Application: plasma-desktop (4.11.12)
KDE Platform Version: 4.14.2
Qt Version: 4.8.6
Operating System: Linux 3.16.0-29-generic x86_64
Distribution: Ubuntu 14.10

-- Information about the crash:
- What I was doing when the application crashed:

Running a flash video (that uses HAL for DRM) in Firefox browser; switched over to steam to close it and on exit the desktop crashed. 

- Unusual behavior I noticed:

Application bar closed, Redshift stopped.

-- Backtrace:
Application: Plasma Desktop 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 0x7f335447c8c0 (LWP 3202))]

Thread 7 (Thread 0x7f33292ea700 (LWP 3203)):
#0  0x00007f3347c6c250 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007f334d106c8a in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f334d106cb9 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f3347c680a5 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007f3353d6ecfd in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 6 (Thread 0x7f329e75a700 (LWP 3209)):
#0  0x00007fff36dfcbe7 in clock_gettime ()
#1  0x00007f3353d7d01d in clock_gettime () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007f335085e865 in do_gettime (frac=<synthetic pointer>, sec=<synthetic pointer>) at tools/qelapsedtimer_unix.cpp:127
#3  qt_gettime () at tools/qelapsedtimer_unix.cpp:144
#4  0x00007f3350938d95 in updateCurrentTime (this=0x7f3298002ee0) at kernel/qeventdispatcher_unix.cpp:354
#5  QTimerInfoList::timerWait (this=0x7f3298002ee0, tm=...) at kernel/qeventdispatcher_unix.cpp:460
#6  0x00007f335093779c in timerSourcePrepareHelper (src=<optimized out>, timeout=0x7f329e759b14) at kernel/qeventdispatcher_glib.cpp:143
#7  0x00007f3350937845 in timerSourcePrepare (source=<optimized out>, timeout=<optimized out>) at kernel/qeventdispatcher_glib.cpp:176
#8  0x00007f334754d46d in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007f334754de0b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f334754dffc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f335093804e in QEventDispatcherGlib::processEvents (this=0x7f32980008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#12 0x00007f33509094f1 in QEventLoop::processEvents (this=this@entry=0x7f329e759ce0, flags=...) at kernel/qeventloop.cpp:149
#13 0x00007f3350909805 in QEventLoop::exec (this=this@entry=0x7f329e759ce0, flags=...) at kernel/qeventloop.cpp:204
#14 0x00007f3350807c39 in QThread::exec (this=this@entry=0x20dbde0) at thread/qthread.cpp:538
#15 0x00007f33508eb033 in QInotifyFileSystemWatcherEngine::run (this=0x20dbde0) at io/qfilesystemwatcher_inotify.cpp:265
#16 0x00007f335080a39f in QThreadPrivate::start (arg=0x20dbde0) at thread/qthread_unix.cpp:349
#17 0x00007f3347c680a5 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#18 0x00007f3353d6ecfd in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 5 (Thread 0x7f333203f700 (LWP 6891)):
#0  0x00007f3347c6c250 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007f335080a894 in wait (time=18446744073709551615, this=0x229d010) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x22936f0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f334c372e6c in ?? () from /usr/lib/libthreadweaver.so.4
#4  0x00007f334c375903 in ?? () from /usr/lib/libthreadweaver.so.4
#5  0x00007f334c37591c in ?? () from /usr/lib/libthreadweaver.so.4
#6  0x00007f334c37461f in ThreadWeaver::Thread::run() () from /usr/lib/libthreadweaver.so.4
#7  0x00007f335080a39f in QThreadPrivate::start (arg=0x160f330) at thread/qthread_unix.cpp:349
#8  0x00007f3347c680a5 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#9  0x00007f3353d6ecfd in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 4 (Thread 0x7f3330a98700 (LWP 6892)):
#0  0x00007f3347c6c250 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007f335080a894 in wait (time=18446744073709551615, this=0x229d010) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x22936f0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f334c372e6c in ?? () from /usr/lib/libthreadweaver.so.4
#4  0x00007f334c375903 in ?? () from /usr/lib/libthreadweaver.so.4
#5  0x00007f334c37461f in ThreadWeaver::Thread::run() () from /usr/lib/libthreadweaver.so.4
#6  0x00007f335080a39f in QThreadPrivate::start (arg=0x382de70) at thread/qthread_unix.cpp:349
#7  0x00007f3347c680a5 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#8  0x00007f3353d6ecfd in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 3 (Thread 0x7f332e91d700 (LWP 6893)):
