look to "steps to reproduce"

Reproducible: Always

Steps to Reproduce:
Crash repeats everytime when I turn on my notebook (acer v3-371). I turn on machine - have normal boot - loading blank desktop - then i run any application by alt+F2 (usualy Network Manager) - then kde give me message about it crashes - KDE restars like Explorer in Win - resuming normal work. (sorry if bad English)

Actual Results:  
blank screen

Expected Results:  
nomal work

Application: plasma-desktop (4.11.11)
KDE Platform Version: 4.13.3
Qt Version: 4.8.6
Operating System: Linux 3.13.0-49-generic x86_64
Distribution: Ubuntu 14.04.2 LTS

-- Information about the crash:
- What I was doing when the application crashed:
Update from 12.04 to 14.04

- Unusual behavior I noticed:
Crash repeats everytime when I turn on my notebook (acer v3-371). I turn on machine - have normal boot - loading blank desktop - then i run any application by alt+F2 (usualy Network Manager) - then kde give me message about it crashes - KDE restars like Explorer in Win - resuming normal work. (sorry if bad English)

- Custom settings of the application: 
none

The crash can be reproduced every time.

-- Backtrace:
Application: Оболочка Plasma (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fe6d51717c0 (LWP 2088))]

Thread 8 (Thread 0x7fe6aad13700 (LWP 2090)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fe6cf9d981d in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007fe6cf9d9859 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007fe6c86c2182 in start_thread (arg=0x7fe6aad13700) at pthread_create.c:312
#4  0x00007fe6d4a6347d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 7 (Thread 0x7fe66900a700 (LWP 2092)):
#0  0x00007fe6d4a5612d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fe6c7fb0fe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe6c7fb130a in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe669b06336 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fe6c7fd5f05 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fe6c86c2182 in start_thread (arg=0x7fe66900a700) at pthread_create.c:312
#6  0x00007fe6d4a6347d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 6 (Thread 0x7fe663fff700 (LWP 2093)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fe6cde16ffb in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007fe6cde17039 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007fe6c86c2182 in start_thread (arg=0x7fe663fff700) at pthread_create.c:312
#4  0x00007fe6d4a6347d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 5 (Thread 0x7fe5d9bad700 (LWP 2097)):
#0  0x00007fe6d4a71084 in pthread_mutex_unlock (mutex=0x7fe5d4000a60) at forward.c:194
#1  0x00007fe6c7ff29b1 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe6c7fb08f9 in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe6c7fb0f52 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fe6c7fb10ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fe6d162c7be in QEventDispatcherGlib::processEvents (this=0x7fe5d40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#6  0x00007fe6d15fe0af in QEventLoop::processEvents (this=this@entry=0x7fe5d9bacde0, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007fe6d15fe3a5 in QEventLoop::exec (this=this@entry=0x7fe5d9bacde0, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007fe6d14fac5f in QThread::exec (this=this@entry=0x1cc6f40) at thread/qthread.cpp:537
