home/afiestas/kde5/qt5/qtbase/src/corelib/tools/qelapsedtimer_unix.cpp:165
#5  0x00007fde59e256d9 in QTimerInfoList::updateCurrentTime (this=this@entry=0x7fdd980030d0) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qtimerinfo_unix.cpp:84
#6  0x00007fde59e271f7 in timerSourceCheckHelper (src=0x7fdd98003070) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:141
#7  idleTimerSourceCheck (source=<optimized out>) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:218
#8  0x00007fde52284681 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#9  0x00007fde52284c20 in ?? () from /usr/lib/libglib-2.0.so.0
#10 0x00007fde52284d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#11 0x00007fde59e27b1b in QEventDispatcherGlib::processEvents (this=0x7fdd980008c0, flags=...) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:420
#12 0x00007fde59dd1e3a in QEventLoop::exec (this=this@entry=0x7fdd9db24d40, flags=..., flags@entry=...) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qeventloop.cpp:204
#13 0x00007fde59bff35c in QThread::exec (this=<optimized out>) at /home/afiestas/kde5/qt5/qtbase/src/corelib/thread/qthread.cpp:503
#14 0x00007fdda0079851 in KCupsConnection::run (this=0x36834b0) at /home/afiestas/kde5/source/print-manager/libkcups/KCupsConnection.cpp:303
#15 0x00007fde59c0415f in QThreadPrivate::start (arg=0x36834b0) at /home/afiestas/kde5/qt5/qtbase/src/corelib/thread/qthread_unix.cpp:331
#16 0x00007fde57c95354 in start_thread () from /usr/lib/libpthread.so.0
#17 0x00007fde5900abfd in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7fde4c6c6840 (LWP 1478)):
[KCrash Handler]
#6  QXcbScreen::mapToNative (this=this@entry=0x0, rect=...) at /home/afiestas/kde5/qt5/qtbase/src/plugins/platforms/xcb/qxcbscreen.cpp:299
#7  0x00007fde4c4a4093 in QXcbWindow::mapToNative (this=<optimized out>, rect=..., screen=0x0) at /home/afiestas/kde5/qt5/qtbase/src/plugins/platforms/xcb/qxcbwindow.cpp:199
#8  0x00007fde4c4a56ca in QXcbWindow::propagateSizeHints (this=0x3e51820) at /home/afiestas/kde5/qt5/qtbase/src/plugins/platforms/xcb/qxcbwindow.cpp:1590
#9  0x00007fde4c4aa58c in QXcbWindow::setGeometry (this=0x3e51820, rect=...) at /home/afiestas/kde5/qt5/qtbase/src/plugins/platforms/xcb/qxcbwindow.cpp:709
#10 0x00007fde5a113cd4 in QWindow::setPosition (this=0x394c3c0, pt=...) at /home/afiestas/kde5/qt5/qtbase/src/gui/kernel/qwindow.cpp:1531
#11 0x00007fde5fbd3463 in PlasmaQuick::Dialog::setVisible (this=0x394c3c0, visible=false) at /home/afiestas/kde5/source/plasma-framework/src/plasmaquick/dialog.cpp:1231
#12 0x00007fde423b4b11 in ToolTip::~ToolTip (this=0x323e590, __in_chrg=<optimized out>) at /home/afiestas/kde5/source/plasma-framework/src/declarativeimports/core/tooltip.cpp:64
#13 0x00007fde4239a08f in QQmlPrivate::QQmlElement<ToolTip>::~QQmlElement (this=0x323e590, __in_chrg=<optimized out>) at /opt/qt5/include/QtQml/qqmlprivate.h:98
#14 0x00007fde4239a0c4 in QQmlPrivate::QQmlElement<ToolTip>::~QQmlElement (this=0x323e590, __in_chrg=<optimized out>) at /opt/qt5/include/QtQml/qqmlprivate.h:98
#15 0x00007fde59dff63b in QObjectPrivate::deleteChildren (this=this@entry=0x31b2480) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qobject.cpp:1951
#16 0x00007fde59e08e40 in QObject::~QObject (this=<optimized out>, __in_chrg=<optimized out>) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qobject.cpp:1031
#17 0x00007fde5da30666 in QQuickItem::~QQuickItem (this=0x41f5800, __in_chrg=<optimized out>) at /home/afiestas/kde5/qt5/qtdeclarative/src/quick/items/qquickitem.cpp:2224
