Application: plasma-desktop (0.4)
KDE Platform Version: 4.6.1 (4.6.1)
Qt Version: 4.7.1
Operating System: Linux 2.6.35.12-88.fc14.x86_64 x86_64
Distribution: "Fedora release 14 (Laughlin)"

-- Information about the crash:
I used "Okular" and i changed workspace. Desktop 2times blink and then crashed

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
82	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
[Current thread is 1 (Thread 0x7f1e1661b860 (LWP 2171))]

Thread 5 (Thread 0x7f1df3f8e700 (LWP 3881)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x0000003cb7e72ddb in wait (this=<value optimized out>, mutex=0x187d7e0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x187d7e0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x0000003ccc60a0b4 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x18ea9f0, th=0x2156530) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x0000003ccc60c743 in ThreadWeaver::WorkingHardState::applyForWork (this=0x18763d0, th=0x2156530) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x0000003ccc60b52f in ThreadWeaver::ThreadRunHelper::run (this=0x7f1df3f8dd30, parent=0x18ea9f0, th=0x2156530) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/Thread.cpp:87
#6  0x0000003ccc60b5b8 in ThreadWeaver::Thread::run (this=0x2156530) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/Thread.cpp:142
#7  0x0000003cb7e726ee in QThreadPrivate::start (arg=0x2156530) at thread/qthread_unix.cpp:285
#8  0x0000003caea06ccb in start_thread (arg=0x7f1df3f8e700) at pthread_create.c:301
#9  0x0000003cadee0c2d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115

Thread 4 (Thread 0x7f1e01545700 (LWP 3882)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x0000003cb7e72ddb in wait (this=<value optimized out>, mutex=0x187d7e0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x187d7e0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x0000003ccc60a0b4 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x18ea9f0, th=0x1ecd5a0) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x0000003ccc60c743 in ThreadWeaver::WorkingHardState::applyForWork (this=0x18763d0, th=0x1ecd5a0) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x0000003ccc60c75c in ThreadWeaver::WorkingHardState::applyForWork (this=0x18763d0, th=0x1ecd5a0) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x0000003ccc60b52f in ThreadWeaver::ThreadRunHelper::run (this=0x7f1e01544d30, parent=0x18ea9f0, th=0x1ecd5a0) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/Thread.cpp:87
#7  0x0000003ccc60b5b8 in ThreadWeaver::Thread::run (this=0x1ecd5a0) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/Thread.cpp:142
#8  0x0000003cb7e726ee in QThreadPrivate::start (arg=0x1ecd5a0) at thread/qthread_unix.cpp:285
#9  0x0000003caea06ccb in start_thread (arg=0x7f1e01545700) at pthread_create.c:301
#10 0x0000003cadee0c2d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115

Thread 3 (Thread 0x7f1df2942700 (LWP 3883)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x0000003cb7e72ddb in wait (this=<value optimized out>, mutex=0x187d7e0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x187d7e0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x0000003ccc60a0b4 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x18ea9f0, th=0x20400d0) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x0000003ccc60c743 in ThreadWeaver::WorkingHardState::applyForWork (this=0x18763d0, th=0x20400d0) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x0000003ccc60c75c in ThreadWeaver::WorkingHardState::applyForWork (this=0x18763d0, th=0x20400d0) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x0000003ccc60b52f in ThreadWeaver::ThreadRunHelper::run (this=0x7f1df2941d30, parent=0x18ea9f0, th=0x20400d0) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/Thread.cpp:87
#7  0x0000003ccc60b5b8 in ThreadWeaver::Thread::run (this=0x20400d0) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/Thread.cpp:142
#8  0x0000003cb7e726ee in QThreadPrivate::start (arg=0x20400d0) at thread/qthread_unix.cpp:285
#9  0x0000003caea06ccb in start_thread (arg=0x7f1df2942700) at pthread_create.c:301
#10 0x0000003cadee0c2d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115

Thread 2 (Thread 0x7f1df0bbe700 (LWP 3884)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x0000003cb7e72ddb in wait (this=<value optimized out>, mutex=0x187d7e0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<value optimized out>, mutex=0x187d7e0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x0000003ccc60a0b4 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x18ea9f0, th=0x1fb4400) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x0000003ccc60c743 in ThreadWeaver::WorkingHardState::applyForWork (this=0x18763d0, th=0x1fb4400) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x0000003ccc60b52f in ThreadWeaver::ThreadRunHelper::run (this=0x7f1df0bbdd30, parent=0x18ea9f0, th=0x1fb4400) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/Thread.cpp:87
#6  0x0000003ccc60b5b8 in ThreadWeaver::Thread::run (this=0x1fb4400) at /usr/src/debug/kdelibs-4.6.1/threadweaver/Weaver/Thread.cpp:142
#7  0x0000003cb7e726ee in QThreadPrivate::start (arg=0x1fb4400) at thread/qthread_unix.cpp:285
#8  0x0000003caea06ccb in start_thread (arg=0x7f1df0bbe700) at pthread_create.c:301
#9  0x0000003cadee0c2d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115