#9  0x00007fe6d15df823 in QInotifyFileSystemWatcherEngine::run (this=0x1cc6f40) at io/qfilesystemwatcher_inotify.cpp:265
#10 0x00007fe6d14fd32f in QThreadPrivate::start (arg=0x1cc6f40) at thread/qthread_unix.cpp:349
#11 0x00007fe6c86c2182 in start_thread (arg=0x7fe5d9bad700) at pthread_create.c:312
#12 0x00007fe6d4a6347d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 4 (Thread 0x7fe5d3559700 (LWP 2098)):
#0  0x00007fe6d162dea5 in QTimerInfoList::repairTimersIfNeeded (this=0x7fe5cc003130) at kernel/qeventdispatcher_unix.cpp:412
#1  0x00007fe6d162df1b in QTimerInfoList::timerWait (this=0x7fe5cc003130, tm=...) at kernel/qeventdispatcher_unix.cpp:461
#2  0x00007fe6d162c67c in timerSourcePrepareHelper (src=<optimized out>, timeout=0x7fe5d3558c64) at kernel/qeventdispatcher_glib.cpp:143
#3  0x00007fe6d162c725 in timerSourcePrepare (source=<optimized out>, timeout=<optimized out>) at kernel/qeventdispatcher_glib.cpp:176
#4  0x00007fe6c7fb068d in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fe6c7fb0f03 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fe6c7fb10ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007fe6d162c7be in QEventDispatcherGlib::processEvents (this=0x7fe5cc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#8  0x00007fe6d15fe0af in QEventLoop::processEvents (this=this@entry=0x7fe5d3558e20, flags=...) at kernel/qeventloop.cpp:149
#9  0x00007fe6d15fe3a5 in QEventLoop::exec (this=this@entry=0x7fe5d3558e20, flags=...) at kernel/qeventloop.cpp:204
#10 0x00007fe6d14fac5f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:537
#11 0x00007fe6d14fd32f in QThreadPrivate::start (arg=0x28e2180) at thread/qthread_unix.cpp:349
#12 0x00007fe6c86c2182 in start_thread (arg=0x7fe5d3559700) at pthread_create.c:312
#13 0x00007fe6d4a6347d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7fe6b1c5d700 (LWP 2108)):
#0  0x00007fe6c7ff2998 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fe6c7fb0a6c in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe6c7fb0f7b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe6c7fb10ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fe6d162c7be in QEventDispatcherGlib::processEvents (this=0x7fe5b40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#5  0x00007fe6d15fe0af in QEventLoop::processEvents (this=this@entry=0x7fe6b1c5cde0, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007fe6d15fe3a5 in QEventLoop::exec (this=this@entry=0x7fe6b1c5cde0, flags=...) at kernel/qeventloop.cpp:204
#7  0x00007fe6d14fac5f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:537
#8  0x00007fe5c21b6027 in KCupsConnection::run() () from /usr/lib/libkcupslib.so
#9  0x00007fe6d14fd32f in QThreadPrivate::start (arg=0x3acc080) at thread/qthread_unix.cpp:349
#10 0x00007fe6c86c2182 in start_thread (arg=0x7fe6b1c5d700) at pthread_create.c:312
#11 0x00007fe6d4a6347d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7fe5d18a0700 (LWP 2463)):
#0  0x00007fe6c7fae407 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fe6c7fb062b in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe6c7fb0f03 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe6c7fb10ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fe6d162c7be in QEventDispatcherGlib::processEvents (this=0x7fe5c8003220, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#5  0x00007fe6d15fe0af in QEventLoop::processEvents (this=this@entry=0x7fe5d189fe20, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007fe6d15fe3a5 in QEventLoop::exec (this=this@entry=0x7fe5d189fe20, flags=...) at kernel/qeventloop.cpp:204
