it happend frequently.
i did not open or change any value.
it will crash suddenly, and restart.
it start happened when i upgrade to 4.10 beta version.




Reproducible: Sometimes




Application: Plasma 桌面 shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f68690157c0 (LWP 2709))]

Thread 3 (Thread 0x7f68416b7700 (LWP 2735)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f686253fcd7 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f686253fd09 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f6859e243a4 in ?? () from /usr/lib/nvidia-310/libGL.so.1
#4  0x00007f685cbede9a in start_thread (arg=0x7f68416b7700) at pthread_create.c:308
#5  0x00007f68688fbcbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f683ebd4700 (LWP 2738)):
#0  0x00007f68688f0303 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f685c4eed84 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f685c4eeea4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f68654e8c46 in QEventDispatcherGlib::processEvents (this=0x7f68300008f0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007f68654b92ef in QEventLoop::processEvents (this=this@entry=0x7f683ebd3cd0, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f68654b9578 in QEventLoop::exec (this=0x7f683ebd3cd0, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f68653bab40 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#7  0x00007f68654999df in QInotifyFileSystemWatcherEngine::run (this=0x38676a0) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f68653bdb1c in QThreadPrivate::start (arg=0x38676a0) at thread/qthread_unix.cpp:338
#9  0x00007f6859e243a4 in ?? () from /usr/lib/nvidia-310/libGL.so.1
#10 0x00007f685cbede9a in start_thread (arg=0x7f683ebd4700) at pthread_create.c:308
#11 0x00007f68688fbcbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f68690157c0 (LWP 2709)):
[KCrash Handler]
#6  0x00007f68654cec6e in QMetaObject::addGuard (ptr=0x7fffd380e520) at kernel/qobject.cpp:401
#7  0x00007f68670cae0e in QPointer (p=..., this=0x7fffd380e520) at ../../include/QtCore/../../src/corelib/kernel/qpointer.h:62
#8  takeAt (i=11, this=0x486c668) at ../../include/QtCore/../../src/corelib/tools/qlist.h:486
#9  QDeclarativeRepeater::itemsRemoved (this=0x486c3b0, index=11, count=<optimized out>) at graphicsitems/qdeclarativerepeater.cpp:407
#10 0x00007f68654cff8f in QMetaObject::activate (sender=0x486cc80, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fffd380e6a0) at kernel/qobject.cpp:3547
#11 0x00007f686720fe6f in QDeclarativeVisualModel::itemsRemoved (this=<optimized out>, _t1=11, _t2=1) at .moc/release-shared/moc_qdeclarativevisualitemmodel_p.cpp:161
#12 0x00007f68670e1d6c in QDeclarativeVisualDataModel::_q_itemsRemoved (this=0x486cc80, index=11, count=1) at graphicsitems/qdeclarativevisualitemmodel.cpp:1314
#13 0x00007f68672104a1 in QDeclarativeVisualDataModel::qt_static_metacall (_o=0x7fffd380e520, _c=11, _id=38364800, _a=0x1) at .moc/release-shared/moc_qdeclarativevisualitemmodel_p.cpp:401
#14 0x00007f68654cff8f in QMetaObject::activate (sender=0x407f370, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fffd380e8e0) at kernel/qobject.cpp:3547
#15 0x00007f68672048ff in QListModelInterface::itemsRemoved (this=<optimized out>, _t1=11, _t2=1) at .moc/release-shared/moc_qlistmodelinterface_p.cpp:114
#16 0x00007f686704d37f in QDeclarativeListModel::remove (this=0x407f370, index=11) at util/qdeclarativelistmodel.cpp:402
#17 0x00007f68672034cb in QDeclarativeListModel::qt_static_metacall (_o=0x7fffd380e520, _o@entry=0x407f370, _c=11, _c@entry=QMetaObject::InvokeMetaMethod, _id=38364800, _id@entry=2, _a=0x1, _a@entry=0x7fffd380eb70) at .moc/release-shared/moc_qdeclarativelistmodel_p.cpp:76
#18 0x00007f68672035cf in QDeclarativeListModel::qt_metacall (this=0x407f370, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0x7fffd380eb70) at .moc/release-shared/moc_qdeclarativelistmodel_p.cpp:123
