Application: plasmashell (5.5.5)
 (Compiled from sources)
Qt Version: 5.5.1
Operating System: Linux 4.4.6-gentoo x86_64
Distribution: "NAME=Gentoo"

-- Information about the crash:
- What I was doing when the application crashed:
Turned the monitor back on after having turned it off earlier

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f96bbdf4780 (LWP 4442))]

Thread 7 (Thread 0x7f96a9749700 (LWP 4447)):
#0  0x00007f96b65683ed in poll () from /lib64/libc.so.6
#1  0x00007f96ba582ac2 in ?? () from /usr/lib64/libxcb.so.1
#2  0x00007f96ba58472f in xcb_wait_for_event () from /usr/lib64/libxcb.so.1
#3  0x00007f96ab27dc89 in ?? () from /usr/lib64/libQt5XcbQpa.so.5
#4  0x00007f96b6c1c2a2 in ?? () from /usr/lib64/libQt5Core.so.5
#5  0x00007f96b5d79434 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f96b657150d in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7f96a250f700 (LWP 4472)):
#0  0x00007f96b65683ed in poll () from /lib64/libc.so.6
#1  0x00007f96b2393f2c in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f96b239403c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f96b6e185ac in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#4  0x00007f96b6dc97ba in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#5  0x00007f96b6c17834 in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#6  0x00007f96b94215f5 in ?? () from /usr/lib64/libQt5Qml.so.5
#7  0x00007f96b6c1c2a2 in ?? () from /usr/lib64/libQt5Core.so.5
#8  0x00007f96b5d79434 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f96b657150d in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7f969ab72700 (LWP 4488)):
#0  0x00007f96b65683ed in poll () from /lib64/libc.so.6
#1  0x00007f96b2393f2c in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f96b239403c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f96b6e185ac in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#4  0x00007f96b6dc97ba in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#5  0x00007f96b6c17834 in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#6  0x00007f96b94215f5 in ?? () from /usr/lib64/libQt5Qml.so.5
#7  0x00007f96b6c1c2a2 in ?? () from /usr/lib64/libQt5Core.so.5
#8  0x00007f96b5d79434 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f96b657150d in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7f9699335700 (LWP 4507)):
#0  0x00007f96b2390f8d in ?? () from /usr/lib64/libglib-2.0.so.0
#1  0x00007f96b239340b in g_main_context_prepare () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f96b2393e58 in ?? () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f96b239403c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#4  0x00007f96b6e185ac in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#5  0x00007f96b6dc97ba in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#6  0x00007f96b6c17834 in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#7  0x00007f96b94215f5 in ?? () from /usr/lib64/libQt5Qml.so.5
#8  0x00007f96b6c1c2a2 in ?? () from /usr/lib64/libQt5Core.so.5
#9  0x00007f96b5d79434 in start_thread () from /lib64/libpthread.so.0
#10 0x00007f96b657150d in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7f9693995700 (LWP 4526)):
#0  0x00007f96b5d7f00f in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f96bb81e924 in ?? () from /usr/lib64/libQt5Script.so.5
#2  0x00007f96bb81e969 in ?? () from /usr/lib64/libQt5Script.so.5
#3  0x00007f96b5d79434 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f96b657150d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f9690d02700 (LWP 4527)):
#0  0x00007f96b65643cd in read () from /lib64/libc.so.6
#1  0x00007f96b23d66c0 in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f96b23939dc in g_main_context_check () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f96b2393ed0 in ?? () from /usr/lib64/libglib-2.0.so.0
#4  0x00007f96b239403c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#5  0x00007f96b6e185ac in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#6  0x00007f96b6dc97ba in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#7  0x00007f96b6c17834 in QThread::exec() () from /usr/lib64/libQt5Core.so.5
#8  0x00007f96b9dc0ae6 in ?? () from /usr/lib64/libQt5Quick.so.5
#9  0x00007f96b6c1c2a2 in ?? () from /usr/lib64/libQt5Core.so.5
#10 0x00007f96b5d79434 in start_thread () from /lib64/libpthread.so.0
#11 0x00007f96b657150d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f96bbdf4780 (LWP 4442)):
[KCrash Handler]
#6  0x00007f96b711c5b0 in QScreen::handle() const () from /usr/lib64/libQt5Gui.so.5
#7  0x00007f96ab27f389 in QXcbIntegration::createPlatformWindow(QWindow*) const () from /usr/lib64/libQt5XcbQpa.so.5
#8  0x00007f96b70ff1c3 in QWindowPrivate::create(bool) () from /usr/lib64/libQt5Gui.so.5
#9  0x00007f96b70ff378 in QWindow::winId() const () from /usr/lib64/libQt5Gui.so.5
#10 0x00007f96bb955326 in PlasmaQuick::DialogPrivate::updateTheme (this=0x20bf220) at /var/tmp/portage/kde-frameworks/plasma-5.21.0/work/plasma-framework-5.21.0/src/plasmaquick/dialog.cpp:225
#11 0x00007f96bb957ed9 in PlasmaQuick::Dialog::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at /var/tmp/portage/kde-frameworks/plasma-5.21.0/work/plasma-5.21.0_build/src/plasmaquick/moc_dialog.cpp:223
#12 0x00007f96b6df2de4 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib64/libQt5Core.so.5
#13 0x00007f96b6df2863 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib64/libQt5Core.so.5
#14 0x00007f96b6df2de4 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib64/libQt5Core.so.5
#15 0x00007f96b6dffac8 in QTimer::timerEvent(QTimerEvent*) () from /usr/lib64/libQt5Core.so.5
#16 0x00007f96b6df3e53 in QObject::event(QEvent*) () from /usr/lib64/libQt5Core.so.5
#17 0x00007f96b761c69c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#18 0x00007f96b7621b10 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#19 0x00007f96b6dcab9d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#20 0x00007f96b6e17b7d in QTimerInfoList::activateTimers() () from /usr/lib64/libQt5Core.so.5
#21 0x00007f96b6e18051 in ?? () from /usr/lib64/libQt5Core.so.5
#22 0x00007f96b2393cad in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#23 0x00007f96b2393f90 in ?? () from /usr/lib64/libglib-2.0.so.0
#24 0x00007f96b239403c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#25 0x00007f96b6e18597 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#26 0x00007f96b6dc97ba in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#27 0x00007f96b6dd0b9c in QCoreApplication::exec() () from /usr/lib64/libQt5Core.so.5
#28 0x0000000000432bf3 in main (argc=2, argv=<optimized out>) at /var/tmp/portage/kde-plasma/plasma-workspace-5.5.5-r2/work/plasma-workspace-5.5.5/shell/main.cpp:181

Possible duplicates by query: bug 362964, bug 361082, bug 360259, bug 359372, bug 359299.

Reported using DrKonqi