plasma crashes at startup... 
the backtrace I got

(gdb) bt
#0  0x00007faf4bb14a4d in nanosleep () from /lib64/libc.so.6
#1  0x00007faf4bb148e4 in sleep () from /lib64/libc.so.6
#2  0x00007faf518ffba2 in startProcessInternal (directly=false, 
    waitAndExit=true, argv=0x7fffc7d7a1f0, argc=-942169616)
    at /usr/src/debug/kcrash-5.0.0git~1404238467~6fd5c71/src/kcrash.cpp:628
#3  KCrash::startProcess (argc=argc@entry=15, argv=argv@entry=0x7fffc7d7a1f0, 
    waitAndExit=waitAndExit@entry=true)
    at /usr/src/debug/kcrash-5.0.0git~1404238467~6fd5c71/src/kcrash.cpp:594
#4  0x00007faf51900015 in KCrash::defaultCrashHandler (sig=<optimized out>)
    at /usr/src/debug/kcrash-5.0.0git~1404238467~6fd5c71/src/kcrash.cpp:505
#5  <signal handler called>
#6  data (this=0x8) at /usr/include/qt5/QtCore/qscopedpointer.h:143
#7  qGetPtrHelper<QScopedPointer<QObjectData> > (p=...)
    at /usr/include/qt5/QtCore/qglobal.h:945
#8  d_func (this=0x0) at items/qquickitem.h:445
#9  QQuickItem::stackBefore (this=0x0, sibling=sibling@entry=0x3c8a8c0)
    at items/qquickitem.cpp:2446
#10 0x00007faf5253237b in QQuickRepeater::modelUpdated (this=<optimized out>, 
    changeSet=..., reset=<optimized out>) at items/qquickrepeater.cpp:491
#11 0x00007faf525d8d50 in QQuickRepeater::qt_static_metacall (
    _o=<optimized out>, _c=<optimized out>, _id=<optimized out>, 
    _a=<optimized out>) at .moc/moc_qquickrepeater_p.cpp:136
#12 0x00007faf4c3c3b7e in QMetaObject::activate (
    sender=sender@entry=0x3b8e3a0, signalOffset=<optimized out>, 
    local_signal_index=local_signal_index@entry=1, 
    argv=argv@entry=0x7fffc7d7ac00) at kernel/qobject.cpp:3680
#13 0x00007faf4c3c4037 in QMetaObject::activate (
    sender=sender@entry=0x3b8e3a0, 
    m=m@entry=0x7faf4ee2fec0 <QQmlInstanceModel::staticMetaObject>, 
    local_signal_index=local_signal_index@entry=1, 
    argv=argv@entry=0x7fffc7d7ac00) at kernel/qobject.cpp:3546
#14 0x00007faf4eb53066 in QQmlInstanceModel::modelUpdated (
    this=this@entry=0x3b8e3a0, _t1=..., _t2=false)
    at .moc/moc_qqmlobjectmodel_p.cpp:211
#15 0x00007faf4eb23828 in QQmlDelegateModelPrivate::emitModelUpdated (
    this=<optimized out>, changeSet=..., reset=<optimized out>)
    at types/qqmldelegatemodel.cpp:1405
#16 0x00007faf4eb25593 in QQmlDelegateModelGroupPrivate::emitModelUpdated (
    this=0x3b5bd70, reset=reset@entry=false)
---Type <return> to continue, or q <return> to quit---
    at types/qqmldelegatemodel.cpp:2244
#17 0x00007faf4eb27fca in QQmlDelegateModelPrivate::emitChanges (
    this=0x3b5bb10) at types/qqmldelegatemodel.cpp:1424
#18 0x00007faf4eb2ddb3 in QQmlDelegateModel::_q_itemsMoved (
    this=<optimized out>, from=8, to=5, count=count@entry=1)
    at types/qqmldelegatemodel.cpp:1399
#19 0x00007faf4eb2df5d in QQmlDelegateModel::_q_rowsMoved (
    this=<optimized out>, sourceParent=..., sourceStart=<optimized out>, 
    sourceEnd=<optimized out>, destinationParent=..., 
    destinationRow=<optimized out>) at types/qqmldelegatemodel.cpp:1509
#20 0x00007faf4eb50830 in QQmlDelegateModel::qt_static_metacall (
    _o=_o@entry=0x3b8e3a0, _c=_c@entry=QMetaObject::InvokeMetaMethod, 
    _id=_id@entry=11, _a=_a@entry=0x7fffc7d7afa0)
    at .moc/moc_qqmldelegatemodel_p.cpp:200
#21 0x00007faf4eb50d8f in QQmlDelegateModel::qt_metacall (this=0x3b8e3a0, 
    _c=QMetaObject::InvokeMetaMethod, _id=11, _a=0x7fffc7d7afa0)
    at .moc/moc_qqmldelegatemodel_p.cpp:292
#22 0x00007faf4c3c3c2d in QMetaObject::activate (
    sender=sender@entry=0x3bb1a50, signalOffset=<optimized out>, 
    local_signal_index=local_signal_index@entry=20, 