#7  0x00007fe6d14fac5f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:537
#8  0x00007fe6d14fd32f in QThreadPrivate::start (arg=0x4450f40) at thread/qthread_unix.cpp:349
#9  0x00007fe6c86c2182 in start_thread (arg=0x7fe5d18a0700) at pthread_create.c:312
#10 0x00007fe6d4a6347d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7fe6d51717c0 (LWP 2088)):
[KCrash Handler]
#6  0x0000000001c75310 in ?? ()
#7  0x00007fe5d356facc in RTM::Auth::getAuthUrl (this=this@entry=0x2965730) at ../../../libs/rtm/auth.cpp:82
#8  0x00007fe5d35620be in RTM::Session::handleValidToken (this=0x2965510, valid=<optimized out>) at ../../../libs/rtm/session.cpp:131
#9  0x00007fe5d35651ce in RTM::Session::qt_static_metacall (_o=0x7ffef4e1dbb0, _id=43407152, _a=0x437fd30, _c=<optimized out>) at ./moc_session.cpp:113
#10 0x00007fe6d161387a in QMetaObject::activate (sender=sender@entry=0x2965510, m=m@entry=0x7fe5d377a9e0 <RTM::Session::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7ffef4e1de00) at kernel/qobject.cpp:3539
#11 0x00007fe5d35626a2 in RTM::Session::tokenCheck (this=this@entry=0x2965510, _t1=_t1@entry=false) at ./moc_session.cpp:184
#12 0x00007fe5d35626d6 in RTM::Session::checkToken (this=0x2965510) at ../../../libs/rtm/session.cpp:152
#13 0x00007fe5d3563bae in RTM::Session::Session (this=0x2965510, apiKey=..., sharedSecret=..., permissions=RTM::Delete, token=..., parent=<optimized out>) at ../../../libs/rtm/session.cpp:53
#14 0x00007fe5d378396c in RtmEngine::RtmEngine (this=0x28996c0, parent=<optimized out>, args=...) at ../../../dataengines/rememberthemilk/rtmengine.cpp:51
#15 0x00007fe5d37843d8 in KPluginFactory::createInstance<RtmEngine, QObject> (parentWidget=<optimized out>, parent=<optimized out>, args=...) at /usr/include/kpluginfactory.h:477
#16 0x00007fe6d1de0433 in KPluginFactory::create (this=0x288e370, iface=0x7fe6d46dc320 <qt_meta_stringdata_Plasma__DataEngine> "Plasma::DataEngine", parentWidget=0x0, parent=0x0, args=..., keyword=...) at ../../kdecore/util/kpluginfactory.cpp:203
#17 0x00007fe6d45997d9 in create<Plasma::DataEngine> (args=..., keyword=..., parent=0x0, parentWidget=0x0, this=0x288e370) at ../../kdecore/util/kpluginfactory.h:531
#18 createInstance<Plasma::DataEngine> (error=0x7ffef4e1e080, args=..., parent=0x0, parentWidget=0x0, this=0x295f660) at ../../kdecore/services/kservice.h:573
#19 createInstance<Plasma::DataEngine> (error=0x7ffef4e1e080, args=..., parent=0x0, this=0x295f660) at ../../kdecore/services/kservice.h:550
#20 Plasma::PluginLoader::loadDataEngine (this=<optimized out>, name=...) at ../../plasma/pluginloader.cpp:184
#21 0x00007fe6d4583680 in Plasma::DataEngineManager::loadEngine (this=0x1ebc950, name=...) at ../../plasma/dataenginemanager.cpp:132
#22 0x00007fe6d45b49fb in Plasma::DataEngineConsumer::dataEngine (this=0x21bba00, name=...) at ../../plasma/private/dataengineconsumer.cpp:105
#23 0x00007fe6d454c00c in Plasma::Applet::dataEngine (this=this@entry=0x21bb570, name=...) at ../../plasma/applet.cpp:685
#24 0x00007fe6aad25886 in RememberTheMilkPlasmoid::graphicsWidget (this=0x21bb570) at ../../../applets/rememberthemilk/rememberthemilk-plasmoid.cpp:317
#25 0x00007fe6aad261e4 in RememberTheMilkPlasmoid::init (this=0x21bb570) at ../../../applets/rememberthemilk/rememberthemilk-plasmoid.cpp:88
#26 0x00007fe6d456f33c in Plasma::ContainmentPrivate::initApplets (this=0x1f53310) at ../../plasma/containment.cpp:460