#18 0x00007fde423af4a2 in Plasma::FrameSvgItem::~FrameSvgItem (this=0x41f5800, __in_chrg=<optimized out>) at /home/afiestas/kde5/source/plasma-framework/src/declarativeimports/core/framesvgitem.cpp:272
#19 0x00007fde4239a3b3 in QQmlPrivate::QQmlElement<Plasma::FrameSvgItem>::~QQmlElement (this=0x41f5800, __in_chrg=<optimized out>) at /opt/qt5/include/QtQml/qqmlprivate.h:98
#20 0x00007fde4239a3e8 in QQmlPrivate::QQmlElement<Plasma::FrameSvgItem>::~QQmlElement (this=0x41f5800, __in_chrg=<optimized out>) at /opt/qt5/include/QtQml/qqmlprivate.h:98
#21 0x00007fde59dff63b in QObjectPrivate::deleteChildren (this=this@entry=0x32447a0) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qobject.cpp:1951
#22 0x00007fde59e08e40 in QObject::~QObject (this=<optimized out>, __in_chrg=<optimized out>) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qobject.cpp:1031
#23 0x00007fde5da30666 in QQuickItem::~QQuickItem (this=0x40058b0, __in_chrg=<optimized out>) at /home/afiestas/kde5/qt5/qtdeclarative/src/quick/items/qquickitem.cpp:2224
#24 0x00007fde5da4a126 in ~QQmlElement (this=0x40058b0, __in_chrg=<optimized out>) at ../../include/QtQml/../../../../qtdeclarative/src/qml/qml/qqmlprivate.h:98
#25 QQmlPrivate::QQmlElement<QQuickMouseArea>::~QQmlElement (this=0x40058b0, __in_chrg=<optimized out>) at ../../include/QtQml/../../../../qtdeclarative/src/qml/qml/qqmlprivate.h:98
#26 0x00007fde59e01e70 in QObject::event (this=this@entry=0x40058b0, e=e@entry=0x315eca0) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qobject.cpp:1237
#27 0x00007fde5da2efdb in QQuickItem::event (this=0x40058b0, ev=0x315eca0) at /home/afiestas/kde5/qt5/qtdeclarative/src/quick/items/qquickitem.cpp:7294
#28 0x00007fde5a9821ac in QApplicationPrivate::notify_helper (this=this@entry=0x7f63c0, receiver=receiver@entry=0x40058b0, e=e@entry=0x315eca0) at /home/afiestas/kde5/qt5/qtbase/src/widgets/kernel/qapplication.cpp:3717
#29 0x00007fde5a9872c6 in QApplication::notify (this=0x7ffcef21b370, receiver=0x40058b0, e=0x315eca0) at /home/afiestas/kde5/qt5/qtbase/src/widgets/kernel/qapplication.cpp:3500
#30 0x00007fde59dd42d3 in QCoreApplication::notifyInternal (this=0x7ffcef21b370, receiver=0x40058b0, event=event@entry=0x315eca0) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:965
#31 0x00007fde59dd65f6 in sendEvent (event=0x315eca0, receiver=<optimized out>) at ../../include/QtCore/../../../../qtbase/src/corelib/kernel/qcoreapplication.h:224
#32 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x7ec720) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1593
#33 0x00007fde59dd6ad8 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1451
#34 0x00007fde59e276f3 in postEventSourceDispatch (s=0x830ac0) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:271
#35 0x00007fde522849fd in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#36 0x00007fde52284ce0 in ?? () from /usr/lib/libglib-2.0.so.0
#37 0x00007fde52284d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#38 0x00007fde59e27aff in QEventDispatcherGlib::processEvents (this=0x83c580, flags=...) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:418
#39 0x00007fde59dd1e3a in QEventLoop::exec (this=this@entry=0x7ffcef21b240, flags=..., flags@entry=...) at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qeventloop.cpp:204
#40 0x00007fde59dd99cd in QCoreApplication::exec () at /home/afiestas/kde5/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1229
#41 0x000000000046c808 in main (argc=2, argv=0x7ffcef21b988) at /home/afiestas/kde5/source/plasma-workspace/shell/main.cpp:155

Reported using DrKonqi
Comment 1 Lindsay Roberts 2015-07-23 07:14:32 UTC 
Confirmed locally, same core trace from both Plasma and Konsole. Qt 5.5.0.