    argv=argv@entry=0x7fffc7d7afa0) at kernel/qobject.cpp:3695
#23 0x00007faf4c3c4037 in QMetaObject::activate (
    sender=sender@entry=0x3bb1a50, 
    m=m@entry=0x7faf4c7d4ea0 <QAbstractItemModel::staticMetaObject>, 
    local_signal_index=local_signal_index@entry=20, 
    argv=argv@entry=0x7fffc7d7afa0) at kernel/qobject.cpp:3546
#24 0x00007faf4c43f0d4 in QAbstractItemModel::rowsMoved (
    this=this@entry=0x3bb1a50, _t1=..., _t2=_t2@entry=8, _t3=_t3@entry=8, 
    _t4=..., _t5=_t5@entry=5) at .moc/moc_qabstractitemmodel.cpp:495
#25 0x00007faf4c34145a in QAbstractItemModel::endMoveRows (this=0x3bb1a50)
    at itemmodels/qabstractitemmodel.cpp:2856
#26 0x00007fae9be1a30c in itemMoved (item=<optimized out>, 
    this=<optimized out>)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/libtaskmanager/tasksmodel.cpp:522
#27 TaskManager::TasksModel::qt_static_metacall (_o=<optimized out>, 
    _c=<optimized out>, _id=<optimized out>, _a=0x7fffc7d7b240)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/build/libtaskmanager/moc_tasksmodel.cpp:211
---Type <return> to continue, or q <return> to quit---
#28 0x00007faf4c3c3b7e in QMetaObject::activate (
    sender=sender@entry=0x3bc0fb0, signalOffset=<optimized out>, 
    local_signal_index=local_signal_index@entry=6, 
    argv=argv@entry=0x7fffc7d7b240) at kernel/qobject.cpp:3680
#29 0x00007faf4c3c4037 in QMetaObject::activate (
    sender=sender@entry=0x3bc0fb0, 
    m=m@entry=0x7fae9c03b880 <TaskManager::TaskGroup::staticMetaObject>, 
    local_signal_index=local_signal_index@entry=6, 
    argv=argv@entry=0x7fffc7d7b240) at kernel/qobject.cpp:3546
#30 0x00007fae9be0c5b2 in TaskManager::TaskGroup::itemPositionChanged (
    this=this@entry=0x3bc0fb0, _t1=_t1@entry=0x38982b0)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/build/libtaskmanager/moc_taskgroup.cpp:437
#31 0x00007fae9be0caec in TaskManager::TaskGroup::moveItem (this=0x3bc0fb0, 
    oldIndex=oldIndex@entry=8, newIndex=newIndex@entry=5)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/libtaskmanager/taskgroup.cpp:702
#32 0x00007fae9bdec5ac in TaskManager::AbstractSortingStrategy::check (
    this=this@entry=0x3ad9920, itemToCheck=itemToCheck@entry=0x38982b0)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/libtaskmanager/abstractsortingstrategy.cpp:147
#33 0x00007fae9bdec9c3 in TaskManager::AbstractSortingStrategy::handleItem (
    this=0x3ad9920, item=0x38982b0)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/libtaskmanager/abstractsortingstrategy.cpp:112
#34 0x00007fae9bdef75e in TaskManager::GroupManagerPrivate::addTask (
    this=this@entry=0x325a1d0, task=0x3b853a0)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/libtaskmanager/groupmanager.cpp:364
#35 0x00007fae9bdefadc in TaskManager::GroupManagerPrivate::actuallyReloadTasks
    (this=0x325a1d0)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/libtaskmanager/groupmanager.cpp:205
#36 0x00007fae9bdf3e59 in TaskManager::GroupManager::qt_static_metacall (
    _o=0x3ad1900, _c=<optimized out>, _id=<optimized out>, _a=0x7fffc7d7b550)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/build/libtaskmanager/moc_groupmanager.cpp:262
#37 0x00007faf4c3c3b7e in QMetaObject::activate (
    sender=sender@entry=0x325a230, signalOffset=<optimized out>, 
---Type <return> to continue, or q <return> to quit---
    local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0)
    at kernel/qobject.cpp:3680
#38 0x00007faf4c3c4037 in QMetaObject::activate (
    sender=sender@entry=0x325a230, 