#27 0x00007fe6d457c20c in Plasma::CoronaPrivate::importLayout (this=0x1da7890, conf=..., mergeConfig=mergeConfig@entry=false) at ../../plasma/corona.cpp:1070
#28 0x00007fe6d457cc0a in Plasma::Corona::loadLayout (this=this@entry=0x1c1f710, configName=...) at ../../plasma/corona.cpp:281
#29 0x00007fe6d457ccc4 in Plasma::Corona::initializeLayout (this=this@entry=0x1c1f710, configName=...) at ../../plasma/corona.cpp:182
#30 0x00007fe6d4d7f33a in PlasmaApp::corona (this=this@entry=0x1c49480, createIfMissing=createIfMissing@entry=true) at ../../../../plasma/desktop/shell/plasmaapp.cpp:856
#31 0x00007fe6d4d7f945 in PlasmaApp::setupDesktop (this=0x1c49480) at ../../../../plasma/desktop/shell/plasmaapp.cpp:314
#32 0x00007fe6d4d83ca5 in PlasmaApp::qt_static_metacall (_o=0x1c49480, _id=43407152, _a=0x437fd30, _c=<optimized out>) at ./plasmaapp.moc:128
#33 0x00007fe6d1617c1e in QObject::event (this=this@entry=0x1c49480, e=e@entry=0x1d93f50) at kernel/qobject.cpp:1194
#34 0x00007fe6d1603cfc in QCoreApplication::event (this=this@entry=0x1c49480, e=e@entry=0x1d93f50) at kernel/qcoreapplication.cpp:1765
#35 0x00007fe6d099ded3 in QApplication::event (this=0x1c49480, e=0x1d93f50) at kernel/qapplication.cpp:2549
#36 0x00007fe6d0998e2c in QApplicationPrivate::notify_helper (this=this@entry=0x1c6f560, receiver=receiver@entry=0x1c49480, e=e@entry=0x1d93f50) at kernel/qapplication.cpp:4567
#37 0x00007fe6d099f4a0 in QApplication::notify (this=this@entry=0x1c49480, receiver=receiver@entry=0x1c49480, e=e@entry=0x1d93f50) at kernel/qapplication.cpp:4353
#38 0x00007fe6d22c4d1a in KApplication::notify (this=0x1c49480, receiver=0x1c49480, event=0x1d93f50) at ../../kdeui/kernel/kapplication.cpp:311
#39 0x00007fe6d15ff4dd in QCoreApplication::notifyInternal (this=0x1c49480, receiver=receiver@entry=0x1c49480, event=event@entry=0x1d93f50) at kernel/qcoreapplication.cpp:953
#40 0x00007fe6d1602b3d in sendEvent (event=0x1d93f50, receiver=0x1c49480) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#41 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x1bde1f0) at kernel/qcoreapplication.cpp:1577
#42 0x00007fe6d1602fe3 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1470
#43 0x00007fe6d162cf83 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#44 postEventSourceDispatch (s=0x1c70d20) at kernel/qeventdispatcher_glib.cpp:287
#45 0x00007fe6c7fb0e04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#46 0x00007fe6c7fb1048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#47 0x00007fe6c7fb10ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#48 0x00007fe6d162c7a1 in QEventDispatcherGlib::processEvents (this=0x1bdfaf0, flags=...) at kernel/qeventdispatcher_glib.cpp:434
#49 0x00007fe6d0a3abb6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#50 0x00007fe6d15fe0af in QEventLoop::processEvents (this=this@entry=0x7ffef4e1eeb0, flags=...) at kernel/qeventloop.cpp:149
#51 0x00007fe6d15fe3a5 in QEventLoop::exec (this=this@entry=0x7ffef4e1eeb0, flags=...) at kernel/qeventloop.cpp:204
#52 0x00007fe6d1603b79 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#53 0x00007fe6d099737c in QApplication::exec () at kernel/qapplication.cpp:3828
#54 0x00007fe6d4d6a67c in kdemain (argc=1, argv=0x7ffef4e1f108) at ../../../../plasma/desktop/shell/main.cpp:126
#55 0x00007fe6d498aec5 in __libc_start_main (main=0x4006e0 <main(int, char**)>, argc=1, argv=0x7ffef4e1f108, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffef4e1f0f8) at libc-start.c:287
#56 0x000000000040070e in _start ()