Comment 2 Alex Richardson 2015-07-27 15:41:06 UTC 
I also get this crash with Qt 5.5.0. Seems to happen every time when I connect an external monitor after suspend.
Comment 3 Lindsay Roberts 2015-07-27 19:13:44 UTC 
Added probably upstream bug at https://bugreports.qt.io/browse/QTBUG-42985 .
Comment 4 David Edmundson 2015-08-03 22:21:51 UTC 
*** Bug 350940 has been marked as a duplicate of this bug. ***
Comment 5 David Edmundson 2015-08-16 18:22:23 UTC 
*** Bug 351359 has been marked as a duplicate of this bug. ***
Comment 6 le.trmr 2015-08-17 19:00:10 UTC 
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fa7f7723800 (LWP 886))]

Thread 21 (Thread 0x7fa7e0c18700 (LWP 889)):
#0  0x00007fa7f107918d in poll () from /usr/lib/libc.so.6
#1  0x00007fa7f60869f2 in ?? () from /usr/lib/libxcb.so.1
#2  0x00007fa7f608856f in xcb_wait_for_event () from /usr/lib/libxcb.so.1
#3  0x00007fa7e2333ca9 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#4  0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#6  0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 20 (Thread 0x7fa7da2d4700 (LWP 909)):
#0  0x00007ffcf53c8c66 in clock_gettime ()
#1  0x00007fa7f108ed26 in clock_gettime () from /usr/lib/libc.so.6
#2  0x00007fa7f182a236 in ?? () from /usr/lib/libQt5Core.so.5
#3  0x00007fa7f19aece9 in QTimerInfoList::updateCurrentTime() () from /usr/lib/libQt5Core.so.5
#4  0x00007fa7f19af255 in QTimerInfoList::timerWait(timespec&) () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f19b063e in ?? () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7ed31c1bd in g_main_context_prepare () from /usr/lib/libglib-2.0.so.0
#7  0x00007fa7ed31cba8 in ?? () from /usr/lib/libglib-2.0.so.0
#8  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#9  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#10 0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#11 0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#12 0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#13 0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#14 0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#15 0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 19 (Thread 0x7fa7cd067700 (LWP 921)):
#0  0x00007fa7ed3613f9 in g_mutex_lock () from /usr/lib/libglib-2.0.so.0
#1  0x00007fa7ed31c097 in g_main_context_prepare () from /usr/lib/libglib-2.0.so.0
#2  0x00007fa7ed31cba8 in ?? () from /usr/lib/libglib-2.0.so.0
#3  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#4  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#7  0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#8  0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#9  0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#10 0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 18 (Thread 0x7fa7c7535700 (LWP 938)):
#0  0x00007ffcf53c8c66 in clock_gettime ()
#1  0x00007fa7f108ed26 in clock_gettime () from /usr/lib/libc.so.6
#2  0x00007fa7f182a236 in ?? () from /usr/lib/libQt5Core.so.5
#3  0x00007fa7f19aece9 in QTimerInfoList::updateCurrentTime() () from /usr/lib/libQt5Core.so.5
#4  0x00007fa7f19af255 in QTimerInfoList::timerWait(timespec&) () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f19b063e in ?? () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7ed31c1bd in g_main_context_prepare () from /usr/lib/libglib-2.0.so.0
#7  0x00007fa7ed31cba8 in ?? () from /usr/lib/libglib-2.0.so.0
#8  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#9  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#10 0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#11 0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#12 0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#13 0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#14 0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#15 0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 17 (Thread 0x7fa7c6474700 (LWP 943)):
#0  0x00007fa7f107918d in poll () from /usr/lib/libc.so.6
#1  0x00007fa7ed31cc7c in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#4  0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#7  0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 16 (Thread 0x7fa7c5373700 (LWP 945)):
#0  0x00007ffcf53c8c66 in clock_gettime ()
#1  0x00007fa7f108ed26 in clock_gettime () from /usr/lib/libc.so.6
#2  0x00007fa7f182a236 in ?? () from /usr/lib/libQt5Core.so.5
#3  0x00007fa7f19aece9 in QTimerInfoList::updateCurrentTime() () from /usr/lib/libQt5Core.so.5
#4  0x00007fa7f19af255 in QTimerInfoList::timerWait(timespec&) () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f19b063e in ?? () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7ed31c1bd in g_main_context_prepare () from /usr/lib/libglib-2.0.so.0
