Application: plasma-desktop (4.11.14)
KDE Platform Version: 4.14.7
Qt Version: 4.8.6
Operating System: Linux 4.0.4-101.fc20.i686+PAE i686
Distribution: "Fedora release 20 (Heisenbug)"

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

After experiencing very slow KDE, I choose to run bleachbit, and closed down thunderbird after having started bleachbit.

- Unusual behavior I noticed:

Before the errror, KDE hanged/was very slow.
KDE crashed after actions described above.

- Custom settings of the application:

Done some mods to run firefox better with a lot of tabs and windows

core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 63815
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 4192
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 2048
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

-- Backtrace:
Application: Plasma skrivbordskal (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0xb771f840 (LWP 2629))]

Thread 3 (Thread 0xaa83db40 (LWP 2630)):
#0  0xb7783cb0 in __kernel_vsyscall ()
#1  0x4a68476c in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S:187
#2  0x41f6c762 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=this@entry=0x4206b500 <QTWTF::pageheap_memory>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#3  0x41f6c7b0 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=0x4206b500 <QTWTF::pageheap_memory>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#4  0x4a680d4c in start_thread (arg=0xaa83db40) at pthread_create.c:309
#5  0x4a56074e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:129

Thread 2 (Thread 0xa6fbfb40 (LWP 2635)):
#0  0xb7783cb0 in __kernel_vsyscall ()
#1  0x4a54e41b in read () at ../sysdeps/unix/syscall-template.S:81
#2  0x42560a9c in ?? () from /lib/tls/libnvidia-tls.so.361.45.11
#3  0x4a819106 in read (__nbytes=16, __buf=0xa6fbefac, __fd=<optimized out>) at /usr/include/bits/unistd.h:44
#4  g_wakeup_acknowledge (wakeup=0x9bbdbe0) at gwakeup.c:212
#5  0x4a7d434b in g_main_context_check (context=context@entry=0xa66004f8, max_priority=2147483647, fds=fds@entry=0xa6602298, n_fds=n_fds@entry=1) at gmain.c:3514
#6  0x4a7d4822 in g_main_context_iterate (context=context@entry=0xa66004f8, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3710
#7  0x4a7d49e9 in g_main_context_iteration (context=0xa66004f8, may_block=1) at gmain.c:3774
#8  0x4b642d9f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#9  0x4b60fa90 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#10 0x4b60fe21 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#11 0x4b4f10d5 in QThread::exec() () from /lib/libQtCore.so.4
#12 0x4b5ee931 in QInotifyFileSystemWatcherEngine::run() () from /lib/libQtCore.so.4
#13 0x4b4f3bdb in QThreadPrivate::start(void*) () from /lib/libQtCore.so.4
#14 0x4a680d4c in start_thread (arg=0xa6fbfb40) at pthread_create.c:309
#15 0x4a56074e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:129

