Application: plasmashell (5.5.4)

Qt Version: 5.5.1
Operating System: Linux 4.2.0-34-generic x86_64
Distribution: Ubuntu 15.10

-- Information about the crash:
- What I was doing when the application crashed:
running: 
xrand --output VGA1 --auto
xrand --output VGA1 --prefered

but external monitor remain in sleep mode. Since last update I faced some problems connecting my external monitor.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f43053a1800 (LWP 1035))]

Thread 8 (Thread 0x7f42f0758700 (LWP 1038)):
#0  0x00007f42ffaac88d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f4303b7abd2 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f4303b7c74f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f42f28a17e9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f43001a2a6e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f42ff28e6aa in start_thread (arg=0x7f42f0758700) at pthread_create.c:333
#6  0x00007f42ffab7e9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f42edf4a700 (LWP 1055)):
#0  0x00007f42ffaa844d in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f42fc8854e0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f42fc841cd4 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f42fc842190 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f42fc8422fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f43003da50b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f430038150a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f430019dac4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f4302a4bc35 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f43001a2a6e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f42ff28e6aa in start_thread (arg=0x7f42edf4a700) at pthread_create.c:333
#11 0x00007f42ffab7e9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f42de907700 (LWP 1083)):
#0  0x00007f42ffaac88d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f42fc8421ec in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f42fc8422fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f43003da50b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f430038150a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f430019dac4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f4302a4bc35 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f43001a2a6e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f42ff28e6aa in start_thread (arg=0x7f42de907700) at pthread_create.c:333
#9  0x00007f42ffab7e9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f42dcaac700 (LWP 1090)):
#0  0x00007f42ffaa844d in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f42fc8854e0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f42fc841cd4 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f42fc842190 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f42fc8422fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f43003da50b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f430038150a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f430019dac4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f4302a4bc35 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f43001a2a6e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f42ff28e6aa in start_thread (arg=0x7f42dcaac700) at pthread_create.c:333
#11 0x00007f42ffab7e9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f42d6fbc700 (LWP 1137)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f4304df4194 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f4304df41d9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f42ff28e6aa in start_thread (arg=0x7f42d6fbc700) at pthread_create.c:333
#4  0x00007f42ffab7e9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f424fb4b700 (LWP 1295)):
#0  0x00007f43003d9aa1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f42fc84177d in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f42fc84211b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f42fc8422fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f43003da50b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f430038150a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f430019dac4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f43033d42a6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f43001a2a6e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f42ff28e6aa in start_thread (arg=0x7f424fb4b700) at pthread_create.c:333
#10 0x00007f42ffab7e9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f423eea7700 (LWP 1340)):
#0  0x00007f42ffaac88d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f42fc8421ec in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f42fc8422fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f43003da50b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f430038150a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f430019dac4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f424113e8f7 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007f43001a2a6e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f42ff28e6aa in start_thread (arg=0x7f423eea7700) at pthread_create.c:333
#9  0x00007f42ffab7e9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f43053a1800 (LWP 1035)):
[KCrash Handler]
#6  0x00007f42f28b250e in QXcbScreen::mapToNative(QRect const&) const () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#7  0x00007f42f28b76e3 in QXcbWindow::mapToNative(QRect const&, QXcbScreen const*) const () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#8  0x00007f42f28b8edb in QXcbWindow::propagateSizeHints() () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#9  0x00007f42f28be06c in QXcbWindow::setGeometry(QRect const&) () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#10 0x00007f42ecc68505 in ToolTipDialog::adjustGeometry (this=0x36f2bf0, geom=...) at ../../../../src/declarativeimports/core/tooltipdialog.cpp:154
#11 0x00007f4304f2308d in PlasmaQuick::DialogPrivate::syncToMainItemSize (this=this@entry=0x36f3920) at ../../../src/plasmaquick/dialog.cpp:600
#12 0x00007f4304f23d8c in PlasmaQuick::DialogPrivate::updateVisibility (this=0x36f3920, visible=visible@entry=true) at ../../../src/plasmaquick/dialog.cpp:273
#13 0x00007f4304f25aee in PlasmaQuick::Dialog::event (this=this@entry=0x36f2bf0, event=event@entry=0x7ffe0baadf80) at ../../../src/plasmaquick/dialog.cpp:1071
#14 0x00007f42ecc68d05 in ToolTipDialog::event (this=0x36f2bf0, e=0x7ffe0baadf80) at ../../../../src/declarativeimports/core/tooltipdialog.cpp:120
#15 0x00007f4300e889dc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007f4300e8dea6 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007f4300383d7b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007f43006cdc94 in QWindow::setVisible(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#19 0x00007f42ecc679f0 in ToolTip::showToolTip (this=0x5513d20) at ../../../../src/declarativeimports/core/tooltip.cpp:160
#20 0x00007f43003b2777 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007f43003bf198 in QTimer::timerEvent(QTimerEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007f43003b3763 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007f4300e889dc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007f4300e8dea6 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#25 0x00007f4300383d7b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f43003d930d in QTimerInfoList::activateTimers() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007f43003d9811 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007f42fc841ff7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007f42fc842250 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007f42fc8422fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007f43003da4ef in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007f430038150a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007f43003895ec in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#34 0x000000000043258a in main (argc=2, argv=<optimized out>) at ../../shell/main.cpp:181

Possible duplicates by query: bug 360165, bug 358020, bug 351359, bug 350940, bug 350281.

Reported using DrKonqi