#7  0x00007fa7ed31cba8 in ?? () from /usr/lib/libglib-2.0.so.0
#8  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#9  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#10 0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#11 0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#12 0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#13 0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#14 0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#15 0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 15 (Thread 0x7fa7b7fff700 (LWP 947)):
#0  0x00007fa7f107918d in poll () from /usr/lib/libc.so.6
#1  0x00007fa7ed31cc7c in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#4  0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#7  0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 14 (Thread 0x7fa7b69bf700 (LWP 950)):
#0  0x00007fa7f108e712 in __libc_disable_asynccancel () from /usr/lib/libc.so.6
#1  0x00007fa7f1075179 in read () from /usr/lib/libc.so.6
#2  0x00007fa7ed35ff60 in ?? () from /usr/lib/libglib-2.0.so.0
#3  0x00007fa7ed31c72c in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#4  0x00007fa7ed31cc20 in ?? () from /usr/lib/libglib-2.0.so.0
#5  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#6  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#7  0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#8  0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#9  0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#10 0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#11 0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#12 0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 13 (Thread 0x7fa7b55ad700 (LWP 951)):
#0  0x00007ffcf53c8c66 in clock_gettime ()
#1  0x00007fa7f108ed26 in clock_gettime () from /usr/lib/libc.so.6
#2  0x00007fa7f182a236 in ?? () from /usr/lib/libQt5Core.so.5
#3  0x00007fa7f19aece9 in QTimerInfoList::updateCurrentTime() () from /usr/lib/libQt5Core.so.5
#4  0x00007fa7f19af255 in QTimerInfoList::timerWait(timespec&) () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f19b063e in ?? () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7ed31c1bd in g_main_context_prepare () from /usr/lib/libglib-2.0.so.0
#7  0x00007fa7ed31cba8 in ?? () from /usr/lib/libglib-2.0.so.0
#8  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#9  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#10 0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#11 0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#12 0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#13 0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#14 0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#15 0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 12 (Thread 0x7fa7a7fff700 (LWP 954)):
#0  0x00007fa7f067707f in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007fa7f6eb8564 in ?? () from /usr/lib/libQt5Script.so.5
#2  0x00007fa7f6eb85a9 in ?? () from /usr/lib/libQt5Script.so.5
#3  0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#4  0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 11 (Thread 0x7fa71fb3e700 (LWP 976)):
#0  0x00007ffcf53c8c66 in clock_gettime ()
#1  0x00007fa7f108ed26 in clock_gettime () from /usr/lib/libc.so.6
#2  0x00007fa7f182a236 in ?? () from /usr/lib/libQt5Core.so.5
#3  0x00007fa7f19aece9 in QTimerInfoList::updateCurrentTime() () from /usr/lib/libQt5Core.so.5
#4  0x00007fa7f19af255 in QTimerInfoList::timerWait(timespec&) () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f19b063e in ?? () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7ed31c1bd in g_main_context_prepare () from /usr/lib/libglib-2.0.so.0
#7  0x00007fa7ed31cba8 in ?? () from /usr/lib/libglib-2.0.so.0
#8  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#9  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#10 0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#11 0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#12 0x00007fa7f51891f6 in ?? () from /usr/lib/libQt5Quick.so.5
#13 0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#14 0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#15 0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 10 (Thread 0x7fa715c0b700 (LWP 1050)):
#0  0x00007ffcf53c8c66 in clock_gettime ()
#1  0x00007fa7f108ed26 in clock_gettime () from /usr/lib/libc.so.6
#2  0x00007fa7f182a236 in ?? () from /usr/lib/libQt5Core.so.5
#3  0x00007fa7f19aece9 in QTimerInfoList::updateCurrentTime() () from /usr/lib/libQt5Core.so.5