#19 0x00007f68671ae018 in QDeclarativeObjectMethodScriptClass::callMethod (this=this@entry=0x390f400, object=object@entry=0x407f370, index=10, returnType=<optimized out>, argCount=<optimized out>, argTypes=0x7fffd380ee30, ctxt=ctxt@entry=0x7f683dfd42a8) at qml/qdeclarativeobjectscriptclass.cpp:970
#20 0x00007f68671afc86 in QDeclarativeObjectMethodScriptClass::callPrecise (this=0x390f400, object=0x407f370, data=..., ctxt=0x7f683dfd42a8) at qml/qdeclarativeobjectscriptclass.cpp:944
#21 0x00007f68671b05bb in QDeclarativeObjectMethodScriptClass::call (this=<optimized out>, o=<optimized out>, ctxt=<optimized out>) at qml/qdeclarativeobjectscriptclass.cpp:917
#22 0x00007f68625b60b3 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#23 0x00007f68624b21d0 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#24 0x00007f686248f2c6 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#25 0x00007f6848896738 in ?? ()
#26 0x7fffffff00000001 in ?? ()
#27 0x00007f683dfafb80 in ?? ()
#28 0x00007f680000000b in ?? ()
#29 0x0000000000000002 in ?? ()
#30 0x00007f6848eb9790 in ?? ()
#31 0x00007f6848e8fa80 in ?? ()
#32 0x00007f6840e7ca50 in ?? ()
#33 0x00007f6849204c80 in ?? ()
#34 0x00007f68491e7480 in ?? ()
#35 0x00007f6848896500 in ?? ()
#36 0x00007f6840e7ca68 in ?? ()
#37 0x00007f683dfd42a8 in ?? ()
#38 0x00007f6840dbe288 in ?? ()
#39 0x00007f6862838d98 in __bss_start () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#40 0x00007f6840dbd000 in ?? ()
#41 0x00007f683dfd4208 in ?? ()
#42 0x00007f683c031700 in ?? ()
#43 0x00007f6862838d98 in __bss_start () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#44 0x00007f683dfd4208 in ?? ()
#45 0x00007f683dfd4250 in ?? ()
#46 0x00007f6840e7ca50 in ?? ()
#47 0x00007f686244d8d9 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#48 0x00007f68624de817 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#49 0x00007f68624b21ff in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#50 0x00007f686259999e in QScriptValue::call(QScriptValue const&, QList<QScriptValue> const&) () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#51 0x00007f686711af35 in QDeclarativeQtScriptExpression::eval (this=this@entry=0x6b9bf18, secondaryScope=<optimized out>, isUndefined=0x0) at qml/qdeclarativeexpression.cpp:518
#52 0x00007f686711b2b1 in QDeclarativeQtScriptExpression::scriptValue (this=this@entry=0x6b9bf18, secondaryScope=secondaryScope@entry=0x0, isUndefined=isUndefined@entry=0x0) at qml/qdeclarativeexpression.cpp:470
#53 0x00007f686711b5be in QDeclarativeExpressionPrivate::scriptValue (this=this@entry=0x6b9be90, secondaryScope=secondaryScope@entry=0x0, isUndefined=isUndefined@entry=0x0) at qml/qdeclarativeexpression.cpp:653
#54 0x00007f686711b752 in QDeclarativeExpressionPrivate::value (this=0x6b9be90, secondaryScope=0x0, isUndefined=0x0) at qml/qdeclarativeexpression.cpp:667
#55 0x00007f6867152d33 in QDeclarativeBoundSignal::qt_metacall (this=0x4d75530, c=<optimized out>, id=<optimized out>, a=0x7fffd380f5d0) at qml/qdeclarativeboundsignal.cpp:196
#56 0x00007f68654d0153 in QMetaObject::activate (sender=0x6c5ed00, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3566
#57 0x00007f68670571ad in QDeclarativeTimer::finished (this=0x6c5ed00) at util/qdeclarativetimer.cpp:318
#58 0x00007f68654cff8f in QMetaObject::activate (sender=0x6c5ee40, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3547
#59 0x00007f68653a1b88 in QAbstractAnimationPrivate::setState (this=0x6bf7fe0, newState=newState@entry=QAbstractAnimation::Stopped) at animation/qabstractanimation.cpp:604
#60 0x00007f68653a1c97 in QAbstractAnimation::stop (this=this@entry=0x6c5ee40) at animation/qabstractanimation.cpp:958
#61 0x00007f68653a1de3 in QAbstractAnimation::setCurrentTime (this=this@entry=0x6c5ee40, msecs=<optimized out>) at animation/qabstractanimation.cpp:912
