Application: plasma-desktop (4.11.11)
KDE Platform Version: 4.14.2
Qt Version: 4.8.6
Operating System: Linux 4.1.0-custom x86_64
Distribution: Linux Mint 17.2 Rafaela

-- Information about the crash:
I logged in after ctrl-alt-l to lock my pc

The crash can be reproduced sometimes.

-- Backtrace:
Application: Shell del desktop di 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 0x7f0f4d0d0800 (LWP 5447))]

Thread 5 (Thread 0x7f0f20fe9700 (LWP 5448)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f0f45d93ffb in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f0f45d94039 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f0f4090a182 in start_thread (arg=0x7f0f20fe9700) at pthread_create.c:312
#4  0x00007f0f4c9d547d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 4 (Thread 0x7f0e92a77700 (LWP 5451)):
#0  0x00007f0f4021e397 in g_thread_self () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f0f401f90dd in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f0f495a97be in QEventDispatcherGlib::processEvents (this=0x7f0e8c0008e0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#3  0x00007f0f4957b0af in QEventLoop::processEvents (this=this@entry=0x7f0e92a76da0, flags=...) at kernel/qeventloop.cpp:149
#4  0x00007f0f4957b3a5 in QEventLoop::exec (this=this@entry=0x7f0e92a76da0, flags=...) at kernel/qeventloop.cpp:204
#5  0x00007f0f49477c5f in QThread::exec (this=this@entry=0x1f76f20) at thread/qthread.cpp:537
#6  0x00007f0f4955c823 in QInotifyFileSystemWatcherEngine::run (this=0x1f76f20) at io/qfilesystemwatcher_inotify.cpp:265
#7  0x00007f0f4947a32f in QThreadPrivate::start (arg=0x1f76f20) at thread/qthread_unix.cpp:349
#8  0x00007f0f4090a182 in start_thread (arg=0x7f0e92a77700) at pthread_create.c:312
#9  0x00007f0f4c9d547d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7f0e90879700 (LWP 5453)):
#0  0x00007f0f4c9c812d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f0f401f8fe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f0f401f930a in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f0e91375336 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f0f4021df05 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f0f4090a182 in start_thread (arg=0x7f0e90879700) at pthread_create.c:312
#6  0x00007f0f4c9d547d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7f0e83987700 (LWP 5454)):
#0  0x00007f0f4c9c812d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f0f401f8fe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f0f401f90ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f0f495a97be in QEventDispatcherGlib::processEvents (this=0x7f0e7c0008e0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#4  0x00007f0f4957b0af in QEventLoop::processEvents (this=this@entry=0x7f0e83986da0, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f0f4957b3a5 in QEventLoop::exec (this=this@entry=0x7f0e83986da0, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f0f49477c5f in QThread::exec (this=this@entry=0x2140db0) at thread/qthread.cpp:537
#7  0x00007f0f4955c823 in QInotifyFileSystemWatcherEngine::run (this=0x2140db0) at io/qfilesystemwatcher_inotify.cpp:265
#8  0x00007f0f4947a32f in QThreadPrivate::start (arg=0x2140db0) at thread/qthread_unix.cpp:349
#9  0x00007f0f4090a182 in start_thread (arg=0x7f0e83987700) at pthread_create.c:312
#10 0x00007f0f4c9d547d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f0f4d0d0800 (LWP 5447)):
[KCrash Handler]
#6  QString (other=..., this=0x7ffece9a72b0) at ../../include/QtCore/../../src/corelib/tools/qstring.h:725
#7  v_construct<QString> (t=..., x=0x7ffece9a72b0) at ../../include/QtCore/private/../../../src/corelib/kernel/qvariant_p.h:130
#8  QVariant::QVariant (this=0x7ffece9a72b0, val=...) at kernel/qvariant.cpp:1709
#9  0x00007f0e7bae7128 in SolidDeviceEngine::populateDeviceData (this=this@entry=0x1995790, name=...) at ../../../../../plasma/generic/dataengines/soliddevice/soliddeviceengine.cpp:460
#10 0x00007f0e7bae8d24 in SolidDeviceEngine::sourceRequestEvent (this=0x1995790, name=...) at ../../../../../plasma/generic/dataengines/soliddevice/soliddeviceengine.cpp:94
#11 0x00007f0f4c4f3d8d in Plasma::DataEnginePrivate::requestSource (this=0x23618f0, sourceName=..., newSource=newSource@entry=0x7ffece9a74ef) at ../../plasma/dataengine.cpp:707
#12 0x00007f0f4c4f3e45 in Plasma::DataEngine::connectSource (this=0x1995790, source=..., visualization=visualization@entry=0x2777fa0, pollingInterval=0, intervalAlignment=intervalAlignment@entry=Plasma::NoAlignment) at ../../plasma/dataengine.cpp:95