#4  0x00007fa7f19af255 in QTimerInfoList::timerWait(timespec&) () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f19b063e in ?? () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7ed31c1bd in g_main_context_prepare () from /usr/lib/libglib-2.0.so.0
#7  0x00007fa7ed31cba8 in ?? () from /usr/lib/libglib-2.0.so.0
#8  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#9  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#10 0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#11 0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#12 0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#13 0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#14 0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#15 0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 9 (Thread 0x7fa714b07700 (LWP 1051)):
#0  0x00007fa7f107516d in read () from /usr/lib/libc.so.6
#1  0x00007fa7ed35ff60 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fa7ed31c72c in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#3  0x00007fa7ed31cc20 in ?? () from /usr/lib/libglib-2.0.so.0
#4  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#5  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#7  0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#8  0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#9  0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#10 0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#11 0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 8 (Thread 0x7fa703d6d700 (LWP 1068)):
#0  0x00007fa7f107918d in poll () from /usr/lib/libc.so.6
#1  0x00007fa7ed31cc7c in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#4  0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007fa70a4e6a47 in KCupsConnection::run() () from /usr/lib/libkcupslib.so
#7  0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 7 (Thread 0x7fa7032bf700 (LWP 1070)):
#0  0x00007ffcf53c8c66 in clock_gettime ()
#1  0x00007fa7f108ed26 in clock_gettime () from /usr/lib/libc.so.6
#2  0x00007fa7f182a236 in ?? () from /usr/lib/libQt5Core.so.5
#3  0x00007fa7f19aece9 in QTimerInfoList::updateCurrentTime() () from /usr/lib/libQt5Core.so.5
#4  0x00007fa7f19af255 in QTimerInfoList::timerWait(timespec&) () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f19b063e in ?? () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7ed31c1bd in g_main_context_prepare () from /usr/lib/libglib-2.0.so.0
#7  0x00007fa7ed31cba8 in ?? () from /usr/lib/libglib-2.0.so.0
#8  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#9  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#10 0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#11 0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#12 0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#13 0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#14 0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#15 0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 6 (Thread 0x7fa7021ce700 (LWP 1071)):
#0  0x00007fa7ed31cd96 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#1  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#2  0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#3  0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#4  0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#5  0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#7  0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 5 (Thread 0x7fa7010cd700 (LWP 1072)):
#0  0x00007fa7ed319c77 in ?? () from /usr/lib/libglib-2.0.so.0
#1  0x00007fa7ed31c5af in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#2  0x00007fa7ed31cc20 in ?? () from /usr/lib/libglib-2.0.so.0
#3  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#4  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#7  0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#8  0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#9  0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#10 0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 4 (Thread 0x7fa6fbfbf700 (LWP 1073)):
#0  0x00007fa7ed3613f9 in g_mutex_lock () from /usr/lib/libglib-2.0.so.0
#1  0x00007fa7ed31cc3e in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#4  0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#7  0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#8  0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 3 (Thread 0x7fa7277fe700 (LWP 4709)):
#0  0x00007ffcf53c8c66 in clock_gettime ()
#1  0x00007fa7f108ed26 in clock_gettime () from /usr/lib/libc.so.6
#2  0x00007fa7f182a236 in ?? () from /usr/lib/libQt5Core.so.5
#3  0x00007fa7f19aece9 in QTimerInfoList::updateCurrentTime() () from /usr/lib/libQt5Core.so.5