Thread 1 (Thread 0xb771f840 (LWP 2629)):
[KCrash Handler]
#7  0xaaa1bd11 in TaskManager::TasksModel::rowCount (this=0x9fc2c00, parent=...) at /usr/src/debug/kde-workspace-4.11.18/libs/taskmanager/tasksmodel.cpp:329
#8  0x42276399 in modelCount (this=<optimized out>) at graphicsitems/qdeclarativevisualitemmodel.cpp:381
#9  QDeclarativeVisualDataModel::count (this=0xa094ad8) at graphicsitems/qdeclarativevisualitemmodel.cpp:950
#10 0x4227c84d in QDeclarativeVisualDataModel::_q_layoutChanged (this=this@entry=0xa094ad8) at graphicsitems/qdeclarativevisualitemmodel.cpp:1398
#11 0x423d0798 in QDeclarativeVisualDataModel::qt_static_metacall (_o=0xa094ad8, _c=QMetaObject::InvokeMetaMethod, _id=11, _a=0xbfe46804) at .moc/release-shared/moc_qdeclarativevisualitemmodel_p.cpp:406
#12 0x4b626f85 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib/libQtCore.so.4
#13 0x4b679816 in QAbstractItemModel::layoutChanged() () from /lib/libQtCore.so.4
#14 0x4b6096df in QAbstractItemModel::endMoveRows() () from /lib/libQtCore.so.4
#15 0xaaa1d3ad in itemMoved (item=<optimized out>, this=<optimized out>) at /usr/src/debug/kde-workspace-4.11.18/libs/taskmanager/tasksmodel.cpp:524
#16 TaskManager::TasksModel::qt_static_metacall (_o=<optimized out>, _id=<optimized out>, _a=0xbfe46a24, _c=<optimized out>) at /usr/src/debug/kde-workspace-4.11.18/i686-redhat-linux-gnu/libs/taskmanager/tasksmodel.moc:135
#17 0x4b626f85 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib/libQtCore.so.4
#18 0xaaa0e7ba in TaskManager::TaskGroup::itemPositionChanged (this=this@entry=0x9fc5370, _t1=_t1@entry=0xb281468) at /usr/src/debug/kde-workspace-4.11.18/i686-redhat-linux-gnu/libs/taskmanager/taskgroup.moc:220
#19 0xaaa11945 in TaskManager::TaskGroup::moveItem (this=0x9fc5370, oldIndex=oldIndex@entry=4, newIndex=newIndex@entry=8) at /usr/src/debug/kde-workspace-4.11.18/libs/taskmanager/taskgroup.cpp:707
#20 0xaa9ecc52 in TaskManager::AbstractSortingStrategy::check (this=this@entry=0xa0a6320, itemToCheck=itemToCheck@entry=0xb281468) at /usr/src/debug/kde-workspace-4.11.18/libs/taskmanager/abstractsortingstrategy.cpp:148
#21 0xaa9ecde0 in TaskManager::AbstractSortingStrategy::handleItem (this=0xa0a6320, item=0xb281468) at /usr/src/debug/kde-workspace-4.11.18/libs/taskmanager/abstractsortingstrategy.cpp:113
#22 0xaa9eff49 in TaskManager::GroupManagerPrivate::addTask (this=this@entry=0x9f397c0, task=task@entry=0xb1f3550) at /usr/src/debug/kde-workspace-4.11.18/libs/taskmanager/groupmanager.cpp:360
#23 0xaa9f0a0c in TaskManager::GroupManagerPrivate::taskChanged (this=0x9f397c0, task=0xb1f3550, changes=...) at /usr/src/debug/kde-workspace-4.11.18/libs/taskmanager/groupmanager.cpp:589
#24 0xaa9f4385 in TaskManager::GroupManager::qt_static_metacall (_o=<optimized out>, _id=<optimized out>, _a=0xbfe46cc0, _c=<optimized out>) at /usr/src/debug/kde-workspace-4.11.18/i686-redhat-linux-gnu/libs/taskmanager/groupmanager.moc:86
#25 0x4b626f85 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib/libQtCore.so.4
#26 0xaaa17c92 in TaskManager::TaskManager::windowChanged (this=this@entry=0x9f38ee8, _t1=0xb1f3550, _t2=...) at /usr/src/debug/kde-workspace-4.11.18/i686-redhat-linux-gnu/libs/taskmanager/taskmanager.moc:228
#27 0xaaa17ec5 in TaskManager::TaskManager::taskChanged (this=0x9f38ee8, changes=...) at /usr/src/debug/kde-workspace-4.11.18/libs/taskmanager/taskmanager.cpp:387
#28 0xaaa1a579 in TaskManager::TaskManager::qt_static_metacall (_o=<optimized out>, _id=<optimized out>, _a=0xbfe46e44, _c=<optimized out>) at /usr/src/debug/kde-workspace-4.11.18/i686-redhat-linux-gnu/libs/taskmanager/taskmanager.moc:110