    m=m@entry=0x7faf4c7d5900 <QTimer::staticMetaObject>, 
    local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0)
    at kernel/qobject.cpp:3546
#39 0x00007faf4c440f70 in QTimer::timeout (this=this@entry=0x325a230)
    at .moc/moc_qtimer.cpp:191
#40 0x00007faf4c3d0b82 in QTimer::timerEvent (this=0x325a230, 
    e=<optimized out>) at kernel/qtimer.cpp:255
#41 0x00007faf4c3c460c in QObject::event (this=0x325a230, e=<optimized out>)
    at kernel/qobject.cpp:1222
#42 0x00007faf4d035f3c in QApplicationPrivate::notify_helper (
    this=this@entry=0x1ac4350, receiver=receiver@entry=0x325a230, e=e@entry=
    0x7fffc7d7b980) at kernel/qapplication.cpp:3522
#43 0x00007faf4d03afc6 in QApplication::notify (this=0x7fffc7d7d810, 
    receiver=0x325a230, e=0x7fffc7d7b980) at kernel/qapplication.cpp:3305
#44 0x00007faf4c394c35 in QCoreApplication::notifyInternal (this=
    0x7fffc7d7d810, receiver=0x325a230, event=0x7fffc7d7b980)
    at kernel/qcoreapplication.cpp:935
#45 0x00007faf4c3eb32d in sendEvent (event=<optimized out>, 
    receiver=<optimized out>)
    at ../../src/corelib/kernel/qcoreapplication.h:237
#46 QTimerInfoList::activateTimers (this=0x1b0f380)
    at kernel/qtimerinfo_unix.cpp:643
#47 0x00007faf4c3eb651 in timerSourceDispatch (source=<optimized out>)
    at kernel/qeventdispatcher_glib.cpp:185
#48 0x00007faf47257c54 in g_main_dispatch (context=0x1aea800) at gmain.c:3064
#49 g_main_context_dispatch (context=context@entry=0x1aea800) at gmain.c:3663
#50 0x00007faf47257e98 in g_main_context_iterate (
    context=context@entry=0x1aea800, block=block@entry=0, 
    dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3734
#51 0x00007faf47257f3c in g_main_context_iteration (context=0x1aea800, 
    may_block=0) at gmain.c:3795
#52 0x00007faf4c3eb91c in QEventDispatcherGlib::processEvents (this=0x1ad1700, 
    flags=...) at kernel/qeventdispatcher_glib.cpp:426
#53 0x00007faf4c395042 in QCoreApplication::processEvents (flags=..., 
    maxtime=50) at kernel/qcoreapplication.cpp:1133
---Type <return> to continue, or q <return> to quit---
#54 0x00007faf50aa4451 in KDeclarative::QmlObject::completeInitialization(QHash<QString, QVariant> const&) () from /usr/lib64/libKF5Declarative.so.5
#55 0x00007faf51424bdd in PlasmaQuick::AppletQuickItem::init() ()
   from /usr/lib64/libKF5PlasmaQuick.so.5
#56 0x00007faf317a1c44 in ?? ()
   from /usr/lib64/qt5/plugins/plasma_appletscript_declarative.so
#57 0x00007faf514267e8 in PlasmaQuick::AppletQuickItem::itemChange(QQuickItem::ItemChange, QQuickItem::ItemChangeData const&) ()
   from /usr/lib64/libKF5PlasmaQuick.so.5
#58 0x00007faf524a718d in QQuickItemPrivate::refWindow (this=0x24ee980, 
    c=c@entry=0x32846d0) at items/qquickitem.cpp:2637
#59 0x00007faf524a7135 in QQuickItemPrivate::refWindow (
    this=this@entry=0x22257b0, c=c@entry=0x32846d0)
    at items/qquickitem.cpp:2630
#60 0x00007faf524a8839 in QQuickItem::setParentItem (this=0x2242930, 
    parentItem=0x2b0be10) at items/qquickitem.cpp:2376
#61 0x00007faf51430e18 in ?? () from /usr/lib64/libKF5PlasmaQuick.so.5
#62 0x000000000044b271 in ShellCorona::createWaitingPanels (this=0x1b0cae0)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/shell/shellcorona.cpp:794
#63 0x00007faf4c3c3693 in call (a=0x7fffc7d7c120, r=0x1b0cae0, this=0x1b9e0e0)
    at ../../src/corelib/kernel/qobject_impl.h:132
#64 QMetaObject::activate (sender=sender@entry=0x1bac3e0, 
    signalOffset=<optimized out>, 
    local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0)
    at kernel/qobject.cpp:3666
#65 0x00007faf4c3c4037 in QMetaObject::activate (