#4  0x00007fa7f19af255 in QTimerInfoList::timerWait(timespec&) () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f19b063e in ?? () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7ed31c1bd in g_main_context_prepare () from /usr/lib/libglib-2.0.so.0
#7  0x00007fa7ed31cba8 in ?? () from /usr/lib/libglib-2.0.so.0
#8  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#9  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#10 0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#11 0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#12 0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#13 0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#14 0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#15 0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7fa71e73d700 (LWP 4710)):
#0  0x00007fa7f19b05ea in ?? () from /usr/lib/libQt5Core.so.5
#1  0x00007fa7ed31c1bd in g_main_context_prepare () from /usr/lib/libglib-2.0.so.0
#2  0x00007fa7ed31cba8 in ?? () from /usr/lib/libglib-2.0.so.0
#3  0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#4  0x00007fa7f19b125b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#6  0x00007fa7f1774af4 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#7  0x00007fa7f4b01345 in ?? () from /usr/lib/libQt5Qml.so.5
#8  0x00007fa7f1779a9e in ?? () from /usr/lib/libQt5Core.so.5
#9  0x00007fa7f06714a4 in start_thread () from /usr/lib/libpthread.so.0
#10 0x00007fa7f108212d in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7fa7f7723800 (LWP 886)):
[KCrash Handler]
#5  0x00007fa7e234447e in QXcbScreen::mapToNative(QRect const&) const () from /usr/lib/libQt5XcbQpa.so.5
#6  0x00007fa7e2349683 in QXcbWindow::mapToNative(QRect const&, QXcbScreen const*) const () from /usr/lib/libQt5XcbQpa.so.5
#7  0x00007fa7e234ae7b in QXcbWindow::propagateSizeHints() () from /usr/lib/libQt5XcbQpa.so.5
#8  0x00007fa7e234fcec in QXcbWindow::setGeometry(QRect const&) () from /usr/lib/libQt5XcbQpa.so.5
#9  0x00007fa7f1ebffb4 in QWindow::setPosition(QPoint const&) () from /usr/lib/libQt5Gui.so.5
#10 0x00007fa7f71e7b54 in PlasmaQuick::Dialog::setVisible(bool) () from /usr/lib/libKF5PlasmaQuick.so.5
#11 0x00007fa7f1988e77 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#12 0x00007fa7f1995f38 in QTimer::timerEvent(QTimerEvent*) () from /usr/lib/libQt5Core.so.5
#13 0x00007fa7f1989e63 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#14 0x00007fa7f2d2900c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#15 0x00007fa7f2d2e4e6 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#16 0x00007fa7f195a89b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#17 0x00007fa7f19b005d in QTimerInfoList::activateTimers() () from /usr/lib/libQt5Core.so.5
#18 0x00007fa7f19b0561 in ?? () from /usr/lib/libQt5Core.so.5
#19 0x00007fa7ed31c9fd in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#20 0x00007fa7ed31cce0 in ?? () from /usr/lib/libglib-2.0.so.0
#21 0x00007fa7ed31cd8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#22 0x00007fa7f19b123f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#23 0x00007fa7f195826a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#24 0x00007fa7f196020c in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#25 0x000000000042ed66 in main ()
Comment 7 le.trmr 2015-08-22 10:33:21 UTC 
Created attachment 94163 [details]
New crash information added by DrKonqi

plasmashell (5.3.2) using Qt 5.5.0

- What I was doing when the application crashed:
Start up machine. Change display to external.

- Unusual behavior I noticed:
Flickering. Taskbar vanishes and reappears (plasmashell restart).

Manjaro

-- Backtrace (Reduced):
#5  0x00007fdab1ca147e in QXcbScreen::mapToNative(QRect const&) const () from /usr/lib/libQt5XcbQpa.so.5
#6  0x00007fdab1ca6683 in QXcbWindow::mapToNative(QRect const&, QXcbScreen const*) const () from /usr/lib/libQt5XcbQpa.so.5
#7  0x00007fdab1ca7e7b in QXcbWindow::propagateSizeHints() () from /usr/lib/libQt5XcbQpa.so.5
#8  0x00007fdab1caccec in QXcbWindow::setGeometry(QRect const&) () from /usr/lib/libQt5XcbQpa.so.5
#9  0x00007fdac181cfb4 in QWindow::setPosition(QPoint const&) () from /usr/lib/libQt5Gui.so.5
Comment 8 David Edmundson 2015-08-22 11:37:10 UTC 
*** Bug 350195 has been marked as a duplicate of this bug. ***
Comment 9 Christoph Cullmann 2015-10-05 11:47:53 UTC 
This issue is my personal friend. It is a known issue in Qt since 5.4.x, not fixed.
See:
https://bugreports.qt.io/browse/QTBUG-42985
There are more bugs around that issue in the Qt bug tracker but that backtrace is one of the many ways to doom there :(
Comment 10 David Edmundson 2016-01-16 14:56:28 UTC 
*** Bug 358020 has been marked as a duplicate of this bug. ***