#29 0x4b626f85 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib/libQtCore.so.4
#30 0xaaa042e2 in TaskManager::Task::changed (this=this@entry=0xb1f3550, _t1=...) at /usr/src/debug/kde-workspace-4.11.18/i686-redhat-linux-gnu/libs/taskmanager/task.moc:238
#31 0xaaa234fe in TaskManager::Task::addTransient (this=this@entry=0xb1f3550, w=w@entry=165675026, info=...) at /usr/src/debug/kde-workspace-4.11.18/libs/taskmanager/task_x11.cpp:55
#32 0xaaa18b75 in TaskManager::TaskManager::windowAdded (this=0x9f38ee8, w=165675026) at /usr/src/debug/kde-workspace-4.11.18/libs/taskmanager/taskmanager.cpp:258
#33 0xaaa1a5e9 in TaskManager::TaskManager::qt_static_metacall (_o=<optimized out>, _id=<optimized out>, _a=0xbfe47034, _c=<optimized out>) at /usr/src/debug/kde-workspace-4.11.18/i686-redhat-linux-gnu/libs/taskmanager/taskmanager.moc:102
#34 0x4b626f85 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /lib/libQtCore.so.4
#35 0x4f391992 in KWindowSystem::windowAdded (this=0x9c9c588, _t1=165675026) at /usr/src/debug/kdelibs-4.14.7/i686-redhat-linux-gnu/kdeui/kwindowsystem.moc:142
#36 0x4f393513 in KWindowSystemPrivate::addClient (this=0x9d40f60, w=165675026) at /usr/src/debug/kdelibs-4.14.7/kdeui/windowmanagement/kwindowsystem_x11.cpp:287
#37 0x4f3a3da7 in NETRootInfo::update (this=0x9d40f74, dirty_props=dirty_props@entry=0xbfe471a8) at /usr/src/debug/kdelibs-4.14.7/kdeui/windowmanagement/netwm.cpp:2227
#38 0x4f3a4e55 in NETRootInfo::event (this=this@entry=0x9d40f74, event=event@entry=0xbfe4731c, properties=properties@entry=0xbfe47218, properties_size=properties_size@entry=5) at /usr/src/debug/kdelibs-4.14.7/kdeui/windowmanagement/netwm.cpp:2099
#39 0x4f39311f in KWindowSystemPrivate::x11Event (this=0x9d40f60, ev=0xbfe4731c) at /usr/src/debug/kdelibs-4.14.7/kdeui/windowmanagement/kwindowsystem_x11.cpp:190
#40 0x4f260d46 in publicX11Event (e=0xbfe4731c, this=<optimized out>) at /usr/src/debug/kdelibs-4.14.7/kdeui/kernel/ksystemeventfilter.cpp:43
#41 KSystemEventFilterPrivate::filterEvent (this=0x9c6eba0, message=message@entry=0xbfe4731c) at /usr/src/debug/kdelibs-4.14.7/kdeui/kernel/ksystemeventfilter.cpp:102
#42 0x4f260dd1 in _k_eventFilter (message=0xbfe4731c) at /usr/src/debug/kdelibs-4.14.7/kdeui/kernel/ksystemeventfilter.cpp:91
#43 0x4b60210f in QAbstractEventDispatcher::filterEvent(void*) () from /lib/libQtCore.so.4
#44 0x4e4dd083 in x11EventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib/libQtGui.so.4
#45 0x4a7d4556 in g_main_dispatch (context=0x9c6b110) at gmain.c:3066
#46 g_main_context_dispatch (context=context@entry=0x9c6b110) at gmain.c:3642
#47 0x4a7d4920 in g_main_context_iterate (context=context@entry=0x9c6b110, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3713
#48 0x4a7d49e9 in g_main_context_iteration (context=0x9c6b110, may_block=1) at gmain.c:3774
#49 0x4b642d74 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#50 0x4e4dd25c in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtGui.so.4
#51 0x4b60fa90 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#52 0x4b60fe21 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#53 0x4b615c4b in QCoreApplication::exec() () from /lib/libQtCore.so.4
#54 0x4e424ea5 in QApplication::exec() () from /lib/libQtGui.so.4
#55 0x410cad6b in kdemain () from /lib/libkdeinit4_plasma-desktop.so
#56 0x0804878c in main (argc=1, argv=0xbfe47784) at /usr/src/debug/kde-workspace-4.11.18/i686-redhat-linux-gnu/plasma/desktop/shell/plasma-desktop_dummy.cpp:3

Reported using DrKonqi