    sender=sender@entry=0x1bac3e0, 
    m=m@entry=0x7faf4c7d5900 <QTimer::staticMetaObject>, 
    local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0)
    at kernel/qobject.cpp:3546
#66 0x00007faf4c440f70 in QTimer::timeout (this=this@entry=0x1bac3e0)
    at .moc/moc_qtimer.cpp:191
#67 0x00007faf4c3d0b82 in QTimer::timerEvent (this=0x1bac3e0, 
    e=<optimized out>) at kernel/qtimer.cpp:255
#68 0x00007faf4c3c460c in QObject::event (this=0x1bac3e0, e=<optimized out>)
    at kernel/qobject.cpp:1222
#69 0x00007faf4d035f3c in QApplicationPrivate::notify_helper (
    this=this@entry=0x1ac4350, receiver=receiver@entry=0x1bac3e0, 
---Type <return> to continue, or q <return> to quit---
    e=e@entry=0x7fffc7d7c550) at kernel/qapplication.cpp:3522
#70 0x00007faf4d03afc6 in QApplication::notify (this=0x7fffc7d7d810, 
    receiver=0x1bac3e0, e=0x7fffc7d7c550) at kernel/qapplication.cpp:3305
#71 0x00007faf4c394c35 in QCoreApplication::notifyInternal (
    this=0x7fffc7d7d810, receiver=0x1bac3e0, event=0x7fffc7d7c550)
    at kernel/qcoreapplication.cpp:935
#72 0x00007faf4c3eb32d in sendEvent (event=<optimized out>, 
    receiver=<optimized out>)
    at ../../src/corelib/kernel/qcoreapplication.h:237
#73 QTimerInfoList::activateTimers (this=0x1b0f380)
    at kernel/qtimerinfo_unix.cpp:643
#74 0x00007faf4c3eb651 in timerSourceDispatch (source=<optimized out>)
    at kernel/qeventdispatcher_glib.cpp:185
#75 0x00007faf47257c54 in g_main_dispatch (context=0x1aea800) at gmain.c:3064
#76 g_main_context_dispatch (context=context@entry=0x1aea800) at gmain.c:3663
#77 0x00007faf47257e98 in g_main_context_iterate (
    context=context@entry=0x1aea800, block=block@entry=0, 
    dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3734
#78 0x00007faf47257f3c in g_main_context_iteration (context=0x1aea800, 
    may_block=0) at gmain.c:3795
#79 0x00007faf4c3eb91c in QEventDispatcherGlib::processEvents (this=0x1ad1700, 
    flags=...) at kernel/qeventdispatcher_glib.cpp:426
#80 0x00007faf4c395042 in QCoreApplication::processEvents (flags=..., 
    maxtime=50) at kernel/qcoreapplication.cpp:1133
#81 0x00007faf50aa4888 in KDeclarative::QmlObject::createObjectFromComponent(QQmlComponent*, QQmlContext*, QHash<QString, QVariant> const&) ()
   from /usr/lib64/libKF5Declarative.so.5
#82 0x00007faf317a6d44 in ?? ()
   from /usr/lib64/qt5/plugins/plasma_appletscript_declarative.so
#83 0x00007faf514267e8 in PlasmaQuick::AppletQuickItem::itemChange(QQuickItem::ItemChange, QQuickItem::ItemChangeData const&) ()
   from /usr/lib64/libKF5PlasmaQuick.so.5
#84 0x00007faf524a718d in QQuickItemPrivate::refWindow (
    this=this@entry=0x27dcd60, c=c@entry=0x2d81840)
    at items/qquickitem.cpp:2637
#85 0x00007faf524a8839 in QQuickItem::setParentItem (this=0x27c2d40, 
    parentItem=0x3001720) at items/qquickitem.cpp:2376
#86 0x00007faf51430e18 in ?? () from /usr/lib64/libKF5PlasmaQuick.so.5
#87 0x00000000004503ac in ShellCorona::addOutput (this=this@entry=0x1b0cae0, 
---Type <return> to continue, or q <return> to quit---
    output=0x1ab8190)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/shell/shellcorona.cpp:688
#88 0x00000000004514a7 in ShellCorona::load (this=0x1b0cae0)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/shell/shellcorona.cpp:321
#89 0x00000000004519de in ShellCorona::setShell (this=0x1b0cae0, shell=...)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/shell/shellcorona.cpp:258
#90 0x00007faf4c3c3693 in call (a=0x7fffc7d7cf10, r=0x1b0cae0, this=0x1bac260)
    at ../../src/corelib/kernel/qobject_impl.h:132