#13 0x00007f0f20064e76 in Plasma::DataSource::setConnectedSources (this=this@entry=0x2777fa0, sources=...) at ../../../../plasma/declarativeimports/core/datasource.cpp:49
#14 0x00007f0f20065c6a in Plasma::DataSource::qt_metacall (this=0x2777fa0, _c=QMetaObject::WriteProperty, _id=4, _a=0x7ffece9a7770) at ./datasource.moc:179
#15 0x00007f0f4b1cdcd9 in QDeclarativeVMEMetaObject::metaCall (this=0x2755e00, c=QMetaObject::WriteProperty, _id=5, a=0x7ffece9a7770) at qml/qdeclarativevmemetaobject.cpp:673
#16 0x00007f0f4b1e995c in QDeclarativePropertyPrivate::write (object=0x2777fa0, property=..., value=..., context=<optimized out>, flags=...) at qml/qdeclarativeproperty.cpp:1239
#17 0x00007f0f4b1ea45c in QDeclarativePropertyPrivate::writeValueProperty (this=0x27b1cf0, value=..., flags=...) at qml/qdeclarativeproperty.cpp:1088
#18 0x00007f0f4b1ea512 in QDeclarativePropertyPrivate::write (that=..., value=..., flags=...) at qml/qdeclarativeproperty.cpp:1343
#19 0x00007f0f4b1e4277 in QDeclarativeBinding::update (this=0x24531b0, flags=...) at qml/qdeclarativebinding.cpp:427
#20 0x00007f0f4b1e30db in update (this=<optimized out>) at ../../include/QtDeclarative/private/../../../src/declarative/qml/qdeclarativebinding_p.h:208
#21 QDeclarativeBindingPrivate::emitValueChanged (this=<optimized out>) at qml/qdeclarativebinding.cpp:469
#22 0x00007f0f4b1e2e63 in QDeclarativeExpression::qt_metacall (this=this@entry=0x24531b0, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=1, _a=0x7ffece9a7b60) at .moc/release-shared/moc_qdeclarativeexpression.cpp:93
#23 0x00007f0f4b2d9fd0 in QDeclarativeBinding::qt_metacall (this=0x24531b0, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=<optimized out>) at .moc/release-shared/moc_qdeclarativebinding_p.cpp:85
#24 0x00007f0f49590a78 in QMetaObject::activate (sender=0x23e0d70, m=m@entry=0x7f0f2027dde0 <Plasma::DataSource::staticMetaObject>, local_signal_index=local_signal_index@entry=9, argv=argv@entry=0x0) at kernel/qobject.cpp:3569
#25 0x00007f0f200659e3 in sourcesChanged (this=<optimized out>) at ./datasource.moc:261
#26 Plasma::DataSource::qt_static_metacall (_o=<optimized out>, _id=<optimized out>, _a=<optimized out>, _c=<optimized out>) at ./datasource.moc:109
#27 0x00007f0f49594c1e in QObject::event (this=0x23e0d70, e=<optimized out>) at kernel/qobject.cpp:1194
#28 0x00007f0f48915e2c in QApplicationPrivate::notify_helper (this=this@entry=0x140b000, receiver=receiver@entry=0x23e0d70, e=e@entry=0x386bbc0) at kernel/qapplication.cpp:4567
#29 0x00007f0f4891c4a0 in QApplication::notify (this=this@entry=0x14063e0, receiver=receiver@entry=0x23e0d70, e=e@entry=0x386bbc0) at kernel/qapplication.cpp:4353
#30 0x00007f0f4a241cca in KApplication::notify (this=0x14063e0, receiver=0x23e0d70, event=0x386bbc0) at ../../kdeui/kernel/kapplication.cpp:311
#31 0x00007f0f4957c4dd in QCoreApplication::notifyInternal (this=0x14063e0, receiver=receiver@entry=0x23e0d70, event=event@entry=0x386bbc0) at kernel/qcoreapplication.cpp:953
#32 0x00007f0f4957fb3d in sendEvent (event=0x386bbc0, receiver=0x23e0d70) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#33 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x137ef40) at kernel/qcoreapplication.cpp:1577
#34 0x00007f0f4957ffe3 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1470
#35 0x00007f0f495a9f83 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#36 postEventSourceDispatch (s=0x140d250) at kernel/qeventdispatcher_glib.cpp:287
#37 0x00007f0f401f8e04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#38 0x00007f0f401f9048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#39 0x00007f0f401f90ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#40 0x00007f0f495a97a1 in QEventDispatcherGlib::processEvents (this=0x1380840, flags=...) at kernel/qeventdispatcher_glib.cpp:434
#41 0x00007f0f489b7be6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#42 0x00007f0f4957b0af in QEventLoop::processEvents (this=this@entry=0x7ffece9a8210, flags=...) at kernel/qeventloop.cpp:149
#43 0x00007f0f4957b3a5 in QEventLoop::exec (this=this@entry=0x7ffece9a8210, flags=...) at kernel/qeventloop.cpp:204
#44 0x00007f0f49580b79 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#45 0x00007f0f4891437c in QApplication::exec () at kernel/qapplication.cpp:3828
#46 0x00007f0f4ccdc67c in kdemain (argc=1, argv=0x7ffece9a8468) at ../../../../plasma/desktop/shell/main.cpp:126
#47 0x00007f0f4c8fcec5 in __libc_start_main (main=0x4006e0 <main(int, char**)>, argc=1, argv=0x7ffece9a8468, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffece9a8458) at libc-start.c:287
#48 0x000000000040070e in _start ()

Possible duplicates by query: bug 230987.

Reported using DrKonqi