#0  0x00007f3347c6c250 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007f335080a894 in wait (time=18446744073709551615, this=0x229d010) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x22936f0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f334c372e6c in ?? () from /usr/lib/libthreadweaver.so.4
#4  0x00007f334c375903 in ?? () from /usr/lib/libthreadweaver.so.4
#5  0x00007f334c37461f in ThreadWeaver::Thread::run() () from /usr/lib/libthreadweaver.so.4
#6  0x00007f335080a39f in QThreadPrivate::start (arg=0x1982820) at thread/qthread_unix.cpp:349
#7  0x00007f3347c680a5 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#8  0x00007f3353d6ecfd in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 2 (Thread 0x7f332e11c700 (LWP 6894)):
#0  0x00007f3347c6c250 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007f335080a894 in wait (time=18446744073709551615, this=0x229d010) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x22936f0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f334c372e6c in ?? () from /usr/lib/libthreadweaver.so.4
#4  0x00007f334c375903 in ?? () from /usr/lib/libthreadweaver.so.4
#5  0x00007f334c37461f in ThreadWeaver::Thread::run() () from /usr/lib/libthreadweaver.so.4
#6  0x00007f335080a39f in QThreadPrivate::start (arg=0x4a413b0) at thread/qthread_unix.cpp:349
#7  0x00007f3347c680a5 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#8  0x00007f3353d6ecfd in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 1 (Thread 0x7f335447c8c0 (LWP 3202)):
[KCrash Handler]
#5  QReadWriteLock::~QReadWriteLock (this=0x25, __in_chrg=<optimized out>) at thread/qreadwritelock.cpp:137
#6  0x00007f33538f5e3d in Plasma::QueryMatch::~QueryMatch() () from /usr/lib/libplasma.so.3
#7  0x00007f335390551f in Plasma::RunnerManager::run(QString const&) () from /usr/lib/libplasma.so.3
#8  0x00007f332cb3b20f in Kickoff::KRunnerItemHandler::openUrl(KUrl const&) () from /usr/lib/libkickoff.so
#9  0x00007f332cb3fe65 in ?? () from /usr/lib/libkickoff.so
#10 0x00007f332cb3ed30 in Kickoff::UrlItemLauncher::openItem(QModelIndex const&) () from /usr/lib/libkickoff.so
#11 0x00007f332cd76c67 in ?? () from /usr/lib/kde4/plasma_applet_launcher.so
#12 0x00007f335090a9d6 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x138f420, receiver=receiver@entry=0x22475f0, event=event@entry=0x7fff36d6d570) at kernel/qcoreapplication.cpp:1063
#13 0x00007f334fc970fc in QApplicationPrivate::notify_helper (this=this@entry=0x138f420, receiver=receiver@entry=0x22475f0, e=e@entry=0x7fff36d6d570) at kernel/qapplication.cpp:4566
#14 0x00007f334fc9d9be in QApplication::notify (this=<optimized out>, receiver=0x22475f0, e=0x7fff36d6d570) at kernel/qapplication.cpp:4113
#15 0x00007f33515d0cca in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#16 0x00007f335090a86d in QCoreApplication::notifyInternal (this=0x138ab40, receiver=receiver@entry=0x22475f0, event=event@entry=0x7fff36d6d570) at kernel/qcoreapplication.cpp:953
#17 0x00007f334fc9d07f in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#18 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x22475f0, event=event@entry=0x7fff36d6d570, alienWidget=alienWidget@entry=0x22475f0, nativeWidget=nativeWidget@entry=0x23557a0, buttonDown=buttonDown@entry=0x7f335078b578 <qt_button_down>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3178
#19 0x00007f334fd12bde in QETWidget::translateMouseEvent (this=this@entry=0x23557a0, event=event@entry=0x7fff36d6d8d0) at kernel/qapplication_x11.cpp:4634
#20 0x00007f334fd12477 in QApplication::x11ProcessEvent (this=0x138ab40, event=event@entry=0x7fff36d6d8d0) at kernel/qapplication_x11.cpp:3627
#21 0x00007f334fd3a432 in x11EventSourceDispatch (s=0x138fa80, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#22 0x00007f334754dc5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f334754df48 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f334754dffc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f335093804e in QEventDispatcherGlib::processEvents (this=0x130c830, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#26 0x00007f334fd3a4e6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#27 0x00007f33509094f1 in QEventLoop::processEvents (this=this@entry=0x7fff36d6dcb0, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007f3350909805 in QEventLoop::exec (this=this@entry=0x7fff36d6dcb0, flags=...) at kernel/qeventloop.cpp:204
#29 0x00007f335090ef67 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#30 0x00007f335407946d in kdemain () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#31 0x00007f3353c96ec5 in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
#32 0x000000000040070e in _start ()

Reported using DrKonqi