Description of problem: I can't give step by step, as I think I was trying to open the screen locker control panel after experiencing the kscreenlocker bug I just reported. The system chugged a few moments, a small outline of a window appeared, but before it filled in, it disappeared and asked me to report this bug. Version-Release number of selected component: kde-cli-tools-5.5.0-1.fc23 Additional info: reporter: libreport-2.6.3 backtrace_rating: 4 cmdline: /usr/bin/kcmshell5 screenlocker crash_function: qt_message_fatal executable: /usr/bin/kcmshell5 global_pid: 26325 kernel: 4.2.7-300.fc23.x86_64 runlevel: N 5 type: CCpp uid: 1000 Truncated backtrace: Thread no. 1 (10 frames) #2 qt_message_fatal at global/qlogging.cpp:1578 #3 QMessageLogger::fatal at global/qlogging.cpp:781 #4 QSGRenderLoop::handleContextCreationFailure at /usr/src/debug/qtdeclarative-opensource-src-5.5.1/src/quick/scenegraph/qsgrenderloop.cpp:244 #5 QSGThreadedRenderLoop::handleExposure at /usr/src/debug/qtdeclarative-opensource-src-5.5.1/src/quick/scenegraph/qsgthreadedrenderloop.cpp:919 #6 QSGThreadedRenderLoop::exposureChanged at /usr/src/debug/qtdeclarative-opensource-src-5.5.1/src/quick/scenegraph/qsgthreadedrenderloop.cpp:857 #7 QWindow::event at kernel/qwindow.cpp:2053 #8 QQuickWindow::event at /usr/src/debug/qtdeclarative-opensource-src-5.5.1/src/quick/items/qquickwindow.cpp:1413 #9 QApplicationPrivate::notify_helper at kernel/qapplication.cpp:3716 #10 QApplication::notify at kernel/qapplication.cpp:3499 #11 QCoreApplication::notifyInternal at kernel/qcoreapplication.cpp:965
Created attachment 1107829 [details] File: backtrace
Created attachment 1107830 [details] File: cgroup
Created attachment 1107831 [details] File: core_backtrace
Created attachment 1107832 [details] File: dso_list
Created attachment 1107833 [details] File: environ
Created attachment 1107834 [details] File: limits
Created attachment 1107835 [details] File: maps
Created attachment 1107836 [details] File: mountinfo
Created attachment 1107837 [details] File: namespaces
Created attachment 1107838 [details] File: open_fds
Created attachment 1107839 [details] File: proc_pid_status
Created attachment 1107840 [details] File: var_log_messages
Looks similar to the other crash you reported... I would suspect the opengl wasn't working due to your driver changes.
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