Version-Release number of selected component:
plasma-workspace-5.4.1-3.fc24

Additional info:
reporter:       libreport-2.6.2
backtrace_rating: 4
cmdline:        /usr/libexec/kscreenlocker_greet --immediateLock --ksldfd 31
crash_function: KCrash::defaultCrashHandler
executable:     /usr/libexec/kscreenlocker_greet
global_pid:     7465
kernel:         4.3.0-0.rc0.git14.1.fc24.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #1 KCrash::defaultCrashHandler at ../../src/kcrash.cpp:409
 #3 QXcbConnection::sendConnectionEvent at qxcbconnection.cpp:1260
 #4 QXcbConnection::~QXcbConnection at qxcbconnection.cpp:573
 #6 qDeleteAll<QList<QXcbConnection*>::const_iterator> at ../../../../src/corelib/tools/qalgorithms.h:317
 #7 qDeleteAll<QList<QXcbConnection*> > at ../../../../src/corelib/tools/qalgorithms.h:325
 #8 QXcbIntegration::~QXcbIntegration at qxcbintegration.cpp:190
 #10 QGuiApplicationPrivate::~QGuiApplicationPrivate at kernel/qguiapplication.cpp:1391
 #12 QScopedPointerDeleter<QObjectData>::cleanup at ../../src/corelib/tools/qscopedpointer.h:54
 #13 QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData> >::~QScopedPointer at ../../src/corelib/tools/qscopedpointer.h:101
 #14 QObject::~QObject at kernel/qobject.cpp:883

Potential duplicate: bug 1262615