#91 QMetaObject::activate (sender=sender@entry=0x1bac4c0, 
    signalOffset=<optimized out>, 
    local_signal_index=local_signal_index@entry=0, 
    argv=argv@entry=0x7fffc7d7cf10) at kernel/qobject.cpp:3666
#92 0x00007faf4c3c4037 in QMetaObject::activate (
    sender=sender@entry=0x1bac4c0, 
    m=m@entry=0x693720 <ShellManager::staticMetaObject>, 
    local_signal_index=local_signal_index@entry=0, 
    argv=argv@entry=0x7fffc7d7cf10) at kernel/qobject.cpp:3546
#93 0x0000000000476cd2 in ShellManager::shellChanged (
    this=this@entry=0x1bac4c0, _t1=...)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/build/shell/moc_shellmanager.cpp:155
#94 0x0000000000457514 in ShellManager::updateShell (this=this@entry=0x1bac4c0)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/shell/shellmanager.cpp:231
#95 0x0000000000458649 in ShellManager::loadHandlers (this=0x1bac4c0)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/shell/shellmanager.cpp:129
#96 0x00000000004770bd in ShellManager::qt_static_metacall (
    _o=<optimized out>, _c=<optimized out>, _id=<optimized out>, 
    _a=<optimized out>)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/build/shell/moc_shellmanager.cpp:99
#97 0x00007faf4c3c4816 in QObject::event (this=0x1bac4c0, e=<optimized out>)
    at kernel/qobject.cpp:1241
#98 0x00007faf4d035f3c in QApplicationPrivate::notify_helper (
    this=this@entry=0x1ac4350, receiver=receiver@entry=0x1bac4c0, 
---Type <return> to continue, or q <return> to quit---
    e=e@entry=0x1b7e650) at kernel/qapplication.cpp:3522
#99 0x00007faf4d03afc6 in QApplication::notify (this=0x7fffc7d7d810, 
    receiver=0x1bac4c0, e=0x1b7e650) at kernel/qapplication.cpp:3305
#100 0x00007faf4c394c35 in QCoreApplication::notifyInternal (
    this=0x7fffc7d7d810, receiver=0x1bac4c0, event=event@entry=0x1b7e650)
    at kernel/qcoreapplication.cpp:935
#101 0x00007faf4c396a87 in sendEvent (event=0x1b7e650, 
    receiver=<optimized out>) at kernel/qcoreapplication.h:237
#102 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, 
    event_type=event_type@entry=0, data=0x1ab76a0)
    at kernel/qcoreapplication.cpp:1539
#103 0x00007faf4c3970b8 in QCoreApplication::sendPostedEvents (
    receiver=receiver@entry=0x0, event_type=event_type@entry=0)
    at kernel/qcoreapplication.cpp:1397
#104 0x00007faf4c3ec4a3 in postEventSourceDispatch (s=0x1b0c260)
    at kernel/qeventdispatcher_glib.cpp:279
#105 0x00007faf47257c54 in g_main_dispatch (context=0x1aea800) at gmain.c:3064
#106 g_main_context_dispatch (context=context@entry=0x1aea800) at gmain.c:3663
#107 0x00007faf47257e98 in g_main_context_iterate (
    context=context@entry=0x1aea800, block=block@entry=1, 
    dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3734
#108 0x00007faf47257f3c in g_main_context_iteration (context=0x1aea800, 
    may_block=1) at gmain.c:3795
#109 0x00007faf4c3eb91c in QEventDispatcherGlib::processEvents (
    this=0x1ad1700, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#110 0x00007faf4c392b4b in QEventLoop::exec (this=this@entry=0x7fffc7d7d6c0, 
    flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#111 0x00007faf4c39a1a6 in QCoreApplication::exec ()
    at kernel/qcoreapplication.cpp:1188
#112 0x00007faf4c8c1c3c in QGuiApplication::exec ()
    at kernel/qguiapplication.cpp:1456
#113 0x00007faf4d034665 in QApplication::exec ()
    at kernel/qapplication.cpp:2767
#114 0x0000000000432e80 in main (argc=3, argv=<optimized out>)
    at /usr/src/debug/plasma-workspace-4.97.0git~1404493815~aca5023/shell/main.cpp:109


Reproducible: Always