#62 0x00007f68653a1fa4 in updateAnimationsTime (this=0x288d3b0) at animation/qabstractanimation.cpp:235
#63 QUnifiedTimer::updateAnimationsTime (this=0x288d3b0) at animation/qabstractanimation.cpp:207
#64 0x00007f68653a1a9a in QAbstractAnimationPrivate::setState (this=0x6e68860, newState=QAbstractAnimation::Running) at animation/qabstractanimation.cpp:588
#65 0x00007f6867056e48 in QDeclarativeTimer::update (this=0x6a22dd0) at util/qdeclarativetimer.cpp:279
#66 0x00007f6867125663 in QDeclarativeComponentPrivate::complete (enginePriv=0x386d410, state=0x486cb68) at qml/qdeclarativecomponent.cpp:962
#67 0x00007f6867125c9b in completeCreate (this=<optimized out>) at qml/qdeclarativecomponent.cpp:1043
#68 QDeclarativeComponentPrivate::completeCreate (this=<optimized out>) at qml/qdeclarativecomponent.cpp:1039
#69 0x00007f68670e2928 in QDeclarativeVisualDataModel::item (this=0x486cc80, index=0, viewId=..., complete=complete@entry=true) at graphicsitems/qdeclarativevisualitemmodel.cpp:1069
#70 0x00007f68670e2ecb in QDeclarativeVisualDataModel::item (this=<optimized out>, index=0, complete=<optimized out>) at graphicsitems/qdeclarativevisualitemmodel.cpp:958
#71 0x00007f68670cac04 in QDeclarativeRepeater::itemsInserted (this=0x486c3b0, index=<optimized out>, count=<optimized out>) at graphicsitems/qdeclarativerepeater.cpp:386
#72 0x00007f68654cff8f in QMetaObject::activate (sender=0x486cc80, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fffd380fd80) at kernel/qobject.cpp:3547
#73 0x00007f686720fe1f in QDeclarativeVisualModel::itemsInserted (this=<optimized out>, _t1=0, _t2=1) at .moc/release-shared/moc_qdeclarativevisualitemmodel_p.cpp:154
#74 0x00007f68670e180c in QDeclarativeVisualDataModel::_q_itemsInserted (this=0x486cc80, index=0, count=1) at graphicsitems/qdeclarativevisualitemmodel.cpp:1282
#75 0x00007f6867210481 in QDeclarativeVisualDataModel::qt_static_metacall (_o=0x7fffd380e520, _c=11, _id=38364800, _a=0x1) at .moc/release-shared/moc_qdeclarativevisualitemmodel_p.cpp:400
#76 0x00007f68654cff8f in QMetaObject::activate (sender=0x407f370, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fffd380ffb0) at kernel/qobject.cpp:3547
#77 0x00007f68672048ac in QListModelInterface::itemsInserted (this=<optimized out>, _t1=0, _t2=1) at .moc/release-shared/moc_qlistmodelinterface_p.cpp:107
#78 0x00007f686704bffb in QDeclarativeListModel::insert (this=0x407f370, index=0, valuemap=...) at util/qdeclarativelistmodel.cpp:436
#79 0x00007f686720349f in QDeclarativeListModel::qt_static_metacall (_o=0x7fffd380e520, _o@entry=0x407f370, _c=11, _c@entry=QMetaObject::InvokeMetaMethod, _id=38364800, _id@entry=4, _a=0x1, _a@entry=0x7fffd3810250) at .moc/release-shared/moc_qdeclarativelistmodel_p.cpp:78
#80 0x00007f68672035cf in QDeclarativeListModel::qt_metacall (this=0x407f370, _c=QMetaObject::InvokeMetaMethod, _id=4, _a=0x7fffd3810250) at .moc/release-shared/moc_qdeclarativelistmodel_p.cpp:123
#81 0x00007f68671ae018 in QDeclarativeObjectMethodScriptClass::callMethod (this=this@entry=0x390f400, object=object@entry=0x407f370, index=12, returnType=<optimized out>, argCount=<optimized out>, argTypes=0x7fffd3810510, ctxt=ctxt@entry=0x7f683dfd4208) at qml/qdeclarativeobjectscriptclass.cpp:970
#82 0x00007f68671afc86 in QDeclarativeObjectMethodScriptClass::callPrecise (this=0x390f400, object=0x407f370, data=..., ctxt=0x7f683dfd4208) at qml/qdeclarativeobjectscriptclass.cpp:944
#83 0x00007f68671b05bb in QDeclarativeObjectMethodScriptClass::call (this=<optimized out>, o=<optimized out>, ctxt=<optimized out>) at qml/qdeclarativeobjectscriptclass.cpp:917
#84 0x00007f68625b60b3 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#85 0x00007f68624b21d0 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#86 0x00007f686248f2c6 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#87 0x00007f68492f443b in ?? ()
#88 0x0000000000000000 in ?? ()