Thread 1 (Thread 0x7f1e1661b860 (LWP 2171)):
[KCrash Handler]
#6  0x00007f1e08b21477 in TaskItemLayout::layoutItems (this=0x1268690) at /usr/src/debug/kdebase-workspace-4.6.1/plasma/desktop/applets/tasks/taskitemlayout.cpp:347
#7  0x00007f1e08b219c8 in TaskItemLayout::remove (this=0x1268690, item=0x24a5b90) at /usr/src/debug/kdebase-workspace-4.6.1/plasma/desktop/applets/tasks/taskitemlayout.cpp:163
#8  0x00007f1e08b21aee in TaskItemLayout::removeTaskItem (this=0x1268690, item=0x24a5b90) at /usr/src/debug/kdebase-workspace-4.6.1/plasma/desktop/applets/tasks/taskitemlayout.cpp:113
#9  0x00007f1e08b2af3b in TaskGroupItem::itemRemoved (this=0x82de80, groupableItem=0x246ad80) at /usr/src/debug/kdebase-workspace-4.6.1/plasma/desktop/applets/tasks/taskgroupitem.cpp:555
#10 0x00007f1e08b2e789 in TaskGroupItem::reload (this=0x82de80) at /usr/src/debug/kdebase-workspace-4.6.1/plasma/desktop/applets/tasks/taskgroupitem.cpp:344
#11 0x00007f1e08b2ea67 in TaskGroupItem::setGroup (this=0x82de80, group=0x1260dc0) at /usr/src/debug/kdebase-workspace-4.6.1/plasma/desktop/applets/tasks/taskgroupitem.cpp:379
#12 0x00007f1e08b1e47c in Tasks::qt_metacall (this=0xa586e0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff750d93b0) at /usr/src/debug/kdebase-workspace-4.6.1/x86_64-redhat-linux-gnu/plasma/desktop/applets/tasks/tasks.moc:99
#13 0x0000003cb7f7004f in QMetaObject::activate (sender=0xa3be70, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3272
#14 0x00007f1e0917d0f3 in TaskManager::GroupManagerPrivate::actuallyReloadTasks (this=0x1265a10) at /usr/src/debug/kdebase-workspace-4.6.1/libs/taskmanager/groupmanager.cpp:191
#15 0x00007f1e0917e541 in TaskManager::GroupManager::qt_metacall (this=0xa3be70, _c=QMetaObject::InvokeMetaMethod, _id=14, _a=0x7fff750d95a0) at /usr/src/debug/kdebase-workspace-4.6.1/x86_64-redhat-linux-gnu/libs/taskmanager/groupmanager.moc:117
#16 0x0000003cb7f7004f in QMetaObject::activate (sender=0x1265a68, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x0) at kernel/qobject.cpp:3272
#17 0x0000003cb7f6f879 in QObject::event (this=0x1265a68, e=<value optimized out>) at kernel/qobject.cpp:1175
#18 0x0000003cbb3b78c4 in QApplicationPrivate::notify_helper (this=0x702900, receiver=0x1265a68, e=0x7fff750d9ce0) at kernel/qapplication.cpp:4445
#19 0x0000003cbb3bc3da in QApplication::notify (this=<value optimized out>, receiver=0x1265a68, e=0x7fff750d9ce0) at kernel/qapplication.cpp:4324
#20 0x0000003cbd640466 in KApplication::notify (this=0x6f3fd0, receiver=0x1265a68, event=0x7fff750d9ce0) at /usr/src/debug/kdelibs-4.6.1/kdeui/kernel/kapplication.cpp:311
#21 0x0000003cb7f5b7ac in QCoreApplication::notifyInternal (this=0x6f3fd0, receiver=0x1265a68, event=0x7fff750d9ce0) at kernel/qcoreapplication.cpp:732
#22 0x0000003cb7f893fe in sendEvent (this=0x709070) at kernel/qcoreapplication.h:215
#23 QTimerInfoList::activateTimers (this=0x709070) at kernel/qeventdispatcher_unix.cpp:603
#24 0x0000003cb7f861d4 in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#25 0x0000003cb0241e33 in g_main_dispatch (context=0x708120) at gmain.c:2149
#26 g_main_context_dispatch (context=0x708120) at gmain.c:2702
#27 0x0000003cb0242610 in g_main_context_iterate (context=0x708120, block=1, dispatch=1, self=<value optimized out>) at gmain.c:2780
#28 0x0000003cb02428ad in g_main_context_iteration (context=0x708120, may_block=1) at gmain.c:2843
#29 0x0000003cb7f868bf in QEventDispatcherGlib::processEvents (this=0x6b0c40, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:415
#30 0x0000003cbb45c59e in QGuiEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:207
#31 0x0000003cb7f5ab42 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#32 0x0000003cb7f5ad8c in QEventLoop::exec (this=0x7fff750d9f70, flags=...) at kernel/qeventloop.cpp:201
#33 0x0000003cb7f5f24b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1009
#34 0x0000003cc1e3ebd8 in kdemain (argc=1, argv=0x7fff750da368) at /usr/src/debug/kdebase-workspace-4.6.1/plasma/desktop/shell/main.cpp:118
#35 0x0000003cade1ee5d in __libc_start_main (main=0x400990 <main(int, char**)>, argc=1, ubp_av=0x7fff750da368, init=<value optimized out>, fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7fff750da358) at libc-start.c:226
#36 0x00000000004008b9 in _start ()

This bug may be a duplicate of or related to bug 268301.

Possible duplicates by query: bug 270133, bug 268301, bug 266726, bug 264079, bug 252383.

Reported using DrKonqi