going first to most obvious address - klipper's, though might be Qt/one of Frameworks...

Reproducible: Sometimes

Steps to Reproduce:
1. right click on klipper 

Actual Results:  
segfaults

Expected Results:  
menu is invoked

#0  QMenu::setSeparatorsCollapsible (this=0x933610, collapse=true) at widgets/qmenu.cpp:3244
#1  0x00007fd54f25051e in QMenu::actionEvent (this=0x810ff0, e=<optimized out>) at widgets/qmenu.cpp:3059
#2  0x00007fd54f11ad9b in QWidget::event (this=this@entry=0x810ff0, event=event@entry=0x7fffddbde280) at kernel/qwidget.cpp:8316
#3  0x00007fd54f255b1b in QMenu::event (this=0x810ff0, e=0x7fffddbde280) at widgets/qmenu.cpp:2523
#4  0x00007fd54f0dff3c in QApplicationPrivate::notify_helper (this=this@entry=0x6f9a30, receiver=receiver@entry=0x810ff0, e=e@entry=0x7fffddbde280)
    at kernel/qapplication.cpp:3522
#5  0x00007fd54f0e4fc6 in QApplication::notify (this=0x7fffddbdee00, receiver=0x810ff0, e=0x7fffddbde280) at kernel/qapplication.cpp:3305
#6  0x00007fd54e4400d5 in QCoreApplication::notifyInternal (this=0x7fffddbdee00, receiver=0x810ff0, event=event@entry=0x7fffddbde280)
    at kernel/qcoreapplication.cpp:935
#7  0x00007fd54f0da2d8 in sendEvent (event=0x7fffddbde280, receiver=<optimized out>) at ../../src/corelib/kernel/qcoreapplication.h:237
#8  QActionPrivate::sendDataChanged (this=0x9524f0) at kernel/qaction.cpp:120
#9  0x00007fd54f0dac6f in QAction::setText (this=this@entry=0x967720, text=...) at kernel/qaction.cpp:739
#10 0x00007fd550aad23b in KPopupAccelManager::setMenuEntries (this=this@entry=0x940aa0, list=...)
    at /usr/src/debug/kwidgetsaddons-4.100.0git~1403118825~baeafac/src/kacceleratormanager.cpp:776
#11 0x00007fd550aad3de in KPopupAccelManager::calculateAccelerators (this=this@entry=0x940aa0)
    at /usr/src/debug/kwidgetsaddons-4.100.0git~1403118825~baeafac/src/kacceleratormanager.cpp:735
#12 0x00007fd550aad722 in KPopupAccelManager::aboutToShow (this=0x940aa0)
    at /usr/src/debug/kwidgetsaddons-4.100.0git~1403118825~baeafac/src/kacceleratormanager.cpp:716
#13 0x00007fd550aad89b in KPopupAccelManager::KPopupAccelManager (this=0x940aa0, popup=0x810ff0)
    at /usr/src/debug/kwidgetsaddons-4.100.0git~1403118825~baeafac/src/kacceleratormanager.cpp:703
#14 0x00007fd550aad955 in KPopupAccelManager::manage (popup=0x810ff0) at /usr/src/debug/kwidgetsaddons-4.100.0git~1403118825~baeafac/src/kacceleratormanager.cpp:786
#15 0x00007fd550ab0f3c in KAcceleratorManagerPrivate::manage (widget=widget@entry=0x810ff0)
    at /usr/src/debug/kwidgetsaddons-4.100.0git~1403118825~baeafac/src/kacceleratormanager.cpp:104
#16 0x00007fd550ab1111 in KAcceleratorManager::manage (widget=widget@entry=0x810ff0, programmers_mode=programmers_mode@entry=false)
    at /usr/src/debug/kwidgetsaddons-4.100.0git~1403118825~baeafac/src/kacceleratormanager.cpp:435
#17 0x00007fd55080ce83 in KCheckAccelerators::checkAccelerators (this=this@entry=0x742150, automatic=<optimized out>)
    at /usr/src/debug/kxmlgui-4.100.0git~1403858027~b23ea08/src/kcheckaccelerators.cpp:258
---Type <return> to continue, or q <return> to quit---
#18 0x00007fd55080debe in KCheckAccelerators::autoCheckSlot (this=0x742150) at /usr/src/debug/kxmlgui-4.100.0git~1403858027~b23ea08/src/kcheckaccelerators.cpp:208
#19 0x00007fd54e46f01e in QMetaObject::activate (sender=sender@entry=0x742170, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, 
    argv=argv@entry=0x0) at kernel/qobject.cpp:3680
#20 0x00007fd54e46f4d7 in QMetaObject::activate (sender=sender@entry=0x742170, m=m@entry=0x7fd54e880900 <QTimer::staticMetaObject>, 
    local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3546
#21 0x00007fd54e4ec410 in QTimer::timeout (this=this@entry=0x742170) at .moc/moc_qtimer.cpp:191
#22 0x00007fd54e47c022 in QTimer::timerEvent (this=0x742170, e=<optimized out>) at kernel/qtimer.cpp:255
#23 0x00007fd54e46faac in QObject::event (this=0x742170, e=<optimized out>) at kernel/qobject.cpp:1222
#24 0x00007fd54f0dff3c in QApplicationPrivate::notify_helper (this=this@entry=0x6f9a30, receiver=receiver@entry=0x742170, e=e@entry=0x7fffddbdead0)
    at kernel/qapplication.cpp:3522
#25 0x00007fd54f0e4fc6 in QApplication::notify (this=0x7fffddbdee00, receiver=0x742170, e=0x7fffddbdead0) at kernel/qapplication.cpp:3305
#26 0x00007fd54e4400d5 in QCoreApplication::notifyInternal (this=0x7fffddbdee00, receiver=0x742170, event=0x7fffddbdead0) at kernel/qcoreapplication.cpp:935
#27 0x00007fd54e4967cd in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../src/corelib/kernel/qcoreapplication.h:237
#28 QTimerInfoList::activateTimers (this=0x7465a0) at kernel/qtimerinfo_unix.cpp:643
#29 0x00007fd54e496af1 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:185
#30 0x00007fd54a85bc54 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#31 0x00007fd54a85be98 in ?? () from /usr/lib64/libglib-2.0.so.0
#32 0x00007fd54a85bf3c in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#33 0x00007fd54e496dbc in QEventDispatcherGlib::processEvents (this=0x6fef70, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#34 0x00007fd54e43dfeb in QEventLoop::exec (this=this@entry=0x7fffddbded10, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#35 0x00007fd54e445646 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#36 0x00007fd54e96cdbc in QGuiApplication::exec () at kernel/qguiapplication.cpp:1450
#37 0x00007fd54f0de665 in QApplication::exec () at kernel/qapplication.cpp:2767
#38 0x00007fd5527bb518 in kdemain (argc=1, argv=<optimized out>) at /usr/src/debug/plasma-workspace-4.97.0git~1403881135~a03b006/klipper/main.cpp:93
#39 0x00007fd5523fdb05 in __libc_start_main () from /lib64/libc.so.6
#40 0x000000000040080e in _start () at ../sysdeps/x86